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National Drinking Water Database


Tetrachloroethylene in Connecticut


Tetrachloroethylene (perc) is a common soil and groundwater contaminant used in dry cleaning and as a solvent in automotive and metalworking factories and other industries. [read more]

The Most Polluted Communities in Connecticut

19 water utilities reported detecting Tetrachloroethylene in tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies

Ranked by highest average Tetrachloroethylene level

RankSystem Population Served Positive test results of total reported tests Average Level
(Range)
1Meriden Water Division
Meriden, CT
58,44120 of 293.9 ppb
(0 to 15 ppb)
2Valley Water Systems, Inc.
Plainville, CT
17,07815 of 162.24 ppb
(0 to 12.85 ppb)
3Hill Hollow Association
Middletown, CT
481 of 41.68 ppb
(0 to 6.7 ppb)
4East Hampton Wpca - Village Center
East Hampton, CT
3661 of 110.99 ppb
(0 to 10.9 ppb)
5Connecticut Correctional Institute
Somers, CT
5,4601 of 190.79 ppb
(0 to 15 ppb)
6Southington Water Department
Southington, CT
40,4086 of 180.68 ppb
(0 to 3.05 ppb)
7Rollingwood Condominiums
Bethel, CT
6466 of 90.65 ppb
(0 to 1.3 ppb)
8Olmstead Water Supply Co-Possum Ridge
Watertown, CT
3202 of 30.4 ppb
(0 to 0.8 ppb)
9Bradley Home
Meriden, CT
1354 of 100.39 ppb
(0 to 1.3 ppb)
10Sandy Lane Village Condominium Assn
Brookfield, CT
3181 of 40.33 ppb
(0 to 1.3 ppb)

Health Based Limits for Tetrachloroethylene

StandardDescriptionLevel
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.0 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.0.06 ppb
EPA Human Health Water Quality CriteriaWater quality criteria set by the US EPA provide guidance for states and tribes authorized to establish water quality standards under the Clean Water Act (CWA) to protect human health. These are non-enforceable standards based upon exposure by both drinking water and the contribution of water contamination to other consumed foods. Source: U.S. Environmental Protection Agency.0.69 ppb
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.5 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.10 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.500 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.2000 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.2000 ppb

Violation Summary for Tetrachloroethylene in Connecticut

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

Violation TypeNumber of Violations
Failure to monitor regularly75