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EWG's Tap Water Database — 2021 UPDATE

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Monochloroacetic acid

Northwest Harris County MUD 5

Monochloroacetic acid, one of the group of five haloacetic acids regulated by federal standards, is formed when chlorine or other disinfectants are used to treat drinking water. Haloacetic acids and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy. Click here to read more about disinfection byproducts.

MORE ABOUT THIS CONTAMINANT

 

28

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND20ND
2015ND20ND
2016ND20ND
2017ND60ND
2018ND80ND
20190.925 ppb81ND - 7.40 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 53 ppb

The EWG Health Guideline of 53 ppb for monochloroacetic acid was proposed in 2020 by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk.. This health guideline protects against system toxicity.

ppb = parts per billion

All test results

Date Lab ID Result
2014-06-16AC56980ND
2014-06-16AC56979ND
2015-07-28AD01196ND
2015-07-28AD01199ND
2016-09-19AD49999ND
2016-09-19AD50085ND
2017-06-09AD86988ND
2017-06-09AD86984ND
2017-08-08AD92369ND
2017-08-08AD92370ND
2017-10-18AE01307ND
2017-10-18AE01309ND
2018-02-07AE12726ND
2018-02-07AE12729ND
2018-05-10AE25895ND
2018-05-10AE25896ND
2018-08-01AE35262ND
2018-08-01AE35257ND
2018-11-19AE46451ND
2018-11-19AE46448ND
2019-02-05AE52892ND
2019-02-05AE52895ND
2019-05-20AE670747.40 ppb
2019-05-20AE67092ND
2019-07-19AE75262ND
2019-07-19AE75264ND
2019-10-24AE87555ND
2019-10-24AE87556ND