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EWG's Tap Water Database — 2021 UPDATE

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Chloromethane

City of Rosenberg

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

 

35

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND70ND
2015ND110ND
2016ND40ND
2017ND50ND
2018ND50ND
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
2014-01-21AC39520ND
2014-09-08Q1441916001ND
2014-09-08Q1441916003ND
2014-09-08Q1441916007ND
2014-09-08Q1441916009ND
2014-09-08Q1441916011ND
2014-09-08Q1441916005ND
2015-03-16Q1509420005ND
2015-03-16Q1509420007ND
2015-03-16Q1509420011ND
2015-03-16Q1509420009ND
2015-03-16Q1509420003ND
2015-03-16Q1509420001ND
2015-03-25AC86068ND
2015-03-25AC86064ND
2015-03-25AC86066ND
2015-03-25AC86058ND
2015-05-05AC90568ND
2016-01-26AD20142ND
2016-01-26AD20114ND
2016-01-26AD20110ND
2016-01-26AD20136ND
2017-03-14AD74885ND
2017-03-14AD74917ND
2017-03-14AD74943ND
2017-05-31AD86151ND
2017-05-31AD86153ND
2018-03-05AE16646ND
2018-03-05AE16648ND
2018-03-05AE16654ND
2018-03-05AE16660ND
2018-05-21AE27018ND
2019-04-02AE60873ND
2019-04-02AE60883ND
2019-04-02AE60877ND