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EWG's Tap Water Database — 2021 UPDATE

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Chloromethane

California Water Service - Livermore

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

 

66

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND180ND
2015ND90ND
2016ND40ND
2017ND70ND
2018ND200ND
2019ND80ND

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
2014-01-16201401170417AMND
2014-04-09201404100750AMND
2014-04-09201404100776AMND
2014-04-16201404220198AMND
2014-04-16201404220190AMND
2014-04-23201404240616AMND
2014-05-07201405080516AMND
2014-07-22201407250232AMND
2014-07-22201407250139AMND
2014-08-069590-010-1120ND
2014-08-069590-024-1135ND
2014-08-069590-025-1127ND
2014-10-159590-008-1035ND
2014-10-159590-022-1044ND
2014-10-159590-023-1039ND
2014-10-16201410170104AMND
2014-11-24201411250338AMND
2014-12-189590-009-1355ND
2015-01-13201501140678AMND
2015-02-18201502190939AMND
2015-02-18201502191035AMND
2015-03-25201503260897AMND
2015-04-21201504220608AMND
2015-05-129590-008-1215ND
2015-05-129590-022-1226ND
2015-05-129590-023-1221ND
2015-12-15201512160548AMND
2016-01-18201601190225AMND
2016-12-135810-010-1305ND
2016-12-135810-024-1307ND
2016-12-135810-025-1306ND
2017-02-079590-023-1411ND
2017-02-079590-008-1412ND
2017-02-079590-022-1411ND
2017-11-145810-022-1315ND
2017-11-145810-008-1305ND
2017-11-145810-023-1310ND
2017-12-189590-007-1359ND
2018-04-125810-025-1303ND
2018-04-125810-023-1333ND
2018-04-125810-008-1330ND
2018-04-125810-010-1301ND
2018-04-125810-024-1305ND
2018-04-125810-022-1336ND
2018-05-019590-021-1438ND
2018-07-025810-022-1136ND
2018-07-025810-023-1140ND
2018-07-025810-008-1134ND
2018-07-115810-024-1400ND
2018-07-115810-025-1402ND
2018-07-115810-010-1356ND
2018-10-165810-021-1337ND
2018-12-115810-022-1452ND
2018-12-115810-008-1515ND
2018-12-115810-023-1458ND
2018-12-125810-024-1326ND
2018-12-125810-025-1329ND
2018-12-125810-010-1314ND
2019-01-085810-022-1405ND
2019-01-085810-008-1345ND
2019-01-085810-010-0955ND
2019-01-085810-025-1005ND
2019-01-085810-023-1400ND
2019-01-085810-024-1010ND
2019-01-239590-021-1150ND
2019-04-045810-013-1250ND