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National Drinking Water Database


1,1,1-Trichloroethane in New Hampshire


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 New Hampshire

5 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)
1Green Hills Mobile Home Park
Barrington, NH
5016 of 242.41 ppb
(0 to 10 ppb)
2Concord Group /Nh Claims Div
NH
294 of 50.28 ppb
(0 to 0.9 ppb)
3Newmarket Water Works
Newmarket, NH
5,00016 of 170.16 ppb
(0 to 0.8 ppb)
4Annie Oakley Mobile Home Park
Derry, NH
1276 of 7< 0.01 ppb
(< .01 to 0.0022 ppb)
5Litchfield Technology Park
NH
601 of 6< 0.01 ppb
(< .01 to 0.0005 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 New Hampshire

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

Violation TypeNumber of Violations
Failure to monitor regularly38