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EWG's Tap Water Database — 2021 UPDATE

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Monochloroacetic acid

Howard Waterworks

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
20140.218 ppb164ND - 1.10 ppb
2015ND160ND
20160.0325 ppb161ND - 0.520 ppb
2017ND160ND
2018ND160ND
20190.313 ppb164ND - 1.60 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
2014-03-13774721ND
2014-03-13774718ND
2014-03-13774719ND
2014-03-13774720ND
2014-06-117965010.870 ppb
2014-06-117965001.000 ppb
2014-06-117965021.10 ppb
2014-06-11796503ND
2014-09-08817132ND
2014-09-08817134ND
2014-09-08817131ND
2014-09-09817133ND
2014-12-02834340ND
2014-12-028343390.510 ppb
2014-12-02834338ND
2014-12-02834337ND
2015-03-10847712ND
2015-03-10847713ND
2015-03-10847711ND
2015-03-10847714ND
2015-06-10865033ND
2015-06-10865031ND
2015-06-10865032ND
2015-06-10865034ND
2015-09-10883013ND
2015-09-10883015ND
2015-09-10883012ND
2015-09-10883014ND
2015-12-08897784ND
2015-12-08897785ND
2015-12-08897783ND
2015-12-08897786ND
2016-03-07909032ND
2016-03-07909033ND
2016-03-07909035ND
2016-03-07909034ND
2016-06-079253140.520 ppb
2016-06-07925316ND
2016-06-07925315ND
2016-06-07925313ND
2016-09-07944231ND
2016-09-07944230ND
2016-09-07944229ND
2016-09-07944228ND
2016-12-06965045ND
2016-12-06965047ND
2016-12-06965044ND
2016-12-06965046ND
2017-03-07976761ND
2017-03-07976763ND
2017-03-07976760ND
2017-03-07976762ND
2017-06-06996227ND
2017-06-06996225ND
2017-06-06996226ND
2017-06-06996228ND
2017-09-061016697ND
2017-09-061016699ND
2017-09-061016700ND
2017-09-061016698ND
2017-12-051032663ND
2017-12-051032660ND
2017-12-051032662ND
2017-12-051032661ND
2018-03-071044336ND
2018-03-071044337ND
2018-03-071044334ND
2018-03-071044335ND
2018-06-131061602ND
2018-06-131061603ND
2018-06-131061604ND
2018-06-131061605ND
2018-09-051078646ND
2018-09-051078644ND
2018-09-051078645ND
2018-09-051078643ND
2018-12-031095559ND
2018-12-031095558ND
2018-12-031095560ND
2018-12-031095561ND
2019-03-111109412ND
2019-03-111109414ND
2019-03-111109415ND
2019-03-111109413ND
2019-06-051126037ND
2019-06-051126038ND
2019-06-051126040ND
2019-06-051126039ND
2019-09-091146942ND
2019-09-091146941ND
2019-09-091146943ND
2019-09-091146940ND
2019-12-0311635071.000 ppb
2019-12-0311635081.10 ppb
2019-12-0311635061.30 ppb
2019-12-0311635051.60 ppb