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EWG's Tap Water Database — 2021 UPDATE

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Chloromethane

Downey Water Department

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

 

51

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014N/A00N/A
2015ND90ND
2016N/A00N/A
2017ND10ND
2018ND230ND
2019ND180ND

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
2015-02-24B5B2374-10ND
2015-02-24B5B2374-04ND
2015-02-24B5B2374-01ND
2015-02-24B5B2374-07ND
2015-02-24B5B2374-13ND
2015-08-13B5H1452-04ND
2015-08-13B5H1452-01ND
2015-08-13B5H1452-10ND
2015-08-13B5H1452-07ND
2017-12-129588-033-1042ND
2018-02-139588-005-1105ND
2018-02-139588-033-1220ND
2018-02-139588-016-1132ND
2018-02-139588-014-1255ND
2018-02-139588-032-1020ND
2018-02-139588-011-1200ND
2018-02-139588-010-0945ND
2018-02-139588-009-0930ND
2018-02-139588-007-0900ND
2018-02-149588-030-1020ND
2018-02-149588-017-1136ND
2018-02-149588-029-1039ND
2018-02-149588-026-1059ND
2018-02-149588-020-1206ND
2018-02-149588-024-1226ND
2018-02-219588-019-1000ND
2018-02-219588-021-1047ND
2018-02-219588-018-0925ND
2018-03-149588-012-1131ND
2018-03-269588-025-1035ND
2018-05-019588-019-1159ND
2018-10-239588-018-1314ND
2018-11-069588-012-1045ND
2019-01-159588-032-0755ND
2019-01-249588-025-0730ND
2019-01-249588-029-0905ND
2019-01-249588-030-0822ND
2019-01-259588-021-0840ND
2019-01-259588-026-0806ND
2019-01-259588-020-0938ND
2019-01-259588-010-1008ND
2019-01-259588-009-1026ND
2019-01-259588-005-1048ND
2019-01-309588-033-0735ND
2019-01-309588-019-0820ND
2019-01-309588-011-1030ND
2019-01-319588-024-0820ND
2019-01-319588-017-1015ND
2019-01-319588-016-0930ND
2019-01-319588-014-1000ND
2019-09-309588-033-0830ND