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EWG's Tap Water Database — 2021 UPDATE

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Monochloroacetic acid

Town of Clayton 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

 

88

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20142.33 ppb162ND - 18.6 ppb
2015ND160ND
2016ND80ND
20171.06 ppb164ND - 5.00 ppb
20181.06 ppb164ND - 4.70 ppb
20191.21 ppb168ND - 4.80 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
2014-03-121284881ND
2014-03-12128488018.6 ppb
2014-03-121284881ND
2014-03-12128488018.6 ppb
2014-06-251312426ND
2014-06-251312427ND
2014-06-251312427ND
2014-06-251312426ND
2014-09-241336885ND
2014-09-241336886ND
2014-09-241336886ND
2014-09-241336885ND
2014-12-181358969ND
2014-12-181358970ND
2014-12-181358970ND
2014-12-181358969ND
2015-03-251382229ND
2015-03-251382230ND
2015-03-251382230ND
2015-03-251382229ND
2015-06-231405356ND
2015-06-231405357ND
2015-06-231405357ND
2015-06-231405356ND
2015-09-251430683ND
2015-09-251430684ND
2015-09-251430683ND
2015-09-251430684ND
2015-12-161452170ND
2015-12-161452171ND
2015-12-161452170ND
2015-12-161452171ND
2016-03-231476938ND
2016-03-231476939ND
2016-03-231476938ND
2016-03-231476939ND
2016-06-211501379ND
2016-06-211501378ND
2016-06-211501379ND
2016-06-211501378ND
2017-03-0935300113002ND
2017-03-0935300113001ND
2017-03-0935300113001ND
2017-03-0935300113002ND
2017-06-1935319444001ND
2017-06-1935319444002ND
2017-06-1935319444002ND
2017-06-1935319444001ND
2017-09-13353357030155.00 ppb
2017-09-13353357030143.50 ppb
2017-09-13353357030155.00 ppb
2017-09-13353357030143.50 ppb
2017-12-2035364965001ND
2017-12-2035364965002ND
2017-12-2035364965002ND
2017-12-2035364965001ND
2018-03-14353805260014.70 ppb
2018-03-14353805260023.80 ppb
2018-03-14353805260014.70 ppb
2018-03-14353805260023.80 ppb
2018-06-0635397136001ND
2018-06-0635397136002ND
2018-06-0635397136001ND
2018-06-0635397136002ND
2018-09-1935419440001ND
2018-09-1935419440002ND
2018-09-1935419440001ND
2018-09-1935419440002ND
2018-12-1235437263001ND
2018-12-1235437263002ND
2018-12-1235437263001ND
2018-12-1235437263002ND
2019-03-1835456308002ND
2019-03-18354563080011.80 ppb
2019-03-18354563080011.80 ppb
2019-03-1835456308002ND
2019-06-1935477110002ND
2019-06-1935477110002ND
2019-06-19354771100014.80 ppb
2019-06-19354771100014.80 ppb
2019-09-1635498597002ND
2019-09-1635498597001ND
2019-09-1635498597001ND
2019-09-1635498597002ND
2019-12-10355182440011.90 ppb
2019-12-10355182440021.20 ppb
2019-12-10355182440011.90 ppb
2019-12-10355182440021.20 ppb