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EWG's Tap Water Database — 2019 UPDATE

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Monochloroacetic acid

Montreal Waterworks

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.

 

38

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20121.90 ppb106ND - 8.30 ppb
2013ND80ND
2014ND60ND
2015N/A00N/A
20160.217 ppb61ND - 1.30 ppb
20170.213 ppb81ND - 1.70 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
2012-03-14654169ND
2012-03-146541700.890 ppb
2012-03-146541680.970 ppb
2012-03-28656194ND
2012-06-076669250.980 ppb
2012-06-076669232.40 ppb
2012-09-266861795.50 ppb
2012-09-266861788.30 ppb
2012-12-19699243ND
2012-12-19699244ND
2013-02-19705781ND
2013-02-19705782ND
2013-06-13725763ND
2013-06-13725762ND
2013-09-18746328ND
2013-09-18746329ND
2013-12-17763703ND
2013-12-30764708ND
2014-03-18775408ND
2014-03-18775407ND
2014-06-03794030ND
2014-06-03794027ND
2014-08-27813789ND
2014-08-27813788ND
2016-05-03919154ND
2016-05-03919155ND
2016-07-28936124ND
2016-07-28936123ND
2016-10-269558901.30 ppb
2016-10-26955891ND
2017-01-30971550ND
2017-01-309715511.70 ppb
2017-05-04986833ND
2017-05-04986834ND
2017-07-311007672ND
2017-07-311007673ND
2017-10-251026377ND
2017-10-251026378ND