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EWG's Tap Water Database — 2021 UPDATE

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Chloromethane

California Water Service - Stockton

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

 

65

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND320ND
2015ND70ND
2016ND30ND
2017ND30ND
2018ND130ND
2019ND70ND

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
2014-01-09201401100158AMND
2014-01-09201401100117AMND
2014-01-09201401100143AMND
2014-01-14201401150323AMND
2014-01-14201401150487AMND
2014-01-14201401150650AMND
2014-01-16201401170408AMND
2014-01-16201401170453AMND
2014-01-16201401170466AMND
2014-01-22201401230168AMND
2014-04-21201404220356AMND
2014-04-21201404220291AMND
2014-04-299590-018-1015ND
2014-04-299590-018-1150ND
2014-07-07201407090857AMND
2014-07-08201407090710AMND
2014-07-08201407090774AMND
2014-07-08201407090771AMND
2014-07-08201407090791AMND
2014-07-14201407150431AMND
2014-07-15201407160584AMND
2014-07-15201407160567AMND
2014-07-15201407160595AMND
2014-07-23201407240452AMND
2014-08-125810-131-1340ND
2014-08-125810-069-1325ND
2014-08-135810-125-0955ND
2014-08-135810-063-1029ND
2014-10-08201410090339AMND
2014-10-08201410090370AMND
2014-10-139590-063-1550ND
2014-10-139590-125-1318ND
2015-01-07201501080584AMND
2015-05-129590-063-1035ND
2015-05-129590-125-1020ND
2015-06-03201506040498AMND
2015-08-161610-133-1900ND
2015-09-16201509170575AMND
2015-11-195810-059-1048ND
2016-08-095810-125-1030ND
2016-08-095810-063-1050ND
2016-12-065810-015-1014ND
2017-03-085810-063-1115ND
2017-03-085810-125-1050ND
2017-11-085810-052-0930ND
2018-04-119590-051-1340ND
2018-04-119590-133-1035ND
2018-06-145810-069-1340ND
2018-06-145810-059-1510ND
2018-06-145810-131-1355ND
2018-06-145810-060-1515ND
2018-07-105810-063-1250ND
2018-07-105810-125-1230ND
2018-10-165810-133-1155ND
2018-10-245810-050-1425ND
2018-11-265810-062-1305ND
2018-12-045810-063-1305ND
2018-12-045810-125-1315ND
2019-01-085810-063-1018ND
2019-01-085810-125-1030ND
2019-01-225810-061-1012ND
2019-01-225810-133-1200ND
2019-02-265810-062-1150ND
2019-04-155810-133-1155ND
2019-04-155810-050-1335ND