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EWG's Tap Water Database — 2021 UPDATE

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Chloromethane

Cal/Am Water Company - San Marino

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.

MORE ABOUT THIS CONTAMINANT

 

82

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND260ND
2015ND90ND
2016ND170ND
2017ND80ND
2018ND60ND
2019ND160ND

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
2014-03-109588-007-0950ND
2014-05-1225566601ND
2014-05-1325566701ND
2014-05-1325566401ND
2014-05-1325566901ND
2014-05-1325567001ND
2014-05-1425566801ND
2014-05-1425567301ND
2014-05-1925566501ND
2014-06-029588-032-1010ND
2014-07-1425566301ND
2014-08-1226624501ND
2014-09-039588-010-0900ND
2014-09-039588-011-0945ND
2014-09-039588-017-0915ND
2014-09-039588-020-1000ND
2014-09-039588-023-1020ND
2014-11-0427434901ND
2014-11-0527435701ND
2014-11-0527435301ND
2014-11-1027435001ND
2014-11-1027435401ND
2014-11-1227435101ND
2014-11-1227435201ND
2014-11-1227434801ND
2014-11-2427797001ND
2015-02-0228247101ND
2015-03-209588-007-0715ND
2015-03-209590-007-0920ND
2015-06-049588-032-1000ND
2015-09-089588-023-0950ND
2015-09-089588-020-0935ND
2015-09-089588-011-1020ND
2015-09-089588-017-1035ND
2015-09-089588-010-0915ND
2016-03-029588-007-0915ND
2016-06-099588-032-1005ND
2016-08-309590-044-0945ND
2016-09-079588-017-1020ND
2016-09-079588-011-1105ND
2016-09-079588-023-1120ND
2016-09-079588-010-0945ND
2016-09-079588-020-1130ND
2016-09-279590-044-0940ND
2016-10-039590-044-0945ND
2016-10-109590-044-0945ND
2016-10-179590-044-1015ND
2016-10-249590-044-1010ND
2016-11-019590-044-1150ND
2016-11-079590-044-0850ND
2016-11-149590-044-0830ND
2016-11-219590-044-0930ND
2017-03-019588-007-0900ND
2017-05-159590-044-0930ND
2017-05-159590-049-0930ND
2017-06-089588-032-1045ND
2017-09-209588-020-1010ND
2017-09-209588-017-0920ND
2017-09-209588-010-0900ND
2017-09-209588-023-0955ND
2018-01-049590-007-1000ND
2018-03-069588-007-0920ND
2018-06-149588-032-1100ND
2018-09-209588-023-1020ND
2018-09-209588-020-1040ND
2018-09-209588-017-0950ND
2019-03-199588-007-1025ND
2019-05-139588-017-1015ND
2019-05-139588-023-0945ND
2019-05-139588-020-0930ND
2019-05-139588-032-0955ND
2019-05-159590-006-1130ND
2019-05-159590-029-0845ND
2019-05-159590-044-0925ND
2019-06-189588-011-1005ND
2019-08-079588-011-1000ND
2019-08-269588-010-0945ND
2019-10-049590-049-1005ND
2019-10-049590-044-0958ND
2019-12-239590-044-0830ND
2019-12-239590-049-0830ND
2019-12-319590-049-0931ND