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National Drinking Water Database


1,1,1-Trichloroethane in Washington


1,1,1-Trichloroethane is an industrial cleaning solvent that contaminates drinking water sources due to releases from metal degreasing sites and chemicals factories. [read more]

The Most Polluted Communities in Washington

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

Ranked by highest average 1,1,1-Trichloroethane level

RankSystem Population Served Positive test results of total reported tests Average Level
(Range)
1Bets Water System
Oak Harbor, WA
5010 of 1050 ppb
(39 to 61 ppb)
2North Glen Water Association
Colbert, WA
1047 of 75.39 ppb
(4.8 to 6 ppb)
3Stevens Co Pud - Loon Lake Sw
Loon Lake, WA
8261 of 10.6 ppb
(0.6 ppb)
4City of Vancouver
Vancouver, WA
178,16411 of 120.56 ppb
(0 to 1.2 ppb)
5B & J Water Co
Colbert, WA
773 of 50.5 ppb
(0 to 1.1 ppb)
6Rainier Terrace
Gig Harbor, WA
1001 of 40.48 ppb
(0 to 1.9 ppb)
7Clark Public Utilities
Vancouver, WA
79,94815 of 400.34 ppb
(0 to 1.4 ppb)
8City of Okanogan Water Department
Okanogan, WA
2,4353 of 60.33 ppb
(0 to 0.7 ppb)
9Stevens Co Pud - Long Lake
Loon Lake, WA
1,1531 of 20.3 ppb
(0 to 0.6 ppb)
10Olympic Mobile Village
Port Townsend, WA
1352 of 30.13 ppb
(0 to 0.3 ppb)

Health Based Limits for 1,1,1-Trichloroethane

StandardDescriptionLevel
Maximum Contaminant Limit (MCL)The enforceable standard which defines the highest level of a contaminant that is allowed in drinking water. MCLs are set as close to health-based limits (Maximum Contaminant Level Goals, or MCLGs) as feasible using the best available analytical and treatment technologies and taking cost into consideration. Source: U.S. Environmental Protection Agency.200 ppb
Maximum Contaminant Limit Goal (MCLG)A 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.200 ppb
Lifetime health-based limit, non-cancer riskConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic health effects for a lifetime of exposure. The Lifetime health-based limit (or Health Advisory, HA) is based on exposure for a a 70-kg adult consuming 2 liters of water per day. Source: U.S. Environmental Protection Agency.200 ppb
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.1000 ppb
Drinking Water Equivalent LevelA lifetime exposure concentration protective of adverse, noncarcinogenic health effects, that assumes all of the exposure to a contaminant is from drinking water. Source: U.S. Environmental Protection Agency.1000 ppb
Children's health-based limit for 10-day exposureConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic effects for up to ten days of exposure. The Ten-Day health-based limit (or Health Advisory, HA) is typically set to protect a 10-kg child consuming 1 liter of water per day. Source: U.S. Environmental Protection Agency.40000 ppb
Children's health-based limit for 1-day exposureConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic health effects for up to one day of exposure. The One-Day health-based limit (or Health Advisory, HA) is typically set to protect a 10-kg child consuming 1 liter of water per day. Source: U.S. Environmental Protection Agency.100000 ppb

Violation Summary for 1,1,1-Trichloroethane 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