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EWG's Tap Water Database — 2021 UPDATE

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Monochloroacetic acid

Magazine

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

 

54

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20141.04 ppb145ND - 3.50 ppb
20150.275 ppb81ND - 2.20 ppb
2016ND80ND
20170.275 ppb81ND - 2.20 ppb
20180.300 ppb81ND - 2.40 ppb
20190.675 ppb82ND - 3.00 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
2014-01-1514017002201ND
2014-01-1514017002101ND
2014-01-1514017002301ND
2014-02-26140580101013.20 ppb
2014-02-26140580100013.20 ppb
2014-02-26140580099013.50 ppb
2014-04-1014101004201ND
2014-04-10141010041012.60 ppb
2014-04-10141010043012.10 ppb
2014-07-0814190002101ND
2014-07-0814190002201ND
2014-07-0814190002301ND
2014-10-1414289005901ND
2014-10-1414289006001ND
2015-01-1515016002001ND
2015-01-1515016002601ND
2015-04-1415106007901ND
2015-04-14151060080012.20 ppb
2015-07-1415197010201ND
2015-07-1415197010101ND
2015-10-1315289001601ND
2015-10-1315289001701ND
2016-01-1316015002601ND
2016-01-1316015002501ND
2016-04-1316106000901ND
2016-04-1316106000801ND
2016-07-1116196009701ND
2016-07-1116196009801ND
2016-10-1216288002501ND
2016-10-1216288002601ND
2017-01-1117013002001ND
2017-01-1117013002101ND
2017-04-1217103006001ND
2017-04-12171030059012.20 ppb
2017-07-1017194012401ND
2017-07-1017194012301ND
2017-10-1617292001201ND
2017-10-1617292001101ND
2018-01-1018011008102ND
2018-01-1018011008002ND
2018-04-1018101001101ND
2018-04-1018101001001ND
2018-07-1018192004101ND
2018-07-10181920046012.40 ppb
2018-10-0818283003301ND
2018-12-0518340008001ND
2019-01-1419017011001ND
2019-01-1419017011101ND
2019-04-0919101011901ND
2019-04-0919101012001ND
2019-07-3019213004702ND
2019-07-3019213004802ND
2019-10-08192830119013.00 ppb
2019-10-08192830118012.40 ppb