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EWG's Tap Water Database — 2021 UPDATE

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Chloromethane

Cal-am Water Company - Duarte

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

 

62

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013ND160ND
2014ND80ND
2015ND70ND
2016ND70ND
2017ND70ND
2018ND60ND
2019ND110ND

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
2013-03-0621126801ND
2013-03-0621127101ND
2013-03-0621127001ND
2013-03-1221126901ND
2013-03-1221126401ND
2013-03-1321127201ND
2013-03-1321126501ND
2013-03-1321269901ND
2013-09-1023394201ND
2013-09-1023394801ND
2013-09-1023394901ND
2013-09-1023394301ND
2013-09-1023394401ND
2013-09-1023394601ND
2013-09-1023394701ND
2013-09-1023394501ND
2014-03-109588-004-1140ND
2014-09-039588-002-1055ND
2014-09-039588-008-1120ND
2014-09-039588-007-1240ND
2014-09-039588-010-1225ND
2014-09-039588-003-1215ND
2014-12-039588-019-1020ND
2014-12-039588-009-1100ND
2015-09-089588-010-1110ND
2015-09-089588-008-1120ND
2015-09-089588-007-1215ND
2015-09-089588-003-1140ND
2015-09-089588-002-1200ND
2015-12-079588-009-1130ND
2015-12-079588-019-1040ND
2016-09-079588-002-1330ND
2016-09-079588-003-1305ND
2016-09-079588-007-1245ND
2016-09-079588-008-1345ND
2016-09-079588-010-1315ND
2016-12-059588-009-1135ND
2016-12-059588-019-1105ND
2017-09-209588-002-1150ND
2017-09-209588-007-1100ND
2017-09-209588-008-1125ND
2017-09-209588-010-1210ND
2017-09-289588-003-0905ND
2017-12-059588-009-1030ND
2017-12-059588-019-1000ND
2018-09-209588-002-1300ND
2018-09-209588-008-1240ND
2018-09-209588-010-1325ND
2018-09-209588-007-1215ND
2018-12-189588-019-1055ND
2018-12-189588-009-1150ND
2019-02-069590-022-1230ND
2019-03-199588-003-1135ND
2019-05-139588-022-1310ND
2019-08-079588-007-1145ND
2019-08-079588-002-1250ND
2019-08-079588-019-1115ND
2019-08-079588-022-1325ND
2019-08-079588-008-1220ND
2019-08-079588-009-1210ND
2019-08-079588-010-1305ND
2019-11-199588-022-1040ND