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EWG's Tap Water Database — 2019 UPDATE

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Chloromethane

San Antonio Water System Northeast

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.

 

23

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND30ND
2013ND60ND
2014ND80ND
2015ND40ND
2016N/A00N/A
2017ND20ND

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
2012-05-211205665012ND
2012-05-211205665010ND
2012-05-211205665008ND
2013-10-08201310110246AMND
2013-10-08201310110242AMND
2013-10-08201310110244AMND
2013-10-08201310110248AMND
2013-10-08201310110250AMND
2013-11-21AC35848ND
2014-01-24201401270007AMND
2014-04-14201404150335AMND
2014-04-14201404150337AMND
2014-04-14201404150333AMND
2014-04-14201404150345AMND
2014-04-15201404160660AMND
2014-07-25201407260066AMND
2014-09-02AC65451ND
2015-07-08AC98749ND
2015-07-08AC98753ND
2015-07-08AC98747ND
2015-07-09AC98996ND
2017-12-04AE06578ND
2017-12-13AE07674ND