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EWG's Tap Water Database — 2021 UPDATE

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Trichloroacetic acid

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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.

MORE ABOUT THIS CONTAMINANT

 

24

Samples

0

Samples exceeding legal limit (MCL)

2

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND40ND
2015ND40ND
2016ND40ND
2017ND40ND
20182.55 ppb42ND - 5.10 ppb
2019ND40ND

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
2014-07-17206870002ND
2014-07-17206870001ND
2014-07-17206870002ND
2014-07-17206870001ND
2015-07-092022517001ND
2015-07-092022517001ND
2015-07-092022517002ND
2015-07-092022517002ND
2016-07-112039596001ND
2016-07-112039596001ND
2016-07-182039878001ND
2016-07-182039878001ND
2017-07-0635322515034ND
2017-07-0635322515034ND
2017-07-0635322515033ND
2017-07-0635322515033ND
2018-07-18354056620015.10 ppb
2018-07-18354056620015.10 ppb
2018-07-2435406475001ND
2018-07-2435406475001ND
2019-07-1935483679001ND
2019-07-1935483679002ND
2019-07-1935483679001ND
2019-07-1935483679002ND