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EWG's Tap Water Database — 2021 UPDATE

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Monochloroacetic acid

University Park

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
20142.41 ppb1612ND - 4.30 ppb
20150.744 ppb165ND - 2.60 ppb
20162.22 ppb1610ND - 5.70 ppb
20170.744 ppb164ND - 3.10 ppb
20182.37 ppb1612ND - 3.80 ppb
20191.39 ppb1610ND - 3.60 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
2014-02-28Q14067960043.20 ppb
2014-02-28Q14067960032.90 ppb
2014-02-28Q14067960023.20 ppb
2014-02-28Q14067960013.10 ppb
2014-04-15Q14121680042.80 ppb
2014-04-15Q14121680032.70 ppb
2014-04-15Q14121680022.80 ppb
2014-04-15Q14121680012.70 ppb
2014-07-03Q1425909002ND
2014-07-03Q1425909001ND
2014-07-03Q1425909003ND
2014-07-03Q1425909004ND
2014-11-05Q14548570053.30 ppb
2014-11-05Q14548570044.20 ppb
2014-11-05Q14548570034.30 ppb
2014-11-05Q14548570023.40 ppb
2015-01-26Q15026720052.40 ppb
2015-01-26Q15026720042.50 ppb
2015-01-26Q15026720032.60 ppb
2015-01-26Q15026720022.40 ppb
2015-06-09Q15210450012.00 ppb
2015-06-09Q1521045002ND
2015-06-09Q1521045004ND
2015-06-09Q1521045003ND
2015-09-04Q1534743004ND
2015-09-04Q1534743001ND
2015-09-04Q1534743003ND
2015-09-04Q1534743002ND
2015-12-08Q1548792004ND
2015-12-08Q1548792003ND
2015-12-08Q1548792002ND
2015-12-08Q1548792001ND
2016-02-03Q16049480022.00 ppb
2016-02-03Q16049480012.20 ppb
2016-02-03Q1604948003ND
2016-02-03Q16049480042.10 ppb
2016-04-27Q16166400044.00 ppb
2016-04-27Q16166400033.20 ppb
2016-04-27Q16166400024.10 ppb
2016-04-27Q16166400014.80 ppb
2016-08-02Q16321000045.30 ppb
2016-08-02Q1632100003ND
2016-08-02Q16321000025.70 ppb
2016-08-02Q16321000012.10 ppb
2016-11-02Q1647017002ND
2016-11-02Q1647017003ND
2016-11-02Q1647017001ND
2016-11-02Q1647017004ND
2017-01-24Q1703296002ND
2017-01-24Q1703296004ND
2017-01-24Q1703296001ND
2017-01-24Q1703296003ND
2017-04-12Q1715263004ND
2017-04-12Q1715263003ND
2017-04-12Q1715263002ND
2017-04-12Q1715263001ND
2017-07-26Q1730808003ND
2017-07-26Q1730808001ND
2017-07-26Q1730808002ND
2017-07-26Q1730808004ND
2017-11-10Q17579640022.80 ppb
2017-11-10Q17579640042.90 ppb
2017-11-10Q17579640013.10 ppb
2017-11-10Q17579640033.10 ppb
2018-02-07Q1805097005ND
2018-02-07Q1805097004ND
2018-02-07Q1805097003ND
2018-02-07Q1805097002ND
2018-05-02Q18178050043.10 ppb
2018-05-02Q18178050013.50 ppb
2018-05-02Q18178050023.00 ppb
2018-05-02Q18178050033.00 ppb
2018-08-13Q18322380043.60 ppb
2018-08-13Q18322380012.70 ppb
2018-08-13Q18322380033.40 ppb
2018-08-13Q18322380023.80 ppb
2018-11-08Q18448820043.00 ppb
2018-11-08Q18448820023.00 ppb
2018-11-08Q18448820032.90 ppb
2018-11-08Q18448820012.90 ppb
2019-01-24Q19037470023.00 ppb
2019-01-24Q19037470043.10 ppb
2019-01-24Q19037470053.60 ppb
2019-01-24Q19037470033.00 ppb
2019-04-17Q19157860032.40 ppb
2019-04-17Q19157860021.000 ppb
2019-04-17Q1915786004ND
2019-04-17Q1915786001ND
2019-09-05Q1962655004ND
2019-09-05Q1962655003ND
2019-09-05Q1962655002ND
2019-09-05Q1962655001ND
2019-11-07Q19761330011.60 ppb
2019-11-07Q19761330041.50 ppb
2019-11-07Q19761330031.50 ppb
2019-11-07Q19761330021.60 ppb