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EWG's Tap Water Database — 2021 UPDATE

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Chloromethane

Twin Buttes Water System

NOTE: Twin Buttes Water System purchases water from City of San Angelo which is required to test for chloromethane. Sample information shown below was taken by City of San Angelo.

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

 

21

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND110ND
2015ND10ND
2016ND20ND
2017ND10ND
2018ND10ND
2019ND10ND

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

NOTE: Twin Buttes Water System purchases water from City of San Angelo which is required to test for chloromethane. Sample information shown below was taken by City of San Angelo.

Date Lab ID Result
2013-08-26201308270155AMND
2013-11-25201311260124AMND
2014-02-20201402210248AMND
2014-04-29AC52039ND
2014-04-29AC52069ND
2014-04-29AC52067ND
2014-04-29AC52065ND
2014-04-29AC52063ND
2014-04-29AC52037ND
2014-04-29AC52059ND
2014-04-29AC52071ND
2014-05-20201405210834AMND
2014-08-11AC63095ND
2015-08-12AD03968ND
2016-02-17AD24323ND
2016-05-17AD37069ND
2016-07-20AD45007ND
2016-11-09AD57412ND
2017-05-09Q1719085002ND
2018-02-28Q1808687007ND
2019-05-07Q1920785002ND