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EWG's Tap Water Database — 2021 UPDATE

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Monochloroacetic acid

Clayton Water Supply Corporation Plant 3 and 7

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

 

24

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20141.63 ppb41ND - 6.50 ppb
20152.70 ppb42ND - 5.60 ppb
2016ND40ND
2017ND40ND
20183.33 ppb42ND - 8.70 ppb
20192.95 ppb42ND - 5.90 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
2014-03-05Q1407337001ND
2014-06-27Q1424562001ND
2014-09-27Q1448984001ND
2014-11-20Q14570210016.50 ppb
2015-03-19Q15103950015.20 ppb
2015-06-23Q15235200065.60 ppb
2015-09-04Q1534612001ND
2015-12-04Q1548520001ND
2016-03-30Q1612855005ND
2016-06-14Q1623765001ND
2016-09-15Q1637962001ND
2016-11-22Q1651057001ND
2017-02-23Q1707881004ND
2017-05-17Q1720068001ND
2017-09-14Q1743705001ND
2017-11-16Q1759023001ND
2018-02-22Q1807615001ND
2018-05-24Q18209430014.60 ppb
2018-08-23Q1833946008ND
2018-12-14Q18517840018.70 ppb
2019-02-05Q19052140055.90 ppb
2019-04-30Q19172520015.90 ppb
2019-08-26Q1959271001ND
2019-12-17Q1980333001ND