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EWG's Tap Water Database — 2021 UPDATE

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Chloromethane

City of Friendswood

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

 

42

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013ND150ND
2014ND30ND
2015ND40ND
2016ND60ND
20171.15 ppb42ND - 2.30 ppb
2018ND40ND
2019ND60ND

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
2013-05-011305094-009END
2013-05-011305094-001END
2013-05-011305094-011END
2013-05-011305094-013END
2013-05-011305094-003END
2013-05-011305094-007END
2013-05-011305094-005END
2013-08-22Q1306099001ND
2013-11-14Q1313371009ND
2013-11-14Q1313371011ND
2013-11-14Q1313371013ND
2013-11-14Q1313371001ND
2013-11-14Q1313371005ND
2013-11-14Q1313371003ND
2013-11-14Q1313371007ND
2014-02-18Q1404903001ND
2014-02-20AC43875ND
2014-02-20AC43867ND
2015-02-05AC79506ND
2015-02-05AC79512ND
2015-02-05AC79510ND
2015-02-05AC79514ND
2016-02-04AD22119ND
2016-02-04AD22173ND
2016-02-04AD22161ND
2016-02-04AD22177ND
2016-09-28AD51724ND
2016-10-26AD54839ND
2017-01-19AD657212.30 ppb
2017-01-19AD657232.30 ppb
2017-01-19AD65743ND
2017-05-03AD82490ND
2018-01-29AE11006ND
2018-05-21AE27042ND
2018-05-21AE27044ND
2018-09-17AE40251ND
2019-02-04AE52712ND
2019-02-04AE52710ND
2019-02-04AE52716ND
2019-02-04AE52718ND
2019-04-22AE63211ND
2019-07-15AE74435ND