Menu

EWG's Tap Water Database — 2021 UPDATE

Donate

Monochloroacetic acid

Files Valley Water Supply Corporation

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.

 

24

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND40ND
2015ND40ND
20162.75 ppb42ND - 6.90 ppb
2017ND40ND
20182.88 ppb442.00 ppb - 4.40 ppb
20192.53 ppb441.90 ppb - 3.30 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
2014-02-18AC43242ND
2014-05-22AC55044ND
2014-08-20AC64600ND
2014-12-10AC74344ND
2015-03-16AC84406ND
2015-06-17AC96369ND
2015-07-29AD01506ND
2015-12-03AD15409ND
2016-02-17AD239076.90 ppb
2016-05-03AD350664.10 ppb
2016-09-06AD47895ND
2016-12-06AD60908ND
2017-03-07Q1709506002ND
2017-05-08Q1718726001ND
2017-08-16Q1736366001ND
2017-11-28Q1760207001ND
2018-02-15Q18066990022.00 ppb
2018-05-16Q18200130014.40 ppb
2018-09-12Q18361610022.30 ppb
2018-11-29Q18488670022.80 ppb
2019-02-05Q19053280033.30 ppb
2019-05-07Q19215490012.80 ppb
2019-09-18Q19670490012.10 ppb
2019-12-09Q19795750011.90 ppb