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National Drinking Water Database


Bromodichloromethane in Maine


Bromodichloromethane is a disinfection byproduct from the trihalomethane (THM) family, and is formed when chlorine, chloramines or other disinfectants react with organic and inorganic matter in water. [read more]

The Most Polluted Communities in Maine

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

Ranked by highest average Bromodichloromethane level

RankSystem Population Served Positive test results of total reported tests Average Level
(Range)
1Stonington Water Company
Stonington, ME
60320 of 2013.9 ppb
(3.5 to 42 ppb)
2Southwest Harbor Water Dept.
Southwest Harbor, ME
2,38016 of 167.91 ppb
(4.3 to 12 ppb)
3Brunswick / Topsham Water Dist
Brunswick, ME
16,98824 of 277.88 ppb
(0 to 14.7 ppb)
4Boothbay Region Water District
Boothbay, ME
7,50024 of 247.4 ppb
(4.45 to 10 ppb)
5Pittsfield Water Dept.
Pittsfield, ME
3,1433 of 37.4 ppb
(5.9 to 8.4 ppb)
6Vinalhaven Water Dist
Rockport, ME
1,0431 of 16.2 ppb
(6.2 ppb)
7Town of Bar Harbor- Water Division
Bar Harbor, ME
4,28022 of 246.17 ppb
(0 to 9.1 ppb)
8Passamaquoddy Water District
Eastport, ME
1,87021 of 236.05 ppb
(0 to 10 ppb)
9North Haven Water Department
North Haven, ME
29314 of 255.86 ppb
(0 to 14 ppb)
10Great Salt Bay Sanitary Dist
Damariscotta, ME
1,6737 of 75.51 ppb
(2.7 to 10.4 ppb)

Health Based Limits for Bromodichloromethane

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
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.0.55 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.0.55 ppb
One in one million (10-6) Cancer RiskThe concentration of a chemical in drinking water corresponding to an excess estimated lifetime cancer risk of 1 in 1,000,000. Source: U.S. Environmental Protection Agency.1 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.60 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.80 ppb
One in ten thousand (10-4) Cancer RiskThe concentration of a chemical in drinking water corresponding to an excess estimated lifetime cancer risk of 1 in 10,000. Source: U.S. Environmental Protection Agency.100 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.100 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.1000 ppb

Violation Summary for Bromodichloromethane in Maine

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

Violation TypeNumber of Violations
Failure to monitor regularly13