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EWG's Tap Water Database — 2021 UPDATE

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Monochloroacetic acid

Mount Ida

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

 

50

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.738 ppb82ND - 3.50 ppb
2015ND80ND
20160.488 ppb81ND - 3.90 ppb
20170.713 ppb82ND - 2.90 ppb
20180.438 ppb81ND - 3.50 ppb
20192.38 ppb106ND - 5.70 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
2014-01-0814010005401ND
2014-01-0814010005301ND
2014-04-0314094004201ND
2014-04-1514107003501ND
2014-07-02141840059012.40 ppb
2014-08-0414219011801ND
2014-10-0714282017001ND
2014-11-04143100037013.50 ppb
2015-01-0715008012401ND
2015-01-0715008012301ND
2015-04-0615099001701ND
2015-04-0615099001801ND
2015-07-0715191002301ND
2015-07-0715191002401ND
2015-10-0615281008301ND
2015-10-0615281008201ND
2016-01-0416008005101ND
2016-01-0416008005001ND
2016-04-0416098009101ND
2016-04-0416098009201ND
2016-07-0516189016801ND
2016-07-05161890169013.90 ppb
2016-10-0316280010701ND
2016-10-0316280010801ND
2017-01-0317005016801ND
2017-01-0317005016701ND
2017-04-05170960133012.80 ppb
2017-04-05170960134012.90 ppb
2017-07-0417187011601ND
2017-07-0417187011501ND
2017-10-0217277002001ND
2017-10-0217277001901ND
2018-01-0318004011401ND
2018-01-03180040113013.50 ppb
2018-04-0318095013001ND
2018-05-0918130007501ND
2018-07-0218186014501ND
2018-07-0218186014401ND
2018-10-0318277002001ND
2018-10-0318277001901ND
2019-01-02190040008013.10 ppb
2019-01-02190040007013.80 ppb
2019-04-0319095000901ND
2019-04-0319095000801ND
2019-08-20192330049012.20 ppb
2019-08-2019233004801ND
2019-09-16192610005014.00 ppb
2019-09-1619261000401ND
2019-10-03192760086015.00 ppb
2019-10-03192760085015.70 ppb