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EWG's Tap Water Database — 2021 UPDATE

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Chloromethane

City of South Houston

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.

 

25

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.0480 ppb751ND - 3.60 ppb
2015ND50ND
2016ND50ND
2017ND50ND
2018ND50ND
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
2015-01-21AC77109ND
2015-01-21AC77099ND
2015-01-21AC77093ND
2015-01-21AC77095ND
2015-01-21AC77101ND
2016-01-14AD18215ND
2016-01-14AD18219ND
2016-01-14AD18221ND
2016-01-14AD18205ND
2016-01-14AD18207ND
2017-01-06AD63617ND
2017-03-01AD72765ND
2017-03-01AD72753ND
2017-03-01AD72763ND
2017-03-01AD72785ND
2018-01-30AE11273ND
2018-01-30AE11279ND
2018-01-30AE11281ND
2018-01-30AE11275ND
2018-01-30AE11277ND
2019-02-05AE52937ND
2019-02-05AE52939ND
2019-02-05AE52913ND
2019-02-05AE52915ND
2019-02-05AE52943ND