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EWG's Tap Water Database — 2019 UPDATE

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Trichloroacetic acid

Montreal Waterworks

Trichloroacetic 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)

27

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201215.7 ppb108ND - 43.0 ppb
20131.61 ppb83ND - 5.30 ppb
20140.733 ppb62ND - 2.30 ppb
2015N/A00N/A
201622.8 ppb661.90 ppb - 50.0 ppb
201720.5 ppb8811.0 ppb - 27.0 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.1 ppb

The EWG Health Guideline of 0.1 ppb for trichloroacetic 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.a one-in-a-million lifetime risk of cancer. Values greater than one-in-a-million cancer risk level can result in increased cancer cases above one in a million people.

ppb = parts per billion

All test results

Date Lab ID Result
2012-03-146541685.30 ppb
2012-03-146541705.40 ppb
2012-03-146541696.50 ppb
2012-03-28656194ND
2012-06-0766692516.0 ppb
2012-06-0766692343.0 ppb
2012-09-2668617924.0 ppb
2012-09-2668617835.0 ppb
2012-12-19699243ND
2012-12-1969924422.0 ppb
2013-02-19705781ND
2013-02-19705782ND
2013-06-13725762ND
2013-06-137257633.90 ppb
2013-09-18746328ND
2013-09-187463293.70 ppb
2013-12-177637035.30 ppb
2013-12-30764708ND
2014-03-187754082.10 ppb
2014-03-18775407ND
2014-06-037940272.30 ppb
2014-06-03794030ND
2014-08-27813789ND
2014-08-27813788ND
2016-05-039191541.90 ppb
2016-05-039191555.00 ppb
2016-07-2893612415.0 ppb
2016-07-2893612320.0 ppb
2016-10-2695589050.0 ppb
2016-10-2695589145.0 ppb
2017-01-3097155127.0 ppb
2017-01-3097155027.0 ppb
2017-05-0498683320.0 ppb
2017-05-0498683425.0 ppb
2017-07-31100767318.0 ppb
2017-07-31100767221.0 ppb
2017-10-25102637811.0 ppb
2017-10-25102637715.0 ppb