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EWG's Tap Water Database — 2019 UPDATE

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Chloromethane

City of San Clemente

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.

 

18

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND10ND
2013ND40ND
2014ND60ND
2015ND30ND
2016ND20ND
2017ND20ND

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
2012-01-181805-021-1020ND
2013-09-113I11048-03AND
2013-09-113I11048-01AND
2013-12-093L09134-03AND
2013-12-093L09134-01AND
2014-03-104C10057-03AND
2014-03-104C10057-01AND
2014-03-121805-021-0925ND
2014-04-091805-004-1010ND
2014-06-184F18051-01AND
2014-06-184F18051-03AND
2015-03-111805-021-1105ND
2015-07-295G29085-01AND
2015-12-025L02070-01AND
2016-03-111805-021-1045ND
2016-05-171805-004-1040ND
2017-03-081805-021-1120ND
2017-05-011805-004-0000ND