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EWG's Tap Water Database — 2021 UPDATE

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Chloromethane

City of Katy

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

 

45

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013ND60ND
2014ND70ND
2015ND70ND
2016ND80ND
2017ND60ND
2018ND60ND
2019ND50ND

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
2013-09-23Q1307878001ND
2013-09-23Q1307878007ND
2013-09-23Q1307878003ND
2013-09-23Q1307878009ND
2013-09-23Q1307878005ND
2013-09-23Q1307878011ND
2014-03-24Q1409292007ND
2014-03-24Q1409292005ND
2014-03-24Q1409292011ND
2014-03-24Q1409292009ND
2014-03-24Q1409292003ND
2014-03-24Q1409292001ND
2014-07-25AC61114ND
2015-01-20AC76792ND
2015-01-20AC76782ND
2015-01-20AC76772ND
2015-01-20AC76776ND
2015-01-20AC76774ND
2015-05-28AC93621ND
2015-05-28AC93617ND
2016-01-14AD18231ND
2016-01-14AD18225ND
2016-01-14AD18223ND
2016-01-14AD18263ND
2016-01-14AD18229ND
2016-03-15AD28802ND
2016-07-18AD44547ND
2016-10-07AD52842ND
2017-02-09AD70006ND
2017-02-09AD69940ND
2017-02-09AD69942ND
2017-02-09AD69952ND
2017-02-09AD69938ND
2017-02-09AD69958ND
2018-01-08AE08054ND
2018-01-08AE08058ND
2018-01-08AE08056ND
2018-01-08AE08060ND
2018-01-08AE08062ND
2018-01-08AE08052ND
2019-01-14AE49623ND
2019-01-14AE49613ND
2019-01-14AE49629ND
2019-01-14AE49617ND
2019-01-14AE49615ND