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EWG's Tap Water Database — 2019 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.

 

55

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND60ND
2013ND120ND
2014ND130ND
2015ND70ND
2016ND100ND
2017ND70ND

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
2012-02-099588-005-1105ND
2012-08-169588-003-0945ND
2012-08-169588-006-0915ND
2012-08-169588-014-0850ND
2012-08-169588-015-0935ND
2012-11-169588-002-1000ND
2013-02-219588-005-1005ND
2013-05-159588-004-1020ND
2013-08-149588-003-1130ND
2013-08-149588-006-1200ND
2013-08-149588-014-1225ND
2013-08-289588-015-1135ND
2013-11-149588-002-1055ND
2013-12-183L19003-07AND
2013-12-183L19003-09AND
2013-12-183L19003-01AND
2013-12-183L19003-05AND
2013-12-183L19003-03AND
2014-02-269588-005-1110ND
2014-05-159588-006-1015ND
2014-05-159588-004-1125ND
2014-06-244F24039-09AND
2014-06-244F24039-07AND
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
2014-11-059588-002-1035ND
2014-11-059588-015-0955ND
2015-02-199588-005-1005ND
2015-05-199588-004-0935ND
2015-08-149588-003-1005ND
2015-08-149588-014-1115ND
2015-08-149588-006-1045ND
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
2016-08-199588-006-0920ND
2016-08-199588-003-1055ND
2016-08-199588-014-0850ND
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
2017-11-299588-002-0945ND
2017-11-299588-015-1015ND