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EWG's Tap Water Database — 2021 UPDATE

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Chloromethane

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Chloromethane is an industrial solvent, aerosol propellant and a refrigerant. It also forms as a byproduct of water disinfection. The EPA classifies chloromethane as possibly carcinogenic to humans.

 

34

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND100ND
2015ND70ND
2016ND80ND
2017ND90ND
2018N/A00N/A
2019N/A00N/A

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 2.69 ppb

The EWG Health Guideline of 2.69 ppb for chloromethane was defined by the Environmental Protection Agency as a benchmark for testing under the Unregulated Contaminant Monitoring Rule program. This health guideline protects against cancer.

ppb = parts per billion

All test results

Date Lab ID Result
2014-01-1014011274-007ND
2014-01-1014011274-006ND
2014-04-0714041281-003ND
2014-04-0714041281-002ND
2014-07-2214072525-003ND
2014-07-2214072525-002ND
2014-07-2414073039-006ND
2014-07-2414073039-005ND
2014-10-1514100973-005ND
2014-10-1514100973-004ND
2015-01-0615010268-002ND
2015-01-23V5A0814-02ND
2015-04-022063807002ND
2015-04-022063807003ND
2015-07-302086712001ND
2015-10-092101217001ND
2015-11-162108987001ND
2016-01-042117299001ND
2016-01-042117300001ND
2016-06-162152721001ND
2016-06-202153529001ND
2016-08-302171453001ND
2016-08-302171453003ND
2016-12-122195431001ND
2016-12-122195433001ND
2017-01-162202442002ND
2017-01-162202442001ND
2017-06-122238058001ND
2017-06-122238057001ND
2017-08-112254412001ND
2017-08-112254413001ND
2017-11-072275541001ND
2017-11-142277314001ND
2017-11-142277313001ND