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EWG's Tap Water Database — 2019 UPDATE

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Monochloroacetic acid

Williams Water Supply

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.

 

24

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND40ND
2013ND40ND
2014ND40ND
2015ND40ND
2016ND40ND
2017ND40ND

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
2012-02-061886466ND
2012-05-081902320ND
2012-08-131924022ND
2012-10-021936663ND
2013-01-211958641ND
2013-04-031970232ND
2013-08-071996322ND
2013-11-122018302ND
2014-02-102034471ND
2014-05-052049990ND
2014-08-042069051ND
2014-11-102092250ND
2015-02-04OE212991ND
2015-05-04OE238935ND
2015-08-05OE277066ND
2015-11-09OE316160ND
2016-02-01OE342177ND
2016-05-04OE374540ND
2016-08-08OE412985ND
2016-11-02OE448647ND
2017-02-01OE477012ND
2017-08-02OE545801ND
2017-10-10OE577574ND
2017-11-09OE588868ND