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EWG's Tap Water Database — 2021 UPDATE

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Chloromethane

Golden State Water Company (GSWC) - South Arcadia

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

 

61

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013ND50ND
2014ND130ND
2015ND70ND
2016ND100ND
2017ND70ND
2018ND70ND
2019ND120ND

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
2013-12-183L19003-03AND
2013-12-183L19003-05AND
2013-12-183L19003-07AND
2013-12-183L19003-01AND
2013-12-183L19003-09AND
2014-02-269588-005-1110ND
2014-05-159588-006-1015ND
2014-05-159588-004-1125ND
2014-06-244F24039-07AND
2014-06-244F24039-09AND
2014-06-244F24039-03AND
2014-06-244F24039-01AND
2014-06-244F24039-05AND
2014-08-289588-003-1020ND
2014-08-289588-014-1025ND
2014-08-289588-006-1100ND
2014-11-059588-015-0955ND
2014-11-059588-002-1035ND
2015-02-199588-005-1005ND
2015-05-199588-004-0935ND
2015-08-149588-014-1115ND
2015-08-149588-006-1045ND
2015-08-149588-003-1005ND
2015-11-179588-002-0950ND
2015-11-179588-015-1015ND
2016-03-229588-005-1110ND
2016-05-119588-004-1030ND
2016-08-080007-002-1115ND
2016-08-080007-003-1051ND
2016-08-080007-004-1107ND
2016-08-199588-014-0850ND
2016-08-199588-003-1055ND
2016-08-199588-006-0920ND
2016-11-179588-015-1100ND
2016-11-179588-002-1005ND
2017-02-169588-005-1120ND
2017-05-169588-004-1020ND
2017-08-109588-014-1055ND
2017-08-109588-003-1000ND
2017-08-109588-006-1035ND
2017-11-299588-015-1015ND
2017-11-299588-002-0945ND
2018-02-149588-005-1010ND
2018-05-179588-004-1005ND
2018-08-169588-006-1115ND
2018-08-169588-003-1015ND
2018-08-169588-014-1100ND
2018-11-299588-015-1220ND
2018-11-299588-002-1050ND
2019-02-229588-005-0910ND
2019-04-229590-015-1126ND
2019-04-229590-015-1121ND
2019-04-229590-015-1116ND
2019-04-229590-015-1111ND
2019-04-229590-015-1106ND
2019-05-229588-004-1130ND
2019-08-149588-014-1150ND
2019-08-149588-003-1030ND
2019-08-149588-006-1135ND
2019-11-129588-015-1240ND
2019-11-129588-002-1115ND