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National Drinking Water Database


Mercury (total inorganic) in Maine


Mercury is a metal from refinery and factory pollution, coal burning, landfill and agricultural runoff and erosion of natural deposits. [read more]

The Most Polluted Communities in Maine

14 water utilities reported detecting Mercury (total inorganic) in tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies

Ranked by highest average Mercury (total inorganic) level

RankSystem Population Served Positive test results of total reported tests Average Level
(Range)
1Bay Bridge Estates, Llc
Brunswick, ME
1,2331 of 20.5 ppb
(0 to 1 ppb)
2Monson Utilities District
Monson, ME
3781 of 30.25 ppb
(0 to 0.75 ppb)
3Harmon Pines Development
Portland, ME
401 of 10.2 ppb
(0.2 ppb)
4Machias Trailer Park
Machias, ME
652 of 20.15 ppb
(0.08 to 0.23 ppb)
5Friendship Water Department
Union, ME
851 of 10.13 ppb
(0.13 ppb)
6Sunrise Hill Trailer Park
Barrington, ME
1051 of 10.1 ppb
(0.1 ppb)
7Hallowell RD Mobile Home Park
S Gardiner, ME
301 of 20.05 ppb
(0 to 0.1 ppb)
8Aqua Maine,inc. Hartland Division
Rockport, ME
9651 of 60.04 ppb
(0 to 0.21 ppb)
9Marshwood Estates
Dover, ME
2251 of 30.03 ppb
(0 to 0.1 ppb)
10South Berwick Water District
South Berwick, ME
3,1153 of 40.03 ppb
(0 to 0.06 ppb)

Health Based Limits for Mercury (total inorganic)

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.1.2 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.2 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.2 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.2 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.2 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.2 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.10 ppb

Violation Summary for Mercury (total inorganic) 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 regularly5