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National Drinking Water Database


1,1-Dichloroethane in Washington


1,1-Dichloroethane is used in industrial chemical synthesis, as a solvent for plastics, paint, varnish, and finish removers and as an insecticide/fumigant.

The Most Polluted Communities in Washington

5 water utilities reported detecting 1,1-Dichloroethane in tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies

Ranked by highest average 1,1-Dichloroethane level

RankSystem Population Served Positive test results of total reported tests Average Level
(Range)
1North Glen Water Association
Colbert, WA
1047 of 73.71 ppb
(3.3 to 4.2 ppb)
2Bets Water System
Oak Harbor, WA
5010 of 101.06 ppb
(0.85 to 1.2 ppb)
3Meridian Heights Water District
Olympia, WA
1302 of 30.3 ppb
(0 to 0.5 ppb)
4Twin View Estates Community Assoc
Greenbank, WA
621 of 50.12 ppb
(0 to 0.6 ppb)
5City of Okanogan Water Department
Okanogan, WA
2,4351 of 60.03 ppb
(0 to 0.2 ppb)

Health Based Limits for 1,1-Dichloroethane

StandardDescriptionLevel
California Public Health GoalsDefined by the State of California Office of Environmental Health Hazard Assessment (OEHHA) as the level of contaminant that is allowed in drinking water. For acutely toxic substances, levels are set at which scientific evidence indicates that no known or anticipated adverse effects on health will occur, plus an adequate margin-of safety. PHGs for carcinogens or other substances which can cause chronic disease shall be based solely on health effects without regard to cost impacts and shall be set at levels which OEHHA has determined do not pose any significant risk to health.3 ppb

Violation Summary for 1,1-Dichloroethane in Washington

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

Violation TypeNumber of Violations
Failure to monitor regularly987