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EWG's Tap Water Database — 2021 UPDATE

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Monochloroacetic acid

Community Water System

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

 

96

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20140.794 ppb163ND - 5.00 ppb
20150.813 ppb165ND - 2.90 ppb
20160.863 ppb165ND - 4.00 ppb
20170.594 ppb163ND - 3.50 ppb
20181.13 ppb167ND - 3.40 ppb
20191.03 ppb166ND - 3.70 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
2014-02-1214044004601ND
2014-02-1214044004501ND
2014-02-1214044004401ND
2014-02-1214044004701ND
2014-05-07141280060015.00 ppb
2014-05-0714128005901ND
2014-05-07141280061014.00 ppb
2014-05-07141280062013.70 ppb
2014-08-0614219008401ND
2014-08-0614219008201ND
2014-08-0614219008501ND
2014-08-0614219008301ND
2014-11-0514310008701ND
2014-11-0514310008601ND
2014-11-0514310008901ND
2014-11-0514310008801ND
2015-02-0315036002601ND
2015-02-0315036002701ND
2015-02-0315036002501ND
2015-02-0315036002801ND
2015-05-0615127009101ND
2015-05-0615127009201ND
2015-05-06151270094012.50 ppb
2015-05-0615127009301ND
2015-08-05152180025012.70 ppb
2015-08-0515218002301ND
2015-08-05152180024012.90 ppb
2015-08-05152180026012.70 ppb
2015-11-02153090052012.20 ppb
2015-11-0315309005001ND
2015-11-0315309005101ND
2015-11-0315309005301ND
2016-02-03160360037012.00 ppb
2016-02-03160360036012.80 ppb
2016-02-0316036003501ND
2016-02-0316036003401ND
2016-05-0316126010201ND
2016-05-0316126010101ND
2016-05-0316126010001ND
2016-05-0316126009901ND
2016-08-02162170027012.40 ppb
2016-08-02162170028014.00 ppb
2016-08-0216217002901ND
2016-08-02162170003012.60 ppb
2016-11-0216308010901ND
2016-11-0216308011001ND
2016-11-0216308010801ND
2016-11-0216308010701ND
2017-01-3117033008901ND
2017-01-3117033008701ND
2017-01-3117033009001ND
2017-01-3117033008801ND
2017-05-0317124004401ND
2017-05-0317124004501ND
2017-05-0317124004601ND
2017-05-0317124004301ND
2017-08-02172150111013.20 ppb
2017-08-02172150112013.50 ppb
2017-08-0217215011301ND
2017-08-02172150110012.80 ppb
2017-11-0717313006601ND
2017-11-0717313006701ND
2017-11-0717313006501ND
2017-11-0717313006801ND
2018-02-0618039005201ND
2018-02-0618039005401ND
2018-02-0618039005501ND
2018-02-0618039005301ND
2018-05-0218123010701ND
2018-05-02181230106012.40 ppb
2018-05-0218123010501ND
2018-05-0218123010401ND
2018-08-07182210103012.40 ppb
2018-08-07182210102013.40 ppb
2018-08-07182210101013.20 ppb
2018-08-0718221010001ND
2018-11-06183110035012.10 ppb
2018-11-0618311003301ND
2018-11-06183110056012.30 ppb
2018-11-06183110034012.20 ppb
2019-02-0519038008601ND
2019-02-0519038008701ND
2019-02-0519038008401ND
2019-02-0519038008501ND
2019-05-07191290099013.40 ppb
2019-05-07191290101012.50 ppb
2019-05-0719129010201ND
2019-05-07191290100013.70 ppb
2019-08-06192200117012.80 ppb
2019-08-0619220011801ND
2019-08-0619220011901ND
2019-08-0619220011601ND
2019-11-0519311013801ND
2019-11-05193110137012.10 ppb
2019-11-0519311014001ND
2019-11-05193110139012.00 ppb