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Drinking Water Quality Report


Waipahu-Ewa-Waianae - Honolulu, HI


Serves 170,921 people - Test data available: 2004-2009

This drinking water quality report shows results of tests conducted by the water utility and provided to the Environmental Working Group (EWG) by the Hawaii Department of Health. It is part of EWG's national database that includes 47,667 drinking water utilities and 20 million test results. Water utilities nationwide detected more than 300 pollutants between 2004 and 2009. More than half of these chemicals are unregulated, legal in any amount. Despite this widespread contamination, the federal government invests few resources to protecting rivers, reservoirs, and groundwater from pollution in the first place. The information below summarizes test results for this utility and lists potential health concerns.

 
This Drinking Water System
National Average
Exceed Health GuidelinesTests showing chemicals at concentrations above health guidelines established by federal and state health agencies. These guidelines are typically set at a levels that pose no significant health risk.
5 chemicals
4
Health Standard ExceedencesChemicals detected at concentrations above the legal limit, the Maximum Contaminant Level (MCLs) established by the U.S. EPA. Most MCLs are based on annual averages, so exceeding the MCL for one test does not necessarily indicate that the system is out of compliance.
0 chemicals
0.5
Pollutants FoundThe total number of contaminants detected since 2004, according to data provided by the state water agency.
11 chemicals
8
Tests ConductedThe total number of number of water quality tests conducted by water utilities and recorded in data provided by the state water agency.
22,817tests
420

Contaminants Exceeding Health Guidelines

ContaminantAverage/
Maximum
Result
Health Limit
Exceeded
Legal Limit
Exceeded

Testing History

-Tested      -Detected      -Over Health Guidelines      -Over Legal Limit*
1,2,3-Trichloropropane1,2,3-Trichloropropane is an industrial solvent, degreasing agent, and paint and varnish remover.0.34 ppb
1.12 ppb
Yes
<0.01 ppb
Legal at any levelThis is the Federal Limit. State Limits may be lower.
DieldrinDieldrin is a banned insecticide that is persistent and bioaccumulative, and was historically used on corn, cotton and citrus; it also forms in the environment as a breakdown product of the pesticide aldrin.<0.01 ppb
0.01 ppb
Yes
<0.01 ppb
Legal at any levelThis is the Federal Limit. State Limits may be lower.
BromoformBromoform is a disinfection byproduct from the trihalomethane (THM) family, and is formed when chlorine, chloramines or other disinfectants react with organic and inorganic matter in water.0.33 ppb
1.4 ppb
Yes
MCLGA non-enforceable health goal that is set at a level at which no known or anticipated adverse effect on the health of persons occurs and which allows an adequate margin of safety. Source: U.S. Environmental Protection Agency.: 0 ppb
No
80 ppb
AtrazineAtrazine is an endocrine-disrupting herbicide used on corn, sugarcane and sorghum; it is associated with adverse reproductive effects and toxicity to the immune system.<0.01 ppb
0.38 ppb
Yes
0.15 ppb
No
3 ppb
Arsenic (total)Arsenic contaminates drinking water due to mining runoff, erosion of natural deposits, emissions from glass and electronics processing and the use of arsenical compounds as wood preservatives and pesticides.0.06 ppb
2.29 ppb
Yes
MCLGA non-enforceable health goal that is set at a level at which no known or anticipated adverse effect on the health of persons occurs and which allows an adequate margin of safety. Source: U.S. Environmental Protection Agency.: 0 ppb
No
10 ppb
NOTE: Each dot in the above graph represents one month.
* Water utilities are noted as exceeding the legal limit if any test is above the maximum contaminant level (MCL). Most MCLs are based on annual averages so exceeding the MCL for one test does not necessarily indicate that the system is out of compliance.

Other Detected Contaminants

ContaminantAverage/
Maximum
Result
Health Limit
Exceeded
Legal Limit
Exceeded

Testing History

-Tested      -Detected      -Over Health Guidelines      -Over Legal Limit*
NitrateNitrate enters drinking water sources from fertilizer runoff, leaching septic tanks, and erosion of natural deposits; it is also emitted by chemical, petrochemical and metal-finishing industries.2.5 ppm
5.08 ppm
No
10 ppm
No
10 ppm
Chromium (total)Chromium is a metal that pollutes drinking water due to discharge from steel and pulp mills and erosion of natural deposits.2.29 ppb
12.2 ppb
No
100 ppb
No
100 ppb
Total trihalomethanes (TTHMs)Total trihalomethanes constitute the sum of four disinfection byproducts: chloroform, bromodichloromethane, dibromochloromethane, and bromoform.0.33 ppb
1.4 ppb
No
9.8 ppb
No
80 ppb
NitriteNitrite is a chemical that enters water from fertilizer runoff, leaching septic tanks, and erosion of natural deposits.<0.01 ppm
<0.01 ppm
No
1 ppm
No
1 ppm
CopperCopper is a naturally occuring metal and drinking water contaminant that enters tap water by corrosion of household plumbing systems and erosion of natural deposits.0.24 ppb
9.43 ppb
No
300 ppb
No
1000 ppb
Antimony (total)Antimony is a metal that enters water from petroleum refinery pollution, fire retardants, ceramics, electronics and solder.0.03 ppb
1.29 ppb
No
5.6 ppb
No
6 ppb
NOTE: Each dot in the above graph represents one month.
* Water utilities are noted as exceeding the legal limit if any test is above the maximum contaminant level (MCL). Most MCLs are based on annual averages so exceeding the MCL for one test does not necessarily indicate that the system is out of compliance.

Contaminants Not Detected - 79 chemicals

1,1,1-Trichloroethane, 1,1,2-Trichloroethane, 1,1-Dichloroethylene, 1,2 Dibromo-3-chloropropane (DBCP), 1,2,4-Trichlorobenzene, 1,2-Dichloroethane, 1,2-Dichloropropane, 3-Hydroxycarbofuran, Alachlor (Lasso), Alachlor Esa, Aldicarb, Aldicarb sulfone, Aldicarb sulfoxide, Aldrin, Aroclor 1016, Aroclor 1221, Aroclor 1232, Aroclor 1242, Aroclor 1248, Aroclor 1254, Aroclor 1260, Barium (total), Baygon (Propoxur), Benzene, Beryllium (total), Bromide, Bromodichloromethane, Butachlor, Cadmium (total), Carbaryl, Carbofuran, Carbon tetrachloride, Chlordane, Chloroform, cis-1,2-Dichloroethylene, Cyanide, Dibromoacetic acid, Dibromochloromethane, Dichloroacetic acid, Dichloromethane (methylene chloride), Endrin, Ethylbenzene, Ethylene dibromide (EDB), Glyphosate, Heptachlor, Heptachlor epoxide, Hexachlorobenzene (HCB), Hexachlorocyclopentadiene, Lead (total), Lindane, m-Xylene, Mercury (total inorganic), Methiocarb, Methomyl, Methoxychlor, Metolachlor, Metribuzin, Monobromoacetic acid, Monochloroacetic acid, Monochlorobenzene (Chlorobenzene), o-Dichlorobenzene, o-Xylene, Oxamyl (Vydate), p-Dichlorobenzene, p-Xylene, Propachlor, Selenium (total), Simazine, Styrene, Tetrachloroethylene, Thallium (total), Toluene, Total haloacetic acids (HAAs), Toxaphene, trans-1,2-Dichloroethylene, Trichloroacetic acid, Trichloroethylene, Vinyl chloride, Xylenes (total)

Pollution Summary

11Total Contaminants Detected (2004 - 2009)

Chromium (total), Copper, Nitrate, Nitrite, Antimony (total), Total trihalomethanes (TTHMs), Arsenic (total), Atrazine, Dieldrin, 1,2,3-Trichloropropane, Bromoform

5Agricultural Pollutants
(pesticides, fertilizer, factory farms)

Nitrate, Nitrite, Arsenic (total), Atrazine, Dieldrin

5Sprawl and Urban Pollutants
(road runoff, lawn pesticides, human waste)

Copper, Nitrate, Nitrite, Antimony (total), Arsenic (total)

6Industrial Pollutants

Chromium (total), Nitrate, Nitrite, Antimony (total), Arsenic (total), 1,2,3-Trichloropropane

2Water Treatment and Distribution Byproducts
(pipes and fixtures, treatment chemicals and byproducts)

Total trihalomethanes (TTHMs), Bromoform

5Naturally Occurring
(naturally present but increased for lands denuded by sprawl, agriculture, or industrial development)

Chromium (total), Copper, Nitrate, Nitrite, Arsenic (total)

2Unregulated Contaminants
EPA has not established a maximum legal limit in tapwater for these contaminants

Dieldrin, 1,2,3-Trichloropropane

EPA Violation Summary

No violations were reported for this system since 2004.

Information on violations is drawn directly from EPA's national violations database in the Agency's Safe Drinking Water Information System. Analyses by others have raised questions about the quality of the information in EPA's database. For the purposes of this investigation, EWG is not showing below or including in our analyses, those violations for individual water suppliers that occurred on days for which the total number of violations assigned by EPA to that water supplier was greater than 20. This criteria was based on common characteristics of incorrect violations data as identified by water utilities, from a review of EPA's violations data by several hundred utilities prior to the release of EWG's investigation.