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WEF Membership Equips Professionals With Tools To Protect Water

Membership in the Water Environment Federation (WEF; Alexandria, Va.) carries many benefits and exclusive perks. Because members help protect and enhance water quality, WEF strives to provide them with access to the knowledge and tools needed for sustainable water resource management, water protection, and water and wastewater treatment.

Benefits include discounts on WEF’s many educational events and various educational products and services, access to technical publications and regulatory updates, unique networking and career-building opportunities, and the ability to join WEF committees and receive WEF awards.

To help members stay updated on advances, trends, and solutions, WEF provides access to such publications as Water Environment & Technology and the WEF Conference Proceedings.

To help facilitate continual learning and help members earn Continuing Education Units (CEUs), Professional Development Hours (PDHs), or contact hours, WEF offers discounts to WEFTECand other conferences, seminars, and workshops. WEF also offers discounts on books and manuals of practice, as well as online courses in the WEF Knowledge Center.

To enhance networking and professional relationships, WEF provides many opportunities to join discussions with other water-sector professionals through such venues as WEFCOM (the WEF member online workspace) and WEF’s LinkedIn page. WEF members also can build leadership skills through participating in WEF committees. Committees develop and discuss ideas and actions in many fields pertaining to water resources, wastewater, and water quality.

To help advance careers, WEF provides members with the opportunity to nominate or to be nominated for awards. A number ofWEF awards, recognizing outstanding contribution to the water environment profession, require nominees to be members. WEF also provides access to the WEF Job Bank.

Because WEF realizes that membership needs vary from one individual or group to the next, it offers a number of different membership categories. Primary membership categories includeProfessional, Professional Wastewater Operator, Young Professional, and Student. WEF’s Utility Partnership Programenables utilities to consolidate all employee members into a single account and choose the appropriate value packages based on employees’ needs. WEF also offers other opportunities for corporate members and international members.

For more information on WEF membership or how to join today, contact Jessica LaFever at or (703) 684-2400 ext. 7052.

Kihei Effluent Reuse


County of Maui Wastewater Reclamation Division Logo

Kihei lies on the dry south side of Maui.  Potable water for the area must be piped over ten miles from water wells drilled into the ‘Iao Aquifer near Wailuku.  Approximately 65 percent of this water is used by the community for irrigation with the remainder ultimately ending up in the sewer system. This wastewater is then treated and disposed at the Kihei Wastewater Reclamation Facility (WWRF).

In the past, the County of Maui has had difficulty finding users for reclaimed water from the Kihei WWRF.  The primary drawback has been the high cost of conveying the treated effluent to individual users.  However, through the collective efforts of surrounding landowners, potential users and the County, an effluent reuse system consisting of storage and transmission facilities was constructed that met the needs for all parties involved. The goal of the project was to establish a reuse system that was compatible with existing activities, providing beneficial uses for the community, minimizing adverse environmental impacts and be economically feasible.




The Kihei WWRF is an activated sludge treatment facility that currently has a peak dry weather capacity of 8.0 million gallons per day (mgd). The facility has undergone major upgrades in its treatment capabilities with the addition of flocculation and chemical feed units, effluent filtration, ultraviolet disinfection, and renovations to the operations building. The plant is capable of producing high quality effluent, designated as R-1 by the Hawai‘i State Department of Health (DOH) Standards. Because R-1 effluent is the highest grade of reclaimed water by DOH standards, it has minimal restrictions for reuse.

The Kihei WWRF currently reclaims between 40 and 50 percent of the wastewater it treats, which is typically between 1.6 and 2.0 million gallons per day. The remaining treated effluent is discharged into injection wells located on the grounds of the WWRF, where it percolates into the ground. It is envisioned that the Kihei WWRF will eventually reclaim 100 percent of its flow as public acceptance and demand for the high quality effluent increases in the future.


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The County of Maui has constructed major elements of the Kihei Effluent Reuse System which includes its storage facilities and a major portion of its transmission and distribution system. These improvements have been installed in two projects: the Kihei Effluent Reuse Core System and the Kihei Effluent Reuse Distribution System, Phase I. The initial project, the Effluent Reuse Core System, qualified as an innovative project for a 100 percent low interest loan from the State Revolving Fund (SRF), administered by the Hawai‘i State DOH.

Kihei Effluent Reuse Core System

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The Kihei Effluent Reuse Core System included modifications of existing facilities at the Kihei WWRF and new improvements.  Major elements at the Kihei WWRF incorporated into the reuse system included the effluent pumping station, equipped with two 1500 gpm pumps, and the 1.8 million gallon (MG) effluent storage basin.  The existing effluent storage basin was rehabilitated and retrofitted with a polypropylene liner and floating membrane cover system to maintain the high quality of the treated effluent produced at the reclamation facility. The membrane liner and cover protect the effluent from debris and contaminants, and reduce the potential for algae growth.

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The new improvements were designed to operate in concert with the existing reclamation facilities, and are capable of functioning under expanded operating conditions as the plant capacity is increased in the future.  New improvements included the construction of an elevated 1.0 MG reinforced concrete reservoir in the hillside above the Kihei WWRF.  The elevated tank allows gravity to pressurize the system, thus eliminated the need for mechanical pumping.  The reservoir is fitted with an aluminum geodesic dome cover that eliminated the need for interior columns and footings within the reservoir, and the resulting cost savings allowed for the installation of a high quality tank lining system.  In addition, an 18-inch ductile iron pipeline was constructed to connect the storage reservoir to the reclamation facility.

The storage and transmission system was also equipped with remote pressure and flow sensors and level controls that communicate with the Kihei WWRF control station. Due to the reservoir’s remote location, level sensors at the tank utilize solar powered radio transmitters to communicate with the WWRF control station, thus eliminating the need for conventional power and communication lines. The telemetry system enables system operation and status checks through the reclamation facility’s Supervisory Control and Data Acquisition (SCADA) System. The SCADA system is programmed to start and stop the effluent pumps and to control valves that permit irrigation of the Elleair Maui Golf Club and the Monsanto Corporation’s seed corn operations.

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The Effluent Reuse Core System was put into operation prior to completion of all construction, so that it could continue to serve Monsanto Corporation’s seed corn operations and the Elleair Maui Golf Club. Cooperation between effluent consumers, the County and the contractor allowed virtually uninterrupted service during the construction period. The total project construction cost for the Kihei Effluent Reuse Core System was $3.2 million. Total project construction time was 12 months with the project substantially completed in April 1998.

Kihei Effluent Distribution System, Phase I

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Community interest in utilizing reclaimed effluent and the surplus funding available from the initial project prompted the County of Maui to extend the effluent distribution capability of the Kihei Effluent Reuse Core System. The Kihei Effluent Distribution System, Phase I was initiated during the construction phase of the Core System. Planning, design and bidding of the project was accomplished prior to the completion of construction for the Effluent Reuse Core Project.  One of the goals of the project was to complete construction of the distribution system before the completion of the Kihei Community Center, allowing the effluent to be used for the establishment of the playfields being constructed at the Center.

The Phase I Distribution System included the extension of the effluent transmission line from the Kihei WWRF in the makai direction across Pi‘ilani Highway, then northward along the proposed North-South Collector Road corridor to the Kihei Community Center site. Approximately 6,200 linear feet of 12-inch, and 1,700 linear feet of 18-inch, ductile iron pipe was installed for this project. The system serves the Kihei Community Center, Kihei Elementary and Lokelani Intermediate Schools, Haggai Institute and the Pi‘ilani Commercial Center.
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The effluent line was also outfitted with fire hydrants to aid firefighters in control of brushfires that frequently occur in the area. Per Hawai‘i State DOH standards, the fire hydrants are painted purple to identify them as part of the reclaimed water system.

The construction cost for the Kihei Effluent Distribution System, Phase I, was $682,000. Total construction time was 8 months, with substantial construction completed in December 1998. The contractor for the project was Goodfellow Brothers, Inc.


The Kihei Effluent Reuse System is the first application in Hawai‘i of an effluent reuse system pressurized by an elevated closed reservoir, making the effluent available to customers on a continuous basis.  Customers can simply connect to the system and use the effluent without the use of booster pumps.  The system has met its goal of providing the County of Maui with a system that is beneficial to the community by preserving its potable water resources, and utilizing reclaimed water for irrigation of parks, landscape areas and a golf course, and for fire protection. The reclaimed water is also used by a major agricultural operation, Monsanto Corporation, for the production of high quality seed corn that is marketed worldwide. The system has proven to be easy to operate and reliable, and has met the needs and expectations of the County.

For more information on the Kihei Effluent Reuse System, contact Steve Parabicoli, Maui County Wastewater Reclamation Coordinator at phone (808) 270-7426 or e-mail:

Honouliuli WRF


BWS LogoThe ‘Ewa district on the island of O‘ahu has undergone a significant amount of development in recent years. What was once fertile agriculture land has now given way to numerous residential, commercial and industrial developments. These developments have seriously impacted the region’s available water resources in two ways: (1) by reducing the amount of recharge that the caprock aquifer receives because of reduced agricultural activity, and (2) increasing the potable water demands placed on O‘ahu’s potable water aquifers.

As more and more land is being developed, the amount of water being applied to the ground in the form of agricultural irrigation is being reduced. This reduction ofgroundwater recharge has markedly reduced the amount of water replenishing the existing aquifer. As a result of this activity, the salinity of the aquifer has been gradually rising as withdrawals from existing wells continue. This has prompted the Hawai‘i State Department of Land and Natural Resources (DLNR) to develop plans to limit new well permits and well permit renewals in the region.Development in the ‘Ewa area includes a number of golf courses that are currently pumping brackish water from the caprock aquifer for irrigation. New residential subdivisions are increasing the demand for potable water in the region, and accelerating the withdrawal of water from potable water aquifers. In addition, industrial activities at the Campbell Industrial Park also place demands on potable water aquifers. This area contains many industrial facilities that consume large amounts of potable water for their industrial processes. Recognizing these demands, the Honolulu Board of Water Supply (BWS) entered into the water recycling business in 2000 by purchasing the Honouliuli Water Recycling Facility.  Water recycling is one element of a broader BWS strategy to protect O‘ahu’s aquifers and to conserve water resources through conservation and development of new water supplies.  The facility is now irrigating golf courses that were once using brackish water, including West Loch,  ‘Ewa Villages, Hawai‘i Prince, and Coral Creek.  The facility is also providing recycled water to industries at Campbell Industrial Park.



The City and County of Honolulu (City) owns and operates the Honouliuli Wastewater Treatment Plant (WWTP), which is the regional wastewater treatment facility for the ‘Ewa district. The Honouliuli WWTP is located along Geiger Road directly east of the former Naval Air Station Barbers Point. The service area of the plant encompasses a total area of approximately 76,000 acres and ranges from Red Hill along its eastern boundary up to Mililani on its northern boundary, and extends to Makakilo City, Honokai Hale, and Ko Olina on its western boundary.
Service Area of Honoluliuli WWTP

All residential, commercial, industrial and agricultural areas within these boundaries are included in the service area except for Pearl Harbor, Campbell Industrial Park and several small pockets that are served by cesspools or septic tanks. Wastewater treated at the Honouliuli WWTP is discharged into West Mamala Bay through a deep ocean outfall.

The Honouliuli WWTP was originally put into service in December 1984. The plant was initially designed to treat up to 25 million gallons per day (mgd) of wastewater to the primary level only. Over the years, the plant capacity has been expanded to meet increasing and expected future flows. The plant presently has a design average dry weather flow capacity of 38 mgd, with future plans to further expand it’s capacity to 51 mgd.

Treatment processes at the Honouliuli WWTP include preliminary treatment, primary treatment, secondary treatment, effluent screening, solids treatment and handling, and odor control.  The preliminary treatment processes include influent screens at the headworks, aerated grit removal, and preaeration facilities.  Primary treatment processes include four circular clarifiers which utilize flotation and sedimentation to remove floating and settleable solids from the wastewater.  The secondary treatment processes at Honouliuli includes two biotowers that are fed by the biotower pump station, a solids contactor and sludge reaeration tank, and two circular secondary clarifiers.  The secondary treatment facilities are currently capable of treating up to 13 mgd.  The effluent screens are located immediately upstream of the ocean outfall pipe, and ensure that no large objects are discharged through the outfall.

The solids treatment and handling processes include thickening, storage/blending, stabilization, dewatering and disposal.  Incineration was originally used at the plant to further reduce the volume of the dewatered sludge before disposal, but was taken offline in 1995 due to public concerns about air quality.  Odor control at the plant consists of four main systems, 1) headworks, 2) central system for the grit removal/preaeration tanks, primary clarifiers, gravity thickeners, blending tanks, 3) secondary treatment system, and 4) solids system.


The secondary treatment facilities at the Honouliuli WWTP were constructed as a result of a State of Hawai‘i Department of Health (DOH) consent order which was signed in 1993 between the DOH and the City. The main objective of the consent order was to establish secondary treatment facilities at the plant to allow for those treated portions of the wastewater flow to be reused.  The secondary treatment facilities at Honouliuli were completed in 1996 and initial water reuse was initiated in 1998 with approximately 2 mgd being used for in-plant demands.

Additionally, in 1995, the U.S. Environmental Protection Agency (EPA), DOH, and the City entered into an agreement known as the 309 Consent Decree, which required a significant commitment by the City to improve its wastewater system.  As part of the 309 Consent Decree requirements, the City was faced with spending at least $20 million to develop an effluent reuse system that would need to recycle 10 mgd of water by July 2001. The Honouliuli WWTP was selected for implementation of the water reuse requirements because of the demands on the ‘Ewa caprock aquifer, the termination of sugar cultivation which led to the significant decrease in groundwater recharge, and the proximity of the facility to potential users of reclaimed water.


Construction of water recycling facilities within the Honouliuli WWTP commenced in January 1998 and was completed in the summer of 2000.  The facility was officially dedicated in August 2000.  Prior to its dedication, the water recycling facility was purchased by the Honolulu Board of Water Supply (BWS) in July 2000 for $48.1 million from USFilter Operating Services.


Overview of the Recycling Facility

The entire water recycling facility is located adjacent to the City & County of Honolulu’s Honouliuli WWTP.  Water recycling components include a Reuse Pump Station, a Sand Filter Structure which includes rapid mixing tanks and chemical flocculators, Ultraviolet Light (UV) Disinfection, a Microfiltration/Reverse Osmosis Building, Storage Tanks, and a Product Delivery Pump Station.

The facility currently has a capacity of 12 million gallons per day (mgd) and produces two grades of recycled water.  R-1 water is used for irrigational uses, and Reverse Osmosis (RO) for industrial uses.  The facility is currently capable of producing up to 10 mgd of R-1 water, which is the highest level of treatment as designated by the Hawai‘i DOH.  R-1 water is currently used throughout the state of Hawai‘i for golf course irrigation, landscaping, and agriculture.  On the other hand, RO water is intended strictly for industrial uses such as boiler feed water, cooling tower make-up water, and process water for refineries.  The facility currently has an RO capacity of 2 mgd.  Both types of recycled water begin with secondary treated effluent from the Honouliuli WWTP.

The R-1 process includes the following components:

Schematic Diagram of R-1 Process

  • Rapid Mix Tanks
  • Chemical Flocculators
  • Sand Filters
  • Ultraviolet (UV) Light Disinfection
  • R-1 Transfer Pumps
  • Two 2.5 Million Gallon R-1 Storage Tanks
  • R-1 Product Delivery Pumps

Secondary effluent flows by gravity from the existing Parshall flume box into the Reuse Pump Station.  Lift pumps in the Reuse Pump Station convey effluent to the Sand Filter Structure, where polyaluminum chloride is added and rapidly mixed in one of two mixing tanks.  The effluent then flows into one of three flocculation tanks to facilitate the coagulation of suspended and dissolved particles to form larger and/or denser particles.  The effluent then flows into one of seven sand filter cells.  Filtered effluent is collected in an underdrain system to a clearwell at the rear of the Sand Filter Structure, then flows by gravity to the UV Disinfection system (consisting of 4 banks).  Disinfected effluent is then conveyed by the R-1 Transfer Pumps to one of two 2.5 million gallon storage tanks.  The R-1 effluent is then pumped to customers via the R-1 Product Delivery Pump Station.

01_parshall_flume 02_influent_pump_station 03_floc_tank 04_sand_filter 05_sand_filter_rear 06_uv_banks








The Reverse Osmosis (RO) process includes the following components:

  • Microfiltration
  • Reverse Osmosis
  • One 0.5 Million Gallon Storage Tank
  • RO Delivery Pumps

The production of RO water utilizes the membrane filtration process.  Membrane filtration consists of a permeable membrane that allow particles smaller than the membrane pores to pass through, but captures particles that are larger than the membrane pores.  In general, relatively high pressures are required to force the effluent through the permeable membrane.

The reverse osmosis process typically uses higher pressures and smaller pore sizes than microfiltration.  Consequently, reverse osmosis can remove particles with lower molecular weights than microfiltration.  Because of the high pressures involved in reverse osmosis, the process is capable of de-ionizing water and is typically used for desalination.  Microfiltration is used as a pretreatment separation process downstream of the secondary treated effluent from the adjacent Honoluliuli WWTP secondary units. Self cleaning strainers at the Reuse Pump Station remove larger-sized particles that could clog the microfilters.  The microfiltration process then removes additional residual suspended solids in the secondary effluent by utilizing a 0.2 micro hollow fiber membrane that is cleaned monthly using citric acid. This enables the reverse osmosis process to remove higher levels of ionic constituents from the effluent, thus reducing the degree of post-treatment required by RO water users to meet their water quality requirements.  The microfiltration pretreatment process also prolongs the life of the reverse osmosis membranes by reducing the amount of membrane fouling and consequent cleaning required.

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The Honouliuli WRF currently supplies the City golf courses of West Loch and ‘Ewa Villages with 1 mgd each of R-1 water.  Recycled water is pumped to the West Loch course at night, while the ‘Ewa Villages course is supplied during the day.  The pumping rate to each course is 150 gallons per minute (gpm) at a pressure of 68 pounds per square inch (psi).


For more information about the Honouliuli Water Recycling Facility, please visit the official Honolulu Board of Water Supply Water.  Organizations interested in touring the Facility may contact the Honolulu Board of Water Supply’s Water Recycling Program at phone (808) 527-6156.

Sanitary Sewer Overflow PSA [Video]

In 2009 the following 30-second public service announcement (PSA) videos were completed with funding jointly provided by a Federal Clean Water Act Section 319(h) grant from the U.S. Environmental Protection Agency (USEPA), the Hawai‘i State Department of Health (DOH), Clean Water Branch, and Learning Education Technology.  These videos are intended to educate the public about the problem of sanitary sewer overflows, which are oftentimes caused by disposal of inappropriate objects into the sewer system.  Additional funding was provided by the City & County of Honolulu and the McInerny Foundation.  Technical assistance was provided by the Hawai‘i Water Environment Association (HWEA).

For more information see:  Sanitary Sewer Overflow Overview

Sanitary Sewer Overflow Overview

Preventing Sewage Spills
Caution SignOverflows and spills from sewer lines onto our roadways and into our streams and oceans spoil our beautiful Hawaiian environment and can endanger public health. Sewage spills are costly to clean up (increasing your sewer bills) and can even hurt our tourist industry by causing beach closures. In a typical year, there are over 400 spills statewide involving more than two million gallons of raw sewage!

Learn about the sanitary sewer system and what you can do to help prevent SEWAGE SPILLS!

A Quick Overview
Preventing sewage spills is quite simple. Spills are simply caused by clogged pipes and/or too much flow. All everyone needs to do is keep unwanted things out of our sewer pipes such as grease, trash, rainwater and tree roots.

Illustrated below are some of the causes of sewage spills and how you can help prevent these spills (click here to download a higher resolution image shown below):

Causes of Sewage Spills

More Information on Sewage Spills
Now that you have a feel for the basic ways to prevent sewage spills, take some time to learn about the fascinating details of sewage spills and your underground sewer system. By reading through the information presented below, you can learn:

  • Important sewer system terms.
  • The difference between “sanitary sewers” and storm drains.
  • Why sewage spills are a BIG problem.
  • Typical causes of sewage spills.
  • How to keep grease and oils out of the sewer system.
  • How to keep rubbish out of the sewer system.
  • What infiltration and inflow are and why it is important to keep rainwater and other excess water out of the sewer system.
  • What you should do if you see a sewage spill.
  • Where more information on your sewer system can be obtained.

Ten Terms to Help You Better Understand Your Sewer System

  1. “SEWAGE” or “WASTEWATER.” This is the “used” water that contains human wastes from toilets and water from other sources such as sinks, showers, washing machines, etc. In addition to being odorous, sewage can contain large amounts of germs that cause disease. The term “wastewater” is often used in place of “sewage” to make things sound more pleasant when discussing this unpleasant subject.
  2. “SANITARY SEWER SYSTEM,” also known as “WASTEWATER COLLECTION SYSTEM,” or “SEWERS.” These are pipes through which sewage is carried from homes and businesses to a treatment plant. The sanitary sewer system includes the main sewer lines in the streets and the branch lines to individual sewer customers called “sewer laterals.”Sewer systems are generally designed to flow by gravity through sloped pipes until it reaches either the treatment plant or a sewage pumping station (which pumps the sewage up to another higher sewer or a treatment plant).Although sewage is very unsanitary, the term “sanitary sewer” is used because the sewer pipes are separate from the pipes used for storm water drainage. This helps protect public health and the environment. In some older cities, sewage and rainwater flow through the same pipes. This can cause major environmental and public health problems because untreated or partially treated-sewage is discharged into streams, rivers and other water bodies during heavy rain.
  3. “SEWER LATERAL.” This is the sewer pipe that connects a building’s plumbing system to the main sewer line in the street. Maintenance of sewer lateral pipes located within private property is generally the responsibility of the property owner. Sewer laterals are also called “service laterals,” “house laterals,” or simply “laterals.”
  4. Sewer Cleanout“SEWER CLEANOUT.” This is a pipe rising from the sewer lateral to the ground surface with a removable cap or plug. It is used to access the sewer lateral to free blockages. A sewer cleanout is usually located just inside the property line. There may be additional sewer cleanouts at various other locations in your property.
  5. “WASTEWATER TREATMENT PLANT”or “WASTEWATER RECLAMATION FACILITY”. These are facilities where organic matter, bacteria, viruses and solids are removed from sewage through physical, biological and chemical processes. The treated wastewater (called effluent) may be disposed of by discharging it to water bodies (mainly the ocean in Hawaii), injecting it into the ground, or reusing it for irrigation or other beneficial non-potable (non-drinking) uses.
  6. Infiltration“INFILTRATION.” This refers to groundwater (water found below the ground surface) that enters sewer pipes through cracks, pipe joints, and other system leaks. Because sewers in coastal areas are typically buried deep, they are often located below the water table. Since most sewer lines do not flow full (under pressure), groundwater “infiltrating” into the sewer line is actually more of a problem than sewage leaking out of the line. Storm events can raise groundwater levels and increase infiltration of groundwater into sewer pipes. The highest infiltration flows are observed during or right after heavy rain. Too much infiltration will overload the sewers and cause spills!
  7. “INFLOW.” This is rainwater that enters the sewer system from sources such as yard and patio drains, roof gutter downspouts, uncapped cleanouts, pond or pool overflow drains, footing drains, cross-connections with storm drains, and even holes in manhole covers. Inflow is greatest during heavy rainfall and like infiltration, can cause excessive flows and sewage spills.
  8. “PATHOGENS.” These are harmful germs in raw sewage that cause diseases such as cholera, dysentery, hepatitis and gastroenteritis.
  9. Manhole Cover“MANHOLES.” Sewer manholes are underground structures used to provide access to underground sewer lines and are usually found in a street, parking area or sidewalk. Access is required to periodically inspect and clean the lines. Sewer manholes typically have heavy round covers with the words “Sanitary Sewer” on the cover.
  10. Sanitary Sewer Overflow“SANITARY SEWER OVERFLOW.”Sewage spills are technically called “sanitary sewer overflows” since it involves the overflow of sewage from the sanitary sewer system. The word “sanitary” is used only because the overflow is from the sanitary sewer system, and not because the raw sewage is sanitary! (See definition of sanitary sewer above). For simplicity, we will use the term “sewage spill” or “sewage overflow.”Sewage overflows often occur from sewer manholes in the streets. Sewage can also backup into homes through your toilets, showers and floor drains. Sewage spills are caused by sewage filling the sewer pipes behind the clog to the point where it spills out of an opening in the system (generally the lowest manhole, shower drain or other plumbing fixture).

What is the difference between “sanitary sewers” and “storm drains”?

“Sanitary sewers” collect and convey sewage to a treatment plant where the sewage can be treated. It is important to understand that sanitary sewers are a completely different set of pipes from “storm drains.”

In Hawaii and most other areas, an independent system of pipes called “storm drains” is used to only transport storm water (i.e., rainwater) to streams, bays and the ocean with little or no treatment. The separate “sanitary sewer system” (see definition above) is “sanitary” because it keeps sewage out of the storm drains and sends the sewage to a treatment plant before it is released into the environment.

Some key points to remember are:

  • Sanitary sewers have limited capacities and are not designed to dispose of storm water (i.e., rainwater) from your property.
  • Storm drainage flows are generally not treated and therefore should not contain any pollutants that could affect our streams and ocean.
  • Rubbish should not be thrown down sewers or storm drains. Because sewage is treated, sewers can handle sewage as well as certain types and limited amounts of “toxic” materials such as household cleaners.

Why are sewage spills a public health, environmental and economic problem?

Sewage spills are simply an overflow of untreated or partially-treated sewage from the sewer system (i.e., the raw sewage overflows from a sewer line before it reaches the wastewater treatment plant). The sewage can overflow from the manholes in the streets, from open cleanout lines, or from toilets and drains in your home.

Spill inside a house

In really bad situations, someone else’s sewage could spill out of your toilet or shower and flood your home! Yuck!! This may not happen to you but what you do in your home could cause it to happen to someone else living farther down the sewer line!


Sewage spills are a big problem because:

  • Sewage spills cause public health problems. Spills can expose people to disease-causing germs (pathogens) such as E. coli and Cryptosporidium that are present in sewage.
  • Sewage spills can pollute our streams, the ocean and other bodies of water. In addition to being a public health problem, sewage can add unwanted nutrients to our water environment and cause excessive growth of algae that disrupts the ecosystem.
  • Sewage spills can pollute the groundwater, which in many inland areas, is our source of drinking water.
  • Sewage spills hurt our economy. Sewage spills are costly to clean up and this affects our sewer bills (which almost everyone feels are already too high!). More importantly, sewage spills can cause beach closures that can have a big impact on Hawaii’s tourism-based economy.

What are the main causes of sewage spills?

Sewage spills are caused by the clogging of pipes and/or too much flow. Clogging is caused by blockages from fats, oils and grease as well as rubbish, roots and other foreign or unwanted objects in the sewer system. Too much flow is caused by infiltration and inflow (i.e., groundwater and rainwater getting into the sewer system). The following sections discuss each cause in detail.

Keeping fats, oils and grease out of the sewer system

Grease inside sewer pipe

Fats, oils, and grease, and other byproducts of cooking come from meat, lard, shortening, butter, margarine, food scraps, sauces, and dairy products. They present a significant clogging problem for sewer systems. Fats, oils and grease stick to the inner walls of sewer pipes and reduce the diameter of the pipes over time. This eventually causes clogged sewer pipes and sewage spills.

Grease ball

Clogging is further caused by chunks of grease breaking away from the pipe walls and becoming stuck further down the line. Grease balls that form when grease combines with sand, grit, and other sewage debris can even become large and hard enough to clog sewage pumps!


Fats, oils and grease also flow down to the wastewater treatment plants where it disrupts operations and increases maintenance costs.


Regulations require restaurants and other commercial food handling facilities to install large grease separation devices to protect sewers from grease problems. Folks at home need to do their part!

How should we properly dispose of grease and oils?

Everyone can do their share to prevent clogged sewers by following these simple Do’s and Don’ts:


  • Cooking grease in panCollect oil and grease in a container filled with absorbent material (shredded newspaper, napkins, paper towels, rags, etc.) and properly dispose of it in the garbage.
  • Scrape grease and food scraps off cooking/serving utensils and plates for proper disposal. Better yet, wipe them with used napkins and paper towels before washing.
  • Encourage friends and neighbors to practice similar habits of proper oil and grease disposal. Parents, set a good example for your kids! Kids, educate your parents!


  • Do not pour grease or oil down the drain or toilet.
  • Do not dump greasy or oily food waste into the drain. (Minimize the use of your garbage disposal and better yet, compost your vegetable scraps!)

Some other points to remember:

  • Be sure to put your oil and grease in a suitable container or bag with absorbent material. The reason for using the absorbent material is so that your grease and oils do not leak out of garbage trucks and cause a big mess. Also, remember that solid grease can turn to liquid in our hot climate so use absorbent material for solid or semi-solid fats too!
  • If you have a large amount of cooking oil, consider using a disposable automotive oil change box filled with absorbent material. For even larger quantities (several gallons or more), take your used cooking oil to a recycler (check your yellow pages).
  • On Oahu, your trash is sent to HPOWER and therefore, instead of causing a costly sewer and environmental problem, throwing your fats, oils and grease in the trash is now helping to generate power and save everyone money!

Keeping rubbish out of the sewer system

Your toilet and sewer system are only designed to dispose of human wastes and toilet paper (which quickly breaks down). Unfortunately, people use the toilet as a wastebasket out of convenience. It is a huge “out of sight, out of mind” problem because people often don’t see the mess sewer overflows cause and the problems that sewer workers need to deal with!


Almost any type of rubbish may restrict sewage flow, clog sewers, and cause sewage overflows. Keep the following from going down your toilet and sinks:


  • Paper (paper towels, facial tissue (Kleenex), paper napkins, wrappers, etc.). Only toilet tissue is okay!
  • Plastics (bags, wrappers, bottles, cotton-tip shafts),
  • Rubber (gloves, condoms, underclothes elastic, etc.),
  • Cloth and fibers (cotton balls, tampons, cigarette filters, stockings, rags, etc.).
  • Food scraps (greasy items are the worst but minimize throwing down non-greasy items too. Try to even keep out smaller food items such as tea-leaves, coffee grounds or eggshells. Garbage grinders help but its even better not to use it where possible — compost what you can and throw the rest in the trash. Place food scraps in tightly sealed bags or other containers so it does not become an odor or rodent problem.)
  • Toys, cans, sticks, pebbles and sand, and pretty much all other solids except for human wastes and toilet tissue.

Why is it a problem? Rubbish and other objects often combine with hair, grease and other debris to cause clogging of the sewer system. Even something as small as a cotton tip swab with other attached debris can cause a blockage in sewer pipes. Rags and stringy material can clog sewage pumps. Malfunctioning sewage pumps, like clogged pipes, prevent sewage from flowing through the system and are a cause of spills. Any rubbish-type items that you dump in toilets and sinks at home, work, schools, shopping centers, movie theaters, or parks can contribute to sewage spills.

Do your share to keep rubbish from clogging our sewers by following these simple Do’s and Don’ts:


  • Place and use a wastebasket in the bathroom to dispose of rubbish (including disposable diapers and personal hygiene products).
  • Use sink and shower drain strainers.
  • Scrape food scraps into sealed containers or bags and throw them out in the garbage.
  • Educate each other on minimizing disposal of rubbish to our sewers.


  • Don’t use the sewer as a convenient means to dispose of food scraps.
  • Don’t use the toilet as a wastebasket!!

Keeping rainwater and other excess water out of the sewer system

What is infiltration and inflow?
Infiltration and inflow are the technical terms referring to rainwater and/or groundwater that enters the sewer system through such sources as cracked pipes, leaky manholes, or improperly connected storm drains and roof gutter downspouts. Most infiltration comes from groundwater and most inflow comes from rainwater. See the definitions presented earlier for infiltration and inflow. The following figure shows typical sources of infiltration and inflow.

Inflow and Infiltration Sources
Image courtesy of King County website

Why are infiltration and inflow big problems?
In addition to causing sewage spills, the additional flow from infiltration and inflow results in the need for larger sewers and treatment plants. This raises the sewer fees that residents and businesses must pay the government or private sewer agency to build, operate and maintain the sewers and wastewater treatment plants.

Sewer systems (sewer pipes and pumping stations) are designed to handle sewage flows from houses and businesses plus some additional flow from infiltration and inflow. Sewage flow rates used to design sewers have been developed over the years based on information obtained from water usage within the household and workplace. The exact volume of groundwater and rainwater (infiltration and inflow) entering the system, however, varies with location and is virtually impossible to predict. Infiltration and inflow entering the system can be much higher than the system’s capacity when there is too much leakage due to infiltration from deteriorated sewer pipes or significant sources of rainwater inflow.

The infiltration and inflow that enters the sewer system is transported to wastewater treatment plants along with the sewage. The groundwater and/or rainwater mixed with the sewage can double and even triple the design capacity of the treatment plant. Like the sewer system, the treatment plants are generally designed and constructed to accommodate the expected sewage flows plus some infiltration and inflow, but not large volumes of groundwater and rainwater.

When large volumes of infiltration and inflow increase the wastewater flow, the sewer system is overwhelmed to the point where a sewage spill can occur. The extra flow from infiltration and inflow simply causes the sewer system capacity to be exceeded. Sewage spills pose a public health risk due to increased probability of human contact with harmful pathogens as the sewage runs down the street to the storm drains, the streams, and eventually our recreational waters. Devastating backups of sewage into homes can also occur. In addition to causing sewage spills, the high flows can also affect the ability of the treatment plant to adequately treat the wastewater.

How does this affect the sewer fees that everyone pays? In many cases, your sewer agency will deal with heavy infiltration and inflow by increasing the size of the sewer pipes, pumping stations, and treatment plants.

Constructing large sewer lines to handle high infiltration and inflow is very expensive and has its own problems associated with it. For example, large sewer pipes tend to result in sluggish flow during normal low dry weather flows. This causes the organic matter to putrefy and generate gases that are both odorous and corrosive to the sewer pipes. The corrosive gases shorten the life of the sewer lines and manholes, which increases your sewer bill even more!

At the sewage treatment plant, high infiltration and inflow can result in a significant amount of money being spent to construct facilities that are rarely used. The sewer users pay for the higher maintenance costs as well as the added construction costs. Once again, this increases your sewer bill!

Who is responsible for the infiltration and inflow problem?
Although infiltration of groundwater is a concern, the large jump in flow caused by inflow of rainwater has the greatest impact on a sewer system. Through extensive studies on sewers in the U.S., it has been found that the greatest contribution of inflow comes from private property. Common inflow sources include direct connections from rain gutter downspouts, outdoor drains, and pool/pond overflow pipes connected to the sewer lines. Uncapped cleanouts and broken house sewer laterals also cause excessive rainwater to enter the sewer system.

Although these inflow connections at your home may alleviate the inconvenience of yard flooding and puddles, they have significant impacts to the sewer system, the sewer rates, and public health. It has been estimated that as much as 40% of the total infiltration and inflow is contributed by the “private” side of the sewer. The individual sewer user therefore can play a HUGE role in minimizing sewer fees, promoting proper functioning of the sewer system (reducing spills), and protecting the environment. Your sewer agency is probably spending a lot of money replacing old defective sewer lines in the streets to reduce infiltration but individual sewer users must do their part in reducing rainwater inflow!

What can you do to prevent and reduce infiltration and inflow?
The following are important actions that sewer users can take to help reduce infiltration and inflow:

  • DownspoutInspect the rain gutters on your house to see if the downspout connects to a sewer line. Such connections are illegal (violation of the plumbing code)! If the gutter downspouts are connected to the sewer line, have them disconnected-the large amount of water from the roof can cause a sewage spill. The rainwater needs to be directed onto your lawn and/or to the storm drain system.
  • Look for and check your sewer cleanout. The cleanout is usually a small pipe, about 4-inches in diameter, outside your house that is used to access the sewer lateral for cleaning. You will normally find it near the house (where the sewer lateral comes out) and/or near the property line (where the sewer lateral connects to the main sewer line). Make sure the cap to the cleanout pipe is not missing and has not been damaged (such as by a lawn mower). Replace missing caps so that rainwater cannot get into the sewer line. Kids love to throw rocks, toys and other nasty things down an uncapped cleanout! By keeping the cleanout capped, you can also prevent unpleasant sewer odors and gases from escaping.
  • Check to see that outdoor patio, deck or yard drains are not connected to the sewer. Also, be sure that pool or pond overflow drains are not connected to the sewer. These connections are not allowed by the plumbing code. You may want to call your plumber to assist you in checking your connection. You can also try calling your sewer agency for assistance since they often have personnel that can trace lines and have a strong interest in keeping rainwater out of the sewers. If you are voluntarily taking steps to find and correct the problem, it is unlikely that you will be fined for the illegal connection(s).
  • If you live in a low area with a high water table, and/or experience a lot of settlement on your property, you may want to have your sewer line checked for cracks, separated joints, or “sags” that could cause entry of rainwater or clogging problems. Many plumbers now have miniature video cameras that can be sent down your line to check if the line has any significant damage or other problems.
  • Avoid planting trees and shrubs over or near the sewer laterals. This also applies to sewer mains that may be in yard easements. Roots can enter and damage sewers. This allows groundwater and rainwater to enter the sewer and also causes costly ongoing problems with sewer clogging, backups and spills.
  • If you have a basement sump pump to pump out groundwater or rainwater leakage, be sure that it does not connect to your sewer pipes or to a sink or floor drain in your basement. This would be another source of unwanted excess flows that can overload the sewer system.
  • If your area is experiencing flooding, NEVER try to drain the areas by removing the sewer manhole covers in the street or covers from your cleanouts. The huge amount of flow that would enter the sewer system will definitely cause a problem downstream. Notify your sewer agency if you observe or know of someone doing this.

What should you do if you see a sewage spill?

Make sure that people are kept away from the area of the overflow, typically a manhole cover. This is especially important for children and pets who may play near the overflow area (e.g. street, public park, or local stream).

SSO from manholeIf liquid is coming out of a manhole cover with “Sanitary Sewer” on it, it is probably sewage! Note that sewage is not brown or yellowish in color and actually looks like dirty gray dishwater. Especially during heavy rain, take note of and report any sewer manhole covers that you see lifting up and spilling sewage.

Report the sewer overflow immediately to the statewide Hazard Evaluation and Emergency Response Hotline (Ph. 586-4249 during working hours; Ph. 247-2191 after hours) or your sewer agency if you have their number. Quick action is required to reduce the risk of public exposure to raw sewage by stopping the overflow, monitoring its impact, and ensuring proper cleanup.

Where can I obtain more information?

For any questions on your plumbing system, call your local city or county building department. They are the experts on plumbing codes and what should or should not be connected to the sewer line.

Most plumbers would be able to assist you in locating and disconnecting illicit sources of rainwater discharge to the sewer line within private property.

For problems with the sewer lines in the road and other public property, contact your sewer agency or private wastewater service provider.

For any other questions, feel free to email HWEA at As a public service, we will do our best to respond to your questions or direct you to someone who can. HWEA can also provide or find speakers to do presentations on most topics related to wastewater treatment and water pollution control.

Keep Hawaii Spill Free!

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Impacts of the Clean Water Act in Hawaii

On October 18, 1997, the Clean Water Act (CWA) celebrated its twenty-fifth anniversary as a landmark piece of legislation which spawned tremendous changes and improvements to the water environment in our country.

The Federal government’s involvement in prevention of pollution of interstate waters actually began over 100 years ago with the enactment of the Rivers and Harbors Act of 1890, which prohibited discharges of filth and pollutants that could impede navigation into such waters. In 1899, however, the act exempted “refuse flowing from streets and sewers” in a liquid state.

Although there were increasing pollution problems as the country grew and developed, little else was done from then until the 1940s. During the industrial boom that followed World War II, the country prospered and Americans enjoyed a higher standard of living, but this was not achieved without sacrifices. As much as 7 million tons of untreated or inadequately treated wastes were dumped daily into our waterways which turned many rivers into sewers and lakes into stagnant pools. Many water bodies had become too dirty for fishing and swimming or too polluted for aquatic and wild life. From 1948 to 1970, Congress enacted six principal bills which not only toughened the controls over discharges, but also included inducements in the form of authorizations for loans and grants to states to develop comprehensive plans and standards to control the discharge of pollutants and for the construction of projects that conformed to such plans and standards.

Pollution was not, however, being effectively controlled primarily because of an unmanageable system of setting discharge limits for each individual discharger based on the impacts of its discharge on the receiving water quality. With increasing closures of beaches and fishing beds and incidents like the Cuyahoga River in Ohio catching fire, public indignation turned to outrage and Congress was spurred to action. Changes to the environmental strategy of the nation such as the establishment of the U.S. EPA (the Environmental Protection Agency) culminated in the enactment of the 1972 amendments to the Federal Water Pollution Control Act of 1948. These amendments and subsequent amendments constitute what is called the CWA. The primary goals of the CWA were to have all waters of the U.S. clean enough to be fishable and swimmable and to end all discharges of pollutants into waters.

With this act, a new era of pollution control began. The act required all dischargers to the Nation’s waters, industrial as well as municipal, to have discharge permits. It also set national uniform minimum treatment requirements which were technology based for discharges. The requirements for municipal discharges were for a minimum of secondary treatment, except for discharges into marine waters for which lower levels of treatment could be allowed if there were no impacts.

Higher levels of treatment of the effluent being discharged could be required if water quality dictated a need. Senator Edmund Muskie, one of the prime authors of this historic piece of legislation, described it as offering “Uniformity, Enforceability, and Finality”.


Construction Grants Program

The act, however, was not only a big stick. There was a carrot in the form of federal financial assistance to build municipal wastewater treatment plants under a Construction Grants Program. Grants of 75% of the total eligible project costs could be obtained. Since 1990 federal assistance to states have been grants to establish State Revolving Funds from which low-interest loans could be made to municipalities.

In Hawai‘i, the federal grant funds were supplemented with 10% grants from the state. Thus, the net cost to the counties was down to 15% of the cost of the facilities built. Of all the counties, the City and County of Honolulu, which had the greatest needs, benefited the most from the grants program. Great improvements to the water quality of O‘ahu have resulted from the projects that were made possible by the financial assistance.


Water Quality Program for Oahu

Honolulu’s efforts to resolve its water quality problems began in 1969, before the CWA, with the implementation of the WQPO. This was a study to:

  • Identify the water quality problems on O‘ahu;
  • Identify the wastes contributing to the problems and their characteristics and quantities;
  • Recommend alternative wastewater management systems to meet existing and future needs; and
  • Establish priorities and a plan of action.

The final product of this effort was a report, the Water Quality Program for O‘ahu with Special Emphasis on Waste Disposal, which was completed, coincidentally, in February 1972, the year of the CWA. The conclusion was that the design of water quality control systems should be directed toward the conservation of corals and other indigenous aquatic organisms, the protection of the aesthetic qualities of the water environment, and the protection of the various recreational uses of the waters. This was the plan that Honolulu has used to guide the course it took to alleviate the water quality problems that needed correction.

A major priority of the plan was to abate the problems associated with sewage discharges. These were discharges in Mamala Bay in the vicinity of the Sand Island, in the southeast portion of Kane‘ohe Bay, and in Pearl Harbor. The plan, however, not only covered the impacts of sewage discharges but also identified water quality problems in areas such as Honolulu Harbor, Ke‘ehi Lagoon, Kewalo Basin and Ala Wai Yacht Harbor where there were no sewage discharges and the problems were due to other contributing factors such as suspended solids, nutrients, and pesticides in non-point source discharges from agricultural and urban areas.


Sand Island Discharge

In 1972, the sewage from the entire urban Honolulu corridor extending from Red Hill to Niu Valley, amounting to about 62 million gallons per day (mgd), was being discharged off Sand Island through a 60-inch diameter outfall pipe about 3,700 feet offshore and at a depth of 38 feet. The discharge was raw sewage, totally untreated. It was an end-of-pipe discharge with no diffusers to spread the sewage to minimize the impact.

With no treatment preceding the discharge and all of the wastewater discharged at one single point, the debris in the sewage settled to the ocean floor. There were thick sludge deposits in the vicinity of the outfall and measurable impacts to the reef community as far away as where the Reef Runway is today. Polychaete worms and filter feeders, indicators of pollution, were abundant.



Photograph 1: Polychaete worms in a mound of debris near the old Sand Island Outfall discharge

The aesthetics of our receiving water were marred by an ever present thick, grayish-brown plume on the ocean surface, usually heading in the direction of ‘Ewa Beach and Barbers Point. As the plume spread it impacted the Ke‘ehi Lagoon area where the nutrients in the sewage stimulated growth of seaweed. Ogo, a favored seaweed, was especially abundant in the area.


Photograph 2: Slick caused by surfacing plume from old Sand Island Outfall discharging into shallow waters

During times when the trade winds were not blowing, debris from the sewage was carried toward the shore and could be found at distant recreational areas like Ala Moana Beach Park. Studies by University of Hawai‘i scientists, who had developed methods to recover viruses from seawater and to culture them, revealed that viruses from the discharge were being carried to the recreational waters.

By 1976, Honolulu had a new 78-inch diameter outfall which extended to about 1-1/2 miles offshore where the ocean was about 225 to 240 feet deep. The new outfall was designed to incorporate state-of-the-art technology that had been developed at the California Institute of Technology. The design reduced the impact of the discharge on receiving waters. Instead of discharging the sewage in one big mass from the end of the pipe, the outfall was designed with a 3400-foot long diffuser section which had 282 openings, ranging from 3 to 3.5-inches in diameter and spaced 24 feet apart. In this way the sewage was discharged in small amounts from each port and spread out over the length of the diffuser. The outfall was designed to keep the sewage from impacting the ocean bottom and nearshore recreational areas. The new outfall also kept sewage from reaching the ocean surface most of the time so that it would not be visible.

The Sand Island Wastewater Treatment Plant was not completed until 1981 and therefore raw sewage was discharged through the new outfall from 1976 until the Sand Island Wastewater Treatment Plant was operational. With the start of operation of the new outfall in 1976, even with a raw sewage discharge there was dramatic improvement to the water quality, demonstrating the efficacy of the design of the new outfall. There no longer was a visible plume on the water surface and without navigational tools a boat would not be able to locate the outfall.


Photograph 3: The deep, blue waters show no evidence of the discharge from the new Sand Island outfall

Analyses of samples of the sands at the ocean bottom in the area of the new outfall diffuser, collected by lowering a sampler from a boat, indicated that the solids in the sewage were not settling and creating deposits. It was not, however, until about 1982 when the University of Hawai‘i’s research submarine, the Makali‘i, came back with pictures of the clean white sand right at the discharge ports that all doubts about the outfall design were erased. Other pictures also showed that the rocks that are used to anchor and protect the outfall provide relief and habitats on an otherwise barren sand bottom and attracted a new and more diverse population of aquatic biota.


Photograph 4: Clean bottom at the new Sand Island Outfall (photo credit: Makali’i)

In follow-up virus studies conducted in 1977–1978 the University of Hawai‘i researchers were not able to isolate viruses from the seawater samples taken in the same areas that were sampled in their initial study. Even doubling of the amount of seawater filtered for each sample did not result in positive readings. The only sample that tested positive was collected directly over the new outfall site.

A dramatic demonstration that the discharge was no longer affecting the areas close to the shore where recreational activities occur was the decline of the ogo that had abounded in the Ke‘ehi Lagoon area. With the nutrients in the sewage no longer available to the ogo after the new outfall went into operation, the ogo has to rely on the nutrients in runoff and while still growing in the area, it is no longer plentiful.

The CWA applied to all discharges, not only the municipal discharges. An example of a major discharge that was eliminated was the discharge of approximately 10 mgd of pineapple wastes into Kapalama Canal. With such discharges no longer permitted, it was diverted into the City and County of Honolulu’s sewer system in the mid-70’s. This discharge had caused gross pollution of the canal waters which resulted in a horrendous stench on Nimitz Highway. With the elimination of the discharge, the odors eventually disappeared.


Kaneohe Bay

Kane‘ohe Bay contains some of O‘ahu’s finest reefs and a rich and diverse aquatic ecosystem. As the Kane‘ohe area developed, runoff transported increasingly greater silt and nutrient loads from disturbed lands. In addition there were discharges from two secondary wastewater treatment plants, the Kane‘ohe Marine Corps Base wastewater treatment plant (WWTP) and City and County of Honolulu’s Kane‘ohe WWTP. These plants discharged into the southern end of the bay which is quite sheltered and has poor water circulation. The treatment plants added additional organic matter, suspended solids, and more importantly, nutrients into the bay. These imposed stresses resulted in high turbidity in the water column making the water murky. Excessive algal growth, deposition of solids, and the activities of bottom organisms such as filter feeders and burrowing worms were killing the coral reefs.



Photograph 5: Murky, turbid waters of Kane’ohe Bay prior to diversion (left) compared with clear, post diversion water (right)

Diversion of the sewage discharges to a new outfall that discharged to the open ocean off Mokapu Peninsula was recommended to correct the problems. By December 1977, the Mokapu outfall and the diversion lines from the two treatment plants to the outfall were completed and the diversion began. An extensive study of Kane‘ohe Bay was conducted from January 1976 through August 1979 and thus covered the pre- and post-diversion periods. The study showed that after the sewage diversion, clarity of the bay’s waters improved more rapidly than would have been predicted and, within a year, the water was very clear. Although the algal masses that had been smothering the coral also decreased quickly, the coral community had a more gradual recovery. Later studies about 5 years after the diversion showed the corals were recovering nicely.


Pearl Harbor

There were several major sewage discharges into Pearl Harbor. Two were the City and County of Honolulu’s Pearl City WWTP primary treated discharge and Waipahu WWTP secondary treated discharge. The Navy was discharging untreated, raw sewage into the harbor as well as secondary treated effluent from its Fort Kamehameha and Iroquois WWTPs near the mouth of the harbor. There were also indirect wastewater discharges from inland treatment plants into the harbor via streams that eventually emptied into the harbor. These treatment plants were the City and County of Honolulu’s Mililani and Palisades (Pearl City) plants and the Army’s Schofield plant. O‘ahu Sugar Company was discharging some of its soil laden sugar mill wastewaters into the harbor. All of these discharges had caused the harbor waters to deteriorate to such a state that in the late 1960’s, the Federal Water Pollution Control Administration, the forerunner of the EPA, to decided to conduct a study to evaluate what needed to be done to rectify the situation.

Diversion of the City and County of Honolulu’s sewage discharges to a deep ocean outfall extending about 1-1/2 miles offshore from One‘ula Beach Park in ‘Ewa Beach was required. The Navy was required to terminate its raw sewage discharge and send the sewage to the Fort Kamehameha WWTP for treatment. O‘ahu Sugar Company was required to recycle its wastewater for cane irrigation. Although no studies have been performed on Pearl Harbor to document its recovery, anecdotal information from federal employees indicate that there have been significant improvements.


Waivers from Secondary Treatment Requirements

Under the CWA, waivers from secondary treatment requirements can be granted by the EPA for discharges from municipal wastewater treatment plants that are into the deep ocean. The municipality must demonstrate that its discharge of the less than secondary treated effluent has no adverse impacts on the marine environment and on public health. The City and County of Honolulu has been granted waivers for its discharges from its Honouliuli and Sand Island WWTPs. Its on-going studies have continued to show that primary treatment is adequate for the discharges. A more recent $8 million study by the Mamala Bay Commission, an independent board established as a result of settlement of a lawsuit by the Sierra Club and Hawaii’s Thousand Friends against the City and County of Honolulu confirmed the results of the on-going studies. Even the State’s bacterial standards for recreational waters, the most stringent in the country were shown not to be exceeded.


Clear Successes

The CWA established requirements for all dischargers to clean up or eliminate their discharges. While the private sector had to fund its improvements, the Construction Grants Program of the CWA assisted and enabled the City and County of Honolulu and other municipalities across the country to implement many of the necessary pollution prevention and control projects that they otherwise may not have been able to afford. The federal construction grant funds which were made available to the State of Hawai‘i amounted to about $360 million dollars, of which the City and County of Honolulu received an estimated $260 million. Since the grant funds represented 75% of the total eligible costs of the projects, it means the total costs of Honolulu’s projects were at least $347 million. With the State contributing 10% of these project costs or about $35 million, the City and County of Honolulu’s share of the costs was only the remaining 15% or $52 million. The documented improvements in the water quality of O‘ahu that resulted from these projects have been tremendous and the CWA can be considered a clear success here in Hawai‘i as well as throughout the rest of the country.


Future Challenges

In the first 25 years of the CWA, the emphasis has been on the cleanup of known pollutant sources or point sources. These were easy targets and also easier to control. The Water Quality Plan for O‘ahu (WQPO) indicated that while gross pollution effects were being caused by point sources, primarily ocean or estuary discharges from the City and County of Honolulu’s wastewater treatment plants, there were other sources of pollutants. Noted were runoffs from streams and agricultural discharges. With the major point sources on O‘ahu now improved to an extent that further improvement will not provide significant benefits, it is necessary to reassess where expenditures of limited public funds should be directed.

The State Department of Health has designated several areas of O‘ahu as Water Quality Limited Segments (WQLS). These are areas where the water quality chronically does not meet the State’s Water Quality Standards and include Ala Wai Canal, Honolulu Harbor, Kahana Bay, Kane‘ohe Bay, Ke‘ehi Lagoon, Kewalo Basin, Pearl Harbor, and Waialua–Kaiaka Bay. It is noted that, except for Pearl Harbor, sewage is not being discharged in these areas and cannot be blamed for the problem. Rather, these are areas that are affected by high mass emissions of pollutants by non-point sources. Further, after intense rainstorms our coastal waters are often colored brown by sediments carried by the runoff. During these periods, although the bacterial counts are often higher than the State standards, the State Department of Health does not normally close beaches unless a sewage spill has occurred at the same time.

Water quality managers are focusing on an approach called watershed planning where all of the pollutant sources in a watershed are evaluated instead of concentrating on specific sources. By taking this comprehensive approach, water quality problems can be prioritized so that limited resources are directed where the returns will be the greatest. While this approach may seem to be logical, it can require a great deal of effort to develop a consensus on the priorities. This is a challenge that faces us all if we are to make significant future strides in water quality improvements.

Award History

Fiscal Year Awarded Recipient
1966-67 Nathan Burbank, Jr.
1969-70 Albert Tom
1975-76 James Kumagai
1978-79 Chris Hong
1981-82 Frank Stone, Jr.
1984-85 Spencer Yim
1987-88 Michael Chun
1989-90 Reginald Young
1992-93 Victor Moreland
1993-94 David Bills
1996-97 Lee Mansfield
1997-98 Dennis Tulang
1999-2000 James Honke
2000-2001 Roy Abe
2002-2003 Lance Manabe
2003-2004 Kenneth Ishizaki
2005-2006 Edie Eldeen
2006-2007 Eassie Miller
2008-2009 Lori Kaj Morikami


Fiscal Year Awarded Recipient
1974-75 Howard Cue
1977-78 Galen Toyooka
1980-81 Charles Saiki
1983-84 Clement Souza
1986-87 Raymond Sugita
1990-91 Nicanor Musico
1992-93 Ian Kagimoto
1993-94 Allen Perry
1996-97 Kevin Nakamura
1997-98 Clifford Kiger
1999-2000 Guy Moriguchi
2003-2004 Richard Antonio
2006-2007 Solomon Naone


Fiscal Year Awarded Recipient
1996-97 Xijin Zhang
1997-98 Barney Asato
1998-99 Lourdes Vazquez
1999-2000 Anita Fernandez
2000-2001 Robert Rychlinkski
2003-2004 Terrence Tanaka
2005-2006 Merlita Empeno Cabuantan
2007-2008 Jacqueline “Snookie” Mello


Fiscal Year Awarded Recipient
1963-64 B.J. McMorrow
1963-64 Shinji Soneda
1963-64 Albert Tom
1997-98 Charles Zickafoose
2000-2001 Chris Hong
2002-2003 Chew Lun Lau
2002-2003 Reginald Young


Fiscal Year Awarded Recipient
2003-2004 Christopher Hong


Fiscal Year Awarded Recipient
1997-98 David Yamada


Fiscal Year Awarded Recipient
1995-96 Kevin Nakamura
1997-98 Herman Tomboc


Fiscal Year Awarded Recipient
1993-94 Clifford Kiger
1993-94 Edie Eldeen
1993-94 Kevin Nakamura
1994-95 Gary Carlino
1994-95 Valton Nakea
1994-95 Robby Robinson
1995-96 Cesar Arucan
1995-96 Dennis Yamaguchi
1996-97 Terry Onizuka
1996-97 Ed Torres


Fiscal Year Awarded Recipient
1994-95 Hawaii
1995-96 Hawaii
1996-97 Kauai
1997-98 Kauai
1998-99 Kauai
1999-2000 Kauai
2000-2001 Hawaii
2001-2002 Team Aqua
2002-2003 Maui
2003-2004 Maui
2004-2005 Maui
2005-2006 Maui


Fiscal Year Awarded Recipient
1995-96 Lori Kajiwara
1995-96 Linda Uchima
1996-97 Narendra Bagade
1996-97 Walter Billingsley
1996-97 Kristie Ching
1996-97 Suzette Hokama
1996-97 Jay Stone
1996-97 Pamela Tsugawa
1996-97 Dina Ueoka Lau
1996-97 Tina Nakasone
1997-98 Anita Fernandez
1997-98 Myron Honda
1997-98 Robert Rychlinski
1997-98 Lourdes Vazquez
1997-98 Leanne Watanabe
1998-99 John Harrison
1998-99 Kyle Yukumoto
1998-99 Ken Kawahara
1998-99 Kevin Mori
1998-99 Cheryl Kaneshiro
1998-99 Lesley Toyota
1998-99 Grant Moriwaki
1998-99 Royce Fukunaga
1998-99 Ann Tsuhako
1998-99 Anita Fernandez
1998-99 Robert Rychlinski
1998-99 Greg Chung
1998-99 Jay Stone
1998-99 Leanne Watanabe
1999-2000 Tom Myers
1999-2000 Mike Nishimura
1999-2000 Anna Lee
1999-2000 Leland Lee
1999-2000 Cindy Masuoka
1999-2000 Craig Chung
1999-2000 Wade Thode
1999-2000 David Yamada
1999-2000 Kevin Kashimoto
1999-2000 Travis Hylton
2000-2001 Paul Arita
2000-2001 Jay Hamai
2000-2001 Debra Ikeno
2000-2001 Lynn Katahara
2000-2001 John Katahira
2000-2001 Ayako Kawabata
2000-2001 Jason Lau
2000-2001 Sheryl Nojima
2001-2002 Ian Arakaki
2001-2002 Mark Goodrowe
2001-2002 Dwight Ho
2001-2002 Lisa Kimura
2001-2002 Lori Kajiwara
2001-2002 Jon Kawamura
2001-2002 Woodie Muirhead
2001-2002 Michael Nishimura
2001-2002 Kyle Okino
2001-2002 Jeff Rebugio
2001-2002 Kris Swanson
2001-2002 Gayle Takasaki
2001-2002 Linda Uchima
2002-2003 Roger Aoki
2002-2003 Paul Arita
2002-2003 Paulette Chang
2002-2003 Robin Hirano
2002-2003 Jimmy Honke
2002-2003 Debra Ikeno
2002-2003 Ayako Kawabata
2002-2003 Jon Kawamura
2002-2003 Garrett Leong
2002-2003 Reef Migita
2002-2003 Randall Shimoda
2002-2003 Doug Yamamoto
2002-2003 Ryan Yamauchi
2004-2005 Greg Arakaki
2004-2005 Richard Harada
2004-2005 Taryn Takiguchi
2004-2005 Anita Fernandez
2004-2005 Lourdes Vazquez
2004-2005 Lyle Shizumura
2004-2005 Merlita Empeno
2006-2007 Dennis Tulang
2006-2007 Lori “Kaj” Morikami
2006-2007 Joel Frenzel
2006-2007 Sheldon Hunt
2006-2007 David Nagamine
2006-2007 Linda Hijirida
2006-2007 Cheryl Kaneshiro-Takeuchi
2006-2007 Linda Uchima
2006-2007 Freddie Leonor
2006-2007 Andrew Amuro
2006-2007 Wynn Miyamoto
2006-2007 Julie Yamato
2006-2007 Tina Sprague
2006-2007 Denis Lau
2006-2007 Theo Leong
2006-2007 Brooke Webber
2006-2007 Lianna Chang
2006-2007 Lauren Ishima


Fiscal Year Awarded Recipient
1993-94 Victor Moreland
1993-94 Bruce Roll
1994-95 Cory Waki
1994-95 Geeta Rijal
1995-96 Jennifer Eng
1995-96 Matthew Nunogawa
1995-96 Muruleedhara Byapanahalli
1996-97 Muruleedhara Byapanahalli
1997-98 Reid Takamiya
2000-2001 Lara Hutto
2001-2002 Sumon Kanpirom
2002-2003 Reid Nishimura
2002-2003 Tieshi Huang
2003-2004 Kiana Frank
2003-2004 Derek Takahashi
2004-2005 Jandi Iha
2004-2005 Carol Matasci
2005-2006 Logan Lee


Fiscal Year Awarded Recipient
1963-64 Francis Aona
1964-65 B.J. McMorrow
1965-66 Albert Tom
1965-66 Franklin Sunn
1966-67 Christopher Hong
1967-68 Russell Smith, Jr.
1968-69 Nathan Burbank, Jr.
1968-69 B.J. McMorrow
1969-70 Ben Taguchi
1970-71 Albert Tsuji
1971-72 Frank Stone, Jr.
1971-72 Clay Miller
1972-73 Reginald Young
1973-74 James Kumagai
1974-75 David Holmes
1974-75 Francis Aona
1975-76 Harold Herras
1976-77 Kenneth lshizaki
1977-78 Lawrence Agena
1977-78 Christopher Hong
1978-79 Michael Chun
1978-79 Nathan Burbank, Jr.
1979-80 Martin McMorrow
1980-81 Vernon Yamamoto
1980-81 Reginald Young
1981-82 Gordon Dugan
1982-83 William Bonnet
1983-84 Maurice Kaya
1983-84 Wallace Miyahira
1984-85 David Bills
1985-86 David Yogi, Jr.
1986-87 Clement Souza
1986-87 Michael Chun
1987-88 Dennis Tulang
1988-89 Roger Fujioka
1989-90 Victor Moreland
1989-90 David Bills
1989-90 Eassie Miller
1989-90 Ian Kagimoto
1990-91 Lee Mansfield
1990-91 Roy Abe
1990-91 Tina DeJesus
1991-92 James Honke
1992-93 Myron Nomura
1992-93 Dennis Tulang
1992-93 Edie Eldeen
1992-93 Joe Padron
1994-95 Ivan Nakatsuka
1994-95 Steve Chang
1995-96 Joe Padron
1995-96 Dennis Tulang
1995-96 Lee Mansfield
1995-96 Allen Perry
1995-96 Roy Abe
1995-96 Victor Moreland
1995-96 Westley Chun
1995-96 June Nakamura
1995-96 Tina Ono
1996-97 Ian Kagimoto
1996-97 Lance Manabe
1996-97 Peter Ono
1996-97 Myron Nomura
1996-97 Russell Okita
1997-98 Roy Abe
1997-98 Edie Eldeen
1997-98 Suzette Hokama
1997-98 Dina Ueoka Lau
1997-98 Michael Lau
1997-98 Guy Moriguchi
1998-99 Leighton Lum
1998-99 Tessa Ching
1998-99 Steve Parabicoli
1998-99 Walter Billingsley
1998-99 Pamela Tsugawa
1999-2000 Allen Perry
1999-2000 Lori Kajiwara
1999-2000 David Nagamine
1999-2000 Tina Nakasone
1999-2000 Audrey Uyema Pak
1999-2000 Kevin Nakamura
1999-2000 Lee Mansfield
1999-2000 Grant Moriwaki
1999-2000 P.Y. Yang
2000-2001 Lance Manabe
2000-2001 Greg Chung
2000-2001 Leanne Watanabe
2001-2002 John Katahira
2001-2002 Dwight Nakao
2001-2002 Steve Parabicoli
2001-2002 Ivan Nakatsuka
2001-2002 Dan Peters
2001-2002 Victor Moreland
2002-2003 Ian Arakaki
2002-2003 Lisa Kimura
2002-2003 Matthew Louis
2002-2003 Joe Padron
2002-2003 Jimmy Honke
2002-2003 Dennis Tulang
2002-2003 Tina Nakasone
2003-2004 Peter Ono
2003-2004 Jon Kawamura
2003-2004 Paulette Chang
2003-2004 Anna Lee (2)
2003-2004 Roy Abe
2004-2005 Kristie Ching
2004-2005 Jon Nishimura
2004-2005 Roy Abe
2004-2005 Ann Tsuhako
2004-2005 Randall Shimoda
2004-2005 Elson Gushiken
2004-2005 Jay Stone
2004-2005 Travis Hylton
2004-2005 Kenneth Ishizaki
2005-2006 Dwight Nakao
2005-2006 Edie Eldeen
2005-2006 Dan Clark


Fiscal Year Awarded Recipient
1993-94 B.J. McMorrow
1994-95 Lawrence Agena
1994-95 Francis Aona
1994-95 Yasuo Arakaki
1994-95 Michael Chun
1994-95 Gordon Dugan
1994-95 Christopher Hong
1994-95 James Kumagai
1994-95 Robert Purdie, Sr.
1994-95 Reginald Young
1994-95 Charles Zickafoose
1994-95 Hiromi Okuda
1995-96 Kenneth Ishizaki
1995-96 Brian Gray
1995-96 Thomas Fujiwara
1995-96 Wayne Hashiro
1995-96 James Honke
1995-96 Maurice Kaya
1995-96 Chew Lau
1995-96 Edward Lau
1995-96 Robert Lau
1995-96 Kenneth Masatsugu
1995-96 Kay Muranaka
1995-96 Jerry Nunogawa
1995-96 Ben Taguchi
1995-96 Walter Takeuchi
1995-96 Ben Tanaka
1995-96 Ping Yi Yang
1995-96 Vernon Yamamoto
1995-96 Stanley Young
1995-96 Po Chan
1996-97 Foo Lim
1996-97 Victor Moreland
1996-97 Calvin Kim
1996-97 Randolph Distajo
1996-97 Robert Ishida
1996-97 John Ishikawa
1997-98 William Bonnet
1997-98 Royce Fukunaga
1997-98 Gordon Goeas
1997-98 Dennis Kaneshiro
1997-98 Hans-Jurgen Krock
1997-98 Myron Nomura
1998-99 Gordon Dugan
1999-2000 Leighton Lum
1999-2000 Cedric Takemoto
1999-2000 Earl Ng
1999-2000 Ivan Nakatsuka
1999-2000 Douglas Gomes
1999-2000 Steven Chang
2000-2001 Dennis Tulang
2000-2001 Denis Lau
2000-2001 Dave Yogi
2001-2002 Steven Saturno
2001-2002 Leland Lee
2001-2002 Cary Kondo
2001-2002 Clement Souza
2002-2003 Edie Eldeen
2002-2003 Glenn Hirano
2002-2003 Dominick Marino
2002-2003 David Nagamine
2002-2003 Jon Nishimura
2002-2003 Kenneth Sakai
2002-2003 Dale Takanishi
2002-2003 Kenneth Tenno
2003-2004 Jay Hamai
2004-2005 Robert Spetich
2004-2005 David Bills
2005-2006 Roy Abe
2005-2006 Francis Hino
2005-2006 L. Stephen Lau
2005-2006 Eassie Miller
2005-2006 Harry Muranaka
2005-2006 Sheryl Nojima
2005-2006 Robert Purdie
2005-2006 Karen Sumida
2005-2006 Bert Yamamoto
2005-2006 Lambert Yamashita
2008-2009 Gerald Yoshimoto
2008-2009 George Oliva
2008-2009 Dan Taira
2009-2010 Stephen Green
2009-2010 Steven Parabicoli
2009-2010 Howard Ikeda
2009-2010 Warren Kersten
2010-2011 Douglas Yamamoto
2010-2011 Guy Moriguchi
2010-2011 Peter Ono
2010-2011 Lee Mansfield
2011-2012 Zachary Asato
2011-2012 Wayne White
2011-2012 Westley Chun
2011-2012 Paul Scott
2011-2012 Craig Arakaki
2011-2012 Gary Okamura
2012-2013 Joseph Sagnis
2012-2013 Wayne Salas
2012-2013 Calvin Ota
2012-2013 Alden Abe
2012-2013 Cyril Hamada

History of the PWO Softball Tournament


During August of 1985 when the former City & County of Honolulu Wastewater Treatment & Disposal Branch’s Softball League concluded, we celebrated the end of the league’s season as well as a farewell for Eassie Miller, who was transferring to Maui County for employment. Ray Sugita’s last assignment for Eassie was for him to form a softball league on Maui.  This would facilitate a Wastewater Softball Tournament that could rotate from one island to another on a yearly basis.

Eassie was not able to form a softball league; however, he was able to gather enough players to have a team represent Maui and they hosted the first Inter-Island Wastewater Softball Tournament in 1986. The word also got out to Kauai County, so they rounded up a team to represent Kauai in the inaugural tournament. Kauai then hosted the second Inter-Island Wastewater Softball Tournament in 1987.

Word also went out to various engineering firms, in the hopes that a team of engineers (whether private or from the various counties) could be represented in the annual inter-island wastewater competition. Unfortunately, only one engineer in the entire State of Hawai‘i got the word and he ended up playing on the Kauai team since they had the least amount of players when the first tournament was held. This particular engineer, Vic Moreland, was later grandfathered into the Kauai team as a team of engineers never came about.

When the tournament originally started, it was known as the Inter-Island Wastewater Softball Tournament and was organized by Ray Sugita of the City & County of Honolulu. In 1993, Ray retired from the City, and the tournament continued to function with the Hawai‘i Water Environment Association – Professional Wastewater Operators (HWEA-PWO) as the tournament sponsor.  The PWO Representative was placed in charge of the tournament and the coordinator of the tournament would be a person on whichever island the tournament was being held.

With the exception of one year, the Inter-Island Wastewater Softball Tournament has been an annual event for the last 18 years. O‘ahu teams have won the tournament title 9 times, while Maui teams have taken the title a total of 7 times. Kauai has taken the title once, in 1994.

Below are the all-time tournament results:

Year Host Island Champion
1986 (1st) Maui Maui Turd Busters
1987 (2nd) Kauai Oahu Treatment & Disposal
1988 (3rd) Oahu Oahu Treatment & Disposal
1989 (4th) Maui Oahu Treatment & Disposal
1990 (5th) Kauai Maui Turd Busters
1991 (6th) Hawai Maui Turd Busters
1992 (7th) Oahu Oahu Treatment & Disposal
1993 (8th) Maui Oahu Treatment & Disposal
1994 (9th) Kauai Kauai Nitrifiers
1995 (10th) Hawai Maui Turd Busters
1996 (11th) Oahu Maui Turd Busters
1997 (12th) Maui Oahu Sewercide
1998 (13th) Kauai Oahu Hui O Kukae
1999 (14th) Hawai Oahu Hui O Kukae
2000 Oahu No Tournament Held
2001 (15th) Maui Maui Turd Busters
2002 (16th) Kauai Oahu Sewercide Squad
2003 (17th) Hawai Maui Turd Busters
2004 (18th) Oahu Oahu Sewercide Squad