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EWG's Tap Water Database — 2021 UPDATE

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Monochloroacetic acid

Better Waterworks 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

 

92

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND160ND
2015ND160ND
2016ND120ND
20172.90 ppb168ND - 12.0 ppb
20180.243 ppb164ND - 1.000 ppb
2019ND160ND

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
2014-02-181279207ND
2014-02-181279206ND
2014-02-181279207ND
2014-02-181279206ND
2014-05-131300705ND
2014-05-131300706ND
2014-05-131300706ND
2014-05-131300705ND
2014-08-121325217ND
2014-08-121325218ND
2014-08-121325218ND
2014-08-121325217ND
2014-11-211352457ND
2014-11-211352458ND
2014-11-211352458ND
2014-11-211352457ND
2015-02-161373190ND
2015-02-161373191ND
2015-02-161373191ND
2015-02-161373190ND
2015-05-051392988ND
2015-05-051392989ND
2015-05-051392989ND
2015-05-051392988ND
2015-08-261422242ND
2015-08-261422242ND
2015-08-261422241ND
2015-08-261422241ND
2015-11-031441232ND
2015-11-031441233ND
2015-11-031441232ND
2015-11-031441233ND
2016-02-171468298ND
2016-02-171468299ND
2016-02-171468298ND
2016-02-171468299ND
2016-08-181518352ND
2016-08-181518352ND
2016-08-181518351ND
2016-08-181518351ND
2016-11-161542213ND
2016-11-161542213ND
2016-11-161542212ND
2016-11-161542212ND
2017-02-01352925820083.10 ppb
2017-02-01352925820073.80 ppb
2017-02-01352925820083.10 ppb
2017-02-01352925820073.80 ppb
2017-05-0535310618012ND
2017-05-0535310618012ND
2017-05-2535314650001ND
2017-05-2535314650001ND
2017-08-0235328002005ND
2017-08-0235328002006ND
2017-08-0235328002006ND
2017-08-0235328002005ND
2017-11-023534616500212.0 ppb
2017-11-02353461650014.30 ppb
2017-11-02353461650014.30 ppb
2017-11-023534616500212.0 ppb
2018-02-0235372111001ND
2018-02-02353721110020.940 ppb
2018-02-0235372111001ND
2018-02-02353721110020.940 ppb
2018-05-0335390246001ND
2018-05-0335390246002ND
2018-05-0335390246001ND
2018-05-0335390246002ND
2018-08-0235408588002ND
2018-08-0235408588001ND
2018-08-0235408588001ND
2018-08-0235408588002ND
2018-11-0935430201001ND
2018-11-09354302010021.000 ppb
2018-11-0935430201001ND
2018-11-09354302010021.000 ppb
2019-02-0135445743002ND
2019-02-0135445743001ND
2019-02-0135445743001ND
2019-02-0135445743002ND
2019-05-0135465858002ND
2019-05-0135465858002ND
2019-05-0135465858001ND
2019-05-0135465858001ND
2019-08-0135487246002ND
2019-08-0135487246001ND
2019-08-0135487246001ND
2019-08-0135487246002ND
2019-11-1435512567001ND
2019-11-1435512567002ND
2019-11-1435512567001ND
2019-11-1435512567002ND