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EWG's Tap Water Database — 2021 UPDATE

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Chloromethane

Placer County Water Agency - Foothill

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.

 

15

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND80ND
2015ND20ND
2016N/A00N/A
2017N/A00N/A
2018ND20ND
2019ND30ND

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
2014-03-04201403050497AMND
2014-06-10201406110961AMND
2014-06-10201406110959AMND
2014-08-203334-002-1010ND
2014-08-203334-007-1200ND
2014-09-02201409030609AMND
2014-09-02201409030611AMND
2014-12-10201412110730AMND
2015-08-113334-002-1000ND
2015-08-113334-007-1305ND
2018-08-143334-002-1120ND
2018-08-143334-007-1310ND
2019-08-273334-002-0000ND
2019-09-093334-007-1330ND
2019-09-123334-014-1150ND