The Power of Information

National Drinking Water Database


Chloromethane in Maine


Chloromethane is a naturally occuring chemical that forms during combustion of plant material; it may be released from the manufacture of silicone, rubber and pesticides, and also forms as a byproduct of water disinfection.

The Most Polluted Communities in Maine

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

Ranked by highest average Chloromethane level

RankSystem Population Served Positive test results of total reported tests Average Level
(Range)
1St Francis Water District
St Francis, ME
801 of 71.34 ppb
(0 to 9.4 ppb)
2Averills Mobile Home Park
Benton, ME
781 of 10.68 ppb
(0.68 ppb)
3Dennysville Housing
Machias, ME
341 of 10.56 ppb
(0.56 ppb)
4Cathance Trailer Park
Topsham, ME
1441 of 90.5 ppb
(0 to 4.5 ppb)
5Bingham Water District
Bingham, ME
1,3131 of 20.37 ppb
(0 to 0.73 ppb)
6Great Salt Bay Sanitary Dist
Damariscotta, ME
1,6731 of 20.3 ppb
(0 to 0.6 ppb)
7Town of Bar Harbor- Water Division
Bar Harbor, ME
4,2801 of 20.29 ppb
(0 to 0.57 ppb)
8Whippoorwill Hill Mobile Home
Waterville, ME
851 of 20.25 ppb
(0 to 0.5 ppb)
9Birch Tree Meadows M.H.P.
Ellsworth, ME
1051 of 40.2 ppb
(0 to 0.8 ppb)
10Brook Hollow
Freeport, ME
361 of 40.2 ppb
(0 to 0.8 ppb)

Health Based Limits for Chloromethane

StandardDescriptionLevel
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.30 ppb
Health-Based Screening LevelA benchmark concentration of contaminants in water that may be of potential concern for human health, if exceeded. For noncarcinogens, the HBSL represents the contaminant concentration in drinking water that is not expected to cause any adverse effects over a lifetime of exposure. For carcinogens, the HBSL range represents the contaminant concentration in drinking water that corresponds to an excess estimated lifetime cancer risk of 1 chance in 1 million to 1 chance in 10 thousand. Source: U.S. Geological Survey.30 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 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.400 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.9000 ppb

Violation Summary for Chloromethane 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