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EWG's Tap Water Database — 2021 UPDATE

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Monochloroacetic acid

Blocker Crossroads 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.

MORE ABOUT THIS CONTAMINANT

 

20

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND20ND
2015ND20ND
201616.9 ppb2210.2 ppb - 23.5 ppb
2017ND20ND
20180.250 ppb41ND - 1.000 ppb
20191.21 ppb82ND - 7.00 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
2014-07-31Q1432893004ND
2014-07-31Q1432893003ND
2015-07-23Q1528836019ND
2015-07-23Q1528836018ND
2016-09-15Q163802500223.5 ppb
2016-09-15Q163802500110.2 ppb
2017-05-25Q1722390011ND
2017-05-25Q1722390010ND
2018-08-02Q18308040011.000 ppb
2018-08-02Q1830804002ND
2018-11-20Q1847590020ND
2018-11-20Q1847590001ND
2019-03-13Q1910600002ND
2019-03-13Q1910600001ND
2019-05-22Q19277330102.70 ppb
2019-05-22Q19277330097.00 ppb
2019-09-11Q1964097002ND
2019-09-11Q1964097001ND
2019-12-03Q1979084001ND
2019-12-03Q1979084002ND