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EWG's Tap Water Database — 2021 UPDATE

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Trichloroacetic acid

St. Peters

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

 

116

Samples

0

Samples exceeding legal limit (MCL)

76

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20141.38 ppb3220ND - 4.10 ppb
20151.95 ppb1914ND - 3.92 ppb
20161.97 ppb1713ND - 3.52 ppb
20170.554 ppb166ND - 2.14 ppb
20181.02 ppb169ND - 2.57 ppb
20191.79 ppb1614ND - 2.86 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
2014-03-10AC182343.59 ppb
2014-03-10AC182352.06 ppb
2014-03-10AC182363.60 ppb
2014-03-10AC182372.87 ppb
2014-03-10AC18238ND
2014-03-10AC18239ND
2014-03-10AC18240ND
2014-03-10AC182412.30 ppb
2014-05-28AC232452.66 ppb
2014-05-28AC23246ND
2014-05-28AC232422.53 ppb
2014-05-28AC23243ND
2014-05-28AC232440.910 ppb
2014-05-28AC23247ND
2014-05-28AC23248ND
2014-05-28AC232492.26 ppb
2014-09-22AC334711.76 ppb
2014-09-22AC334644.10 ppb
2014-09-22AC334651.91 ppb
2014-09-22AC334663.75 ppb
2014-09-22AC334671.30 ppb
2014-09-22AC33468ND
2014-09-22AC33469ND
2014-09-22AC33470ND
2014-12-02AC382901.73 ppb
2014-12-02AC38291ND
2014-12-02AC382921.86 ppb
2014-12-02AC38293ND
2014-12-02AC382941.48 ppb
2014-12-02AC382951.48 ppb
2014-12-02AC382961.34 ppb
2014-12-02AC382970.700 ppb
2015-03-09AC42022ND
2015-03-09AC42023ND
2015-03-09AC42021ND
2015-03-09AC42020ND
2015-03-09AC420193.15 ppb
2015-03-09AC420182.26 ppb
2015-03-09AC420173.31 ppb
2015-03-09AC420241.63 ppb
2015-06-03AC465802.38 ppb
2015-06-03AC465813.58 ppb
2015-06-03AC465793.92 ppb
2015-06-03AC465823.28 ppb
2015-09-21AC575633.26 ppb
2015-09-21AC575613.21 ppb
2015-09-21AC575622.79 ppb
2015-09-21AC575641.02 ppb
2015-12-29AC62848ND
2015-12-29AC628472.05 ppb
2015-12-29AC628451.12 ppb
2016-01-05AC62846ND
2016-03-23AC663933.33 ppb
2016-03-23AC66394ND
2016-03-23AC66392ND
2016-03-23AC663913.10 ppb
2016-06-22AC720883.52 ppb
2016-06-22AC720853.15 ppb
2016-06-22AC720862.92 ppb
2016-06-22AC720873.29 ppb
2016-09-21AC817332.50 ppb
2016-09-21AC817312.77 ppb
2016-09-21AC817322.84 ppb
2016-09-21AC817302.69 ppb
2016-11-15AC869871.20 ppb
2016-11-15AC869861.03 ppb
2016-11-15AC86985ND
2016-11-15AC869841.15 ppb
2017-03-15AC90834ND
2017-03-15AC90836ND
2017-03-15AC90837ND
2017-03-15AC90835ND
2017-06-05AC958141.20 ppb
2017-06-05AC958131.22 ppb
2017-06-05AC958111.06 ppb
2017-06-05AC958121.34 ppb
2017-09-06AD035651.91 ppb
2017-09-06AD03566ND
2017-09-06AD03564ND
2017-09-06AD035672.14 ppb
2017-11-28AD09527ND
2017-11-28AD09525ND
2017-11-28AD09526ND
2017-11-28AD09524ND
2018-03-26AD143102.57 ppb
2018-03-26AD14311ND
2018-03-26AD143122.30 ppb
2018-03-26AD143131.46 ppb
2018-06-05AD205412.15 ppb
2018-06-05AD205422.17 ppb
2018-06-05AD205431.93 ppb
2018-06-05AD20544ND
2018-09-06AD313551.25 ppb
2018-09-06AD31353ND
2018-09-06AD31354ND
2018-09-06AD313561.23 ppb
2018-11-27AD35754ND
2018-11-27AD357511.29 ppb
2018-11-27AD35752ND
2018-11-29AD35753ND
2019-02-26AD394192.77 ppb
2019-02-26AD394201.19 ppb
2019-02-26AD394212.72 ppb
2019-02-26AD394222.25 ppb
2019-05-22AD474972.23 ppb
2019-05-22AD474982.68 ppb
2019-05-22AD474992.86 ppb
2019-05-22AD475002.40 ppb
2019-08-28AD540881.77 ppb
2019-08-28AD540891.12 ppb
2019-08-28AD540901.45 ppb
2019-08-28AD540911.93 ppb
2019-12-03AD581331.70 ppb
2019-12-03AD58134ND
2019-12-03AD581351.63 ppb
2019-12-03AD58136ND