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EWG's Tap Water Database — 2021 UPDATE

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Chloromethane

City of La Porte

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

 

47

Samples

0

Samples exceeding legal limit (MCL)

3

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND10ND
2015ND220ND
2016ND60ND
20171.75 ppb63ND - 4.30 ppb
2018ND60ND
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
2014-03-19AC47589ND
2015-01-26AC77585ND
2015-01-26AC77583ND
2015-01-26AC77595ND
2015-01-26AC77591ND
2015-01-26AC77593ND
2015-01-26AC77607ND
2015-02-24Q1507111003ND
2015-02-24Q1507111007ND
2015-02-24Q1507111005ND
2015-02-24Q1507111011ND
2015-02-24Q1507111001ND
2015-02-24Q1507111009ND
2015-02-24Q1507111013ND
2015-05-19Q1518293001ND
2015-09-02Q1533768003ND
2015-09-02Q1533768001ND
2015-09-02Q1533768007ND
2015-09-02Q1533768005ND
2015-09-02Q1533768011ND
2015-09-02Q1533768009ND
2015-09-02Q1533768013ND
2015-11-17Q1545123001ND
2016-01-20AD18950ND
2016-01-20AD18946ND
2016-01-20AD18962ND
2016-01-20AD18988ND
2016-01-20AD18968ND
2016-04-12AD32819ND
2017-01-18AD65407ND
2017-01-18AD653774.30 ppb
2017-01-18AD654012.90 ppb
2017-01-18AD65403ND
2017-01-18AD653993.30 ppb
2017-01-18AD65383ND
2018-01-29AE11024ND
2018-01-29AE10994ND
2018-01-29AE11056ND
2018-01-29AE10996ND
2018-01-29AE11048ND
2018-01-29AE11032ND
2019-01-09AE49193ND
2019-01-09AE49199ND
2019-01-09AE49203ND
2019-01-09AE49195ND
2019-01-09AE49197ND
2019-01-09AE49201ND