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EWG's Tap Water Database — 2021 UPDATE

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Chloromethane

Clear Lake City Water Authority

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
2013ND180ND
2014ND50ND
2015ND40ND
2016ND40ND
2017ND50ND
2018ND30ND
2019ND30ND

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
2013-04-09713556-8572ND
2013-04-09713558-8572ND
2013-04-09713562-8572ND
2013-04-09713554-8572ND
2013-04-09713542-8572ND
2013-04-09713560-8572ND
2013-04-09713544-8572ND
2013-07-10730585-9308ND
2013-07-10730593-9308ND
2013-07-10730591-9308ND
2013-07-10730595-9308ND
2013-10-08751275-10019ND
2013-10-08751296-10003ND
2013-10-08751262-10003ND
2013-10-08751367-10019ND
2013-10-08751283-10003ND
2013-10-08751267-10003ND
2013-10-08751277-10003ND
2014-01-08765714-10539ND
2014-01-08765736-10539ND
2014-01-08765716-10539ND
2014-01-08765722-10539ND
2014-02-26AC44797ND
2015-01-20AC76760ND
2015-01-20AC76766ND
2015-01-20AC76770ND
2015-01-20AC76758ND
2016-01-19AD18636ND
2016-01-19AD18634ND
2016-06-20AD41195ND
2016-06-20AD41193ND
2017-01-19AD65733ND
2017-03-08AD74033ND
2017-03-08AD74031ND
2017-03-08AD74035ND
2017-10-25AE02122ND
2018-02-20AE14467ND
2018-03-12AE17898ND
2018-04-24AE23717ND
2019-02-27AE56279ND
2019-02-27AE56261ND
2019-02-27AE56283ND