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EWG's Tap Water Database — 2021 UPDATE

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Monochloroacetic acid

Rowena 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

 

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
2016ND40ND
2017ND40ND
20180.700 ppb42ND - 1.70 ppb
2019ND40ND

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
2014-02-27AC45051ND
2014-06-05AC56130ND
2014-09-16AC67494ND
2014-12-09AC74027ND
2015-03-04AC82726ND
2015-06-01AC93955ND
2015-07-20AD00113ND
2015-11-04AD12588ND
2016-02-16AD23621ND
2016-05-24AD37934ND
2016-08-02AD46850ND
2016-11-30AD59813ND
2017-03-01Q1708977001ND
2017-05-17Q1720176001ND
2017-07-27Q1731207001ND
2017-11-02Q1756370001ND
2018-02-22Q1807535001ND
2018-04-25Q18168530011.70 ppb
2018-07-18Q18285400021.10 ppb
2018-11-13Q1845534001ND
2019-03-07Q1909832001ND
2019-05-15Q1925581001ND
2019-08-01Q1950398001ND
2019-12-11Q1979819001ND