The Power of Information

National Drinking Water Database


Hawaii


106 systems serving 1,442,030 people

This drinking water quality report shows results of tests conducted by water utilities in Hawaii, 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 from 45 states and the District of Columbia. 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 in protecting rivers, reservoirs, and groundwater from pollution in the first place. The information below summarizes drinking water quality for this state.



 
Chemicals
Water Utilities
Population Served
Detected Chemicals
37
106
1,421,834
Exceed health guidelines*
21
85
1,343,002
Exceed Legal Limits*
2
2
28,157
Unregulated chemicals detected
2
13
1,020,192
* 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.

21 Contaminants Exceeding Health Based Limits

Contaminants detected in Hawaii drinking water above health guidelines, according to an Environmental Working Group analysis of data obtained from state water authorities

Contaminant
Population
Number of Systems
At Any Level Above Health Limits At Any Level Above Health Limits
Bromoform1,209,3011,209,3017171
1,2,3-Trichloropropane1,020,1921,020,1921313
Dieldrin831,925831,92522
Heptachlor epoxide713,330713,33022
Total haloacetic acids (HAAs)937,256266,3745047
Dibromochloromethane261,799261,7994646
Bromodichloromethane216,608216,6083131
Dichloroacetic acid215,079215,0792727
Atrazine270,225177,937168
Total trihalomethanes (TTHMs)1,247,127177,8298129

Water Utilities in Hawaii Reporting Chemicals Exceeding Health Guidelines

Water utilities in Hawaii reporting chemicals exceeding health guidelines, according to an Environmental Working Group analysis of data obtained from state water authorities, include:

System
Population
Chemicals tested
Chemicals found
Chemicals exceeding
health guidelines
Lihue-Kapaa Dow30,00096179
Lahaina17,96788159
Makawao27,64294188
Maunaloa-Kaluakoi1,00095147
Hakalau-Wailea38988117
Paauilo74495107
Ninole14994107
Lower Kula3,21394106
Wailuku61,34694126
Olowalu10080106
Waiki'i Ranch8494116
Kulani Correct. Facility2819476
Kukuihaele48083106
South Kohala12,10996126
Papaikou2,26295126
Waiawa Correctional Facil3349575
Waipahu-Ewa-Waianae170,92190115
Wahiawa24,4649095
Kunia Village6509575
Kahakuloa Water Co.1509475

Sources of Hawaii Drinking Water Contaminants

The contaminants identified in Hawaii drinking water come from a wide variety of sources, including agriculture, industry, water treatment plants, and polluted storm runoff from urban areas.

37Total Contaminants Detected (2004 - 2009)
11Agricultural Pollutants
(pesticides, fertilizer, factory farms)

Arsenic (total), Nitrate, Nitrite, Selenium (total), Atrazine, Heptachlor epoxide, Dieldrin, 1,2-Dibromo-3-chloropropane (DBCP), Ethylene dibromide (EDB), Chlordane, Ethylbenzene

12Sprawl and Urban Pollutants
(road runoff, lawn pesticides, human waste)

Arsenic (total), Cadmium (total), Copper, Lead (total), Nitrate, Nitrite, Antimony (total), Xylenes (total), Chlordane, Tetrachloroethylene, m-Xylene, o-Xylene

20Industrial Pollutants

Arsenic (total), Barium (total), Cadmium (total), Chromium (total), Lead (total), Nitrate, Nitrite, Selenium (total), Antimony (total), Hexachlorocyclopentadiene, 1,2,3-Trichloropropane, Ethylene dibromide (EDB), Xylenes (total), Carbon tetrachloride, Trichloroethylene, Tetrachloroethylene, Toluene, Ethylbenzene, m-Xylene, o-Xylene

12Water Treatment and Distribution Byproducts
(pipes and fixtures, treatment chemicals and byproducts)

Total trihalomethanes (TTHMs), Total haloacetic acids (HAAs), Chloroform, Bromodichloromethane, Dibromochloromethane, Dichloroacetic acid, Trichloroacetic acid, Bromoform, Dibromoacetic acid, Monochloroacetic acid, Monobromoacetic acid, Cadmium (total)

8Naturally Occurring
(naturally present but increased for lands denuded by sprawl, agriculture, or industrial development)

Nitrate, Copper, Barium (total), Lead (total), Arsenic (total), Chromium (total), Selenium (total), Nitrite

3Unregulated Contaminants
EPA has not established a maximum legal limit in tapwater for these contaminants

Lead (total), Dieldrin, 1,2,3-Trichloropropane


Testing Summary for Hawaii

The federal government has set standards for some of the pollutants found in tap water supplies.

Contaminants reported as tested by water suppliers in Hawaii96
 Contaminants tested due to federal law: 76
 Contaminants tested in addition to those required by federal law: 20

Violation Summary for Hawaii

Data from the U.S. Environmental Protection Agency includes the following violations of federal standards in Hawaii since 2004

Violation TypeNumber of Violations
Treatment Technique (Surface Water Treatment Rule)23
Failure to monitor regularly20
Filter Turbidity Reporting16
Maximum contaminant level, Monthly (Coliform bacteria)8
Over maximum contaminant level, Average7
Failure to monitor, Repeat Major (Coliform bacteria)2
Excess Turbidity at 0.3 NTU2
Failure to Filter (Surface Water Treatment Rule)1
Failure to monitor, Routine Minor (Coliform bacteria)1
Maximum contaminant level, Acute (Coliform bacteria)1
Treatment Technique Precursor Removal1
Failure to monitor, Routine Major (Coliform bacteria)1
Failure to monitor, Repeat Minor (Coliform bacteria)1