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EWG's Tap Water Database — 2021 UPDATE

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Chloromethane

City of Fremont

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.

 

53

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013ND50ND
2014ND140ND
2015ND130ND
2016ND70ND
2017ND30ND
2018ND30ND
2019ND80ND

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
2013-09-16745361-9786ND
2013-09-16745236-9726ND
2013-09-16745238-9726ND
2013-09-16745306-9786ND
2013-09-16745300-9726ND
2014-03-05773395-10870ND
2014-03-05773393-10870ND
2014-03-05773391-10870ND
2014-03-05773397-10870ND
2014-03-05773399-10870ND
2014-05-05294530ND
2014-09-15324195ND
2014-09-15324196ND
2014-09-15324197ND
2014-09-15324198ND
2014-10-27332949ND
2014-10-27332950ND
2014-10-27332951ND
2014-10-27332952ND
2015-03-04348743ND
2015-03-04348740ND
2015-03-04348741ND
2015-03-04348742ND
2015-04-29353685ND
2015-06-08364979ND
2015-06-08364980ND
2015-06-08364981ND
2015-06-08364982ND
2015-09-09378769ND
2015-09-09378766ND
2015-09-09378767ND
2015-09-09378768ND
2016-05-04ND
2016-06-01ND
2016-06-01ND
2016-09-14ND
2016-09-14ND
2016-09-14ND
2016-09-26ND
2017-04-26ND
2017-09-12ND
2017-09-12ND
2018-06-11542840ND
2018-09-17571932ND
2018-09-17571933ND
2019-04-29604841ND
2019-04-29604842ND
2019-07-29621293ND
2019-08-19619939ND
2019-09-03630420ND
2019-09-03630421ND
2019-12-04638582ND
2019-12-04619940ND