The Power of Information

National Drinking Water Database


Chloromethane in New York


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 New York

65 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)
1Hyde Park Terrace Apartments
Poughkeepsie, NY
701 of 117 ppb
(17 ppb)
2Crestview Manor Mhp
Carmel, NY
801 of 15.9 ppb
(5.9 ppb)
3Houghton Water District
Caneadea, NY
2,0002 of 33.7 ppb
(0 to 8.5 ppb)
4Richland Town Pws
NY
2,3505 of 83.53 ppb
(0 to 13 ppb)
5Millbrook School
Millbrook, NY
2251 of 13.45 ppb
(3.45 ppb)
6Alpine Manor Home For Adults
Lima, NY
401 of 12.6 ppb
(2.6 ppb)
7Hunters Creek Mobile Home Park
Buffalo, NY
1506 of 142.5 ppb
(0 to 15.98 ppb)
8Winchester Estates
Duke Center, NY
321 of 12 ppb
(2 ppb)
9Modena Country Club
Modena, NY
2451 of 11.54 ppb
(1.54 ppb)
10Wappingers Falls Mobile Home P
Wappingers Falls, NY
1151 of 11.5 ppb
(1.5 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 New York

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

Violation TypeNumber of Violations
Failure to monitor regularly176
Over maximum contaminant level, Average1
Over maximum contaminant level, Single Sample1