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EWG's Tap Water Database — 2021 UPDATE

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Monochloroacetic acid

University of Kansas

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
20142.34 ppb1611ND - 5.60 ppb
20153.58 ppb1615ND - 7.30 ppb
20161.67 ppb1611ND - 3.00 ppb
20171.76 ppb169ND - 3.70 ppb
20181.20 ppb168ND - 3.10 ppb
20191.50 ppb169ND - 3.90 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
2014-02-1160020ND
2014-02-1160001ND
2014-02-1159987ND
2014-02-1159984ND
2014-05-121134842.40 ppb
2014-05-121134832.80 ppb
2014-05-121134822.00 ppb
2014-05-121134812.00 ppb
2014-08-191761503.10 ppb
2014-08-191761493.90 ppb
2014-08-191761512.50 ppb
2014-08-191803192.50 ppb
2014-11-242360375.60 ppb
2014-11-242360365.00 ppb
2014-11-242360355.60 ppb
2014-11-24236034ND
2015-02-022701732.80 ppb
2015-02-022701725.20 ppb
2015-02-022701715.00 ppb
2015-02-022701634.10 ppb
2015-05-133324492.10 ppb
2015-05-133324532.40 ppb
2015-05-133324552.60 ppb
2015-05-133324544.20 ppb
2015-08-103815997.30 ppb
2015-08-10381598ND
2015-08-103815975.40 ppb
2015-08-103815965.70 ppb
2015-11-034281843.30 ppb
2015-11-034281832.30 ppb
2015-11-034281822.30 ppb
2015-11-034281812.60 ppb
2016-02-084903472.70 ppb
2016-02-084903462.10 ppb
2016-02-08490348ND
2016-02-084903492.00 ppb
2016-05-235507222.50 ppb
2016-05-235507212.30 ppb
2016-05-235507202.30 ppb
2016-05-235507193.00 ppb
2016-08-22607164ND
2016-08-22607163ND
2016-08-226071622.50 ppb
2016-08-22607161ND
2016-11-02651302ND
2016-11-026513052.20 ppb
2016-11-026513042.80 ppb
2016-11-026513032.30 ppb
2017-02-07704776ND
2017-02-077047753.10 ppb
2017-02-07704774ND
2017-02-07704773ND
2017-05-237656632.80 ppb
2017-05-237656622.90 ppb
2017-05-237656613.00 ppb
2017-05-237656602.80 ppb
2017-08-218231423.50 ppb
2017-08-218231403.60 ppb
2017-08-218231443.70 ppb
2017-08-218231472.80 ppb
2017-11-08873219ND
2017-11-08873218ND
2017-11-08873217ND
2017-11-08873216ND
2018-02-079085882.30 ppb
2018-02-079085872.50 ppb
2018-02-079085862.20 ppb
2018-02-079085852.40 ppb
2018-05-219733512.00 ppb
2018-05-21973353ND
2018-05-21973355ND
2018-05-21973354ND
2018-08-2010283013.10 ppb
2018-08-201028300ND
2018-08-201028299ND
2018-08-201028298ND
2018-11-051070484ND
2018-11-051070483ND
2018-11-0510704822.60 ppb
2018-11-0510704812.10 ppb
2019-02-131120789ND
2019-02-1311207872.00 ppb
2019-02-1311207902.00 ppb
2019-02-131120791ND
2019-05-0811580232.40 ppb
2019-05-0811580222.80 ppb
2019-05-0811580213.90 ppb
2019-05-0811580203.30 ppb
2019-08-071219860ND
2019-08-0712198592.10 ppb
2019-08-0712198582.40 ppb
2019-08-071219857ND
2019-11-041268257ND
2019-11-041268260ND
2019-11-041268259ND
2019-11-0412682583.10 ppb