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EWG's Tap Water Database — 2021 UPDATE

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Trichloroacetic acid

Harris County MUD 157

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

 

78

Samples

0

Samples exceeding legal limit (MCL)

3

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND20ND
20151.48 ppb123ND - 6.90 ppb
2016ND160ND
2017ND160ND
2018ND160ND
2019ND160ND

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
2014-06-16AC56959ND
2014-06-16AC56958ND
2015-05-15AC92261ND
2015-05-15AC92291ND
2015-05-15AC92260ND
2015-05-15AC92250ND
2015-07-28AD01200ND
2015-07-28AD01229ND
2015-07-28AD01206ND
2015-07-28AD01204ND
2015-12-07AD156856.40 ppb
2015-12-07AD157126.90 ppb
2015-12-07AD157094.50 ppb
2015-12-07AD15711ND
2016-02-11AD23331ND
2016-02-11AD23332ND
2016-02-11AD23328ND
2016-02-11AD23333ND
2016-04-27AD34407ND
2016-04-27AD34409ND
2016-04-27AD34408ND
2016-04-27AD34401ND
2016-09-16AD50005ND
2016-09-16AD49978ND
2016-09-16AD49976ND
2016-09-16AD49981ND
2016-11-18AD58787ND
2016-11-18AD58785ND
2016-11-18AD58784ND
2016-11-18AD58783ND
2017-02-15AD70825ND
2017-02-15AD70827ND
2017-02-15AD70822ND
2017-02-15AD70829ND
2017-05-17AD84630ND
2017-05-17AD84631ND
2017-05-17AD84623ND
2017-05-17AD84624ND
2017-08-16AD93192ND
2017-08-16AD93193ND
2017-08-16AD93194ND
2017-08-16AD93195ND
2017-10-24AE01779ND
2017-10-24AE01777ND
2017-10-24AE01761ND
2017-10-24AE01775ND
2018-02-05AE12174ND
2018-02-05AE12164ND
2018-02-05AE12143ND
2018-02-05AE12138ND
2018-05-03AE25037ND
2018-05-03AE25032ND
2018-05-03AE25033ND
2018-05-03AE25038ND
2018-08-22AE38067ND
2018-08-22AE38065ND
2018-08-22AE38063ND
2018-08-22AE38064ND
2018-11-19AE46444ND
2018-11-19AE46449ND
2018-11-19AE46446ND
2018-11-19AE46467ND
2019-02-20AE55009ND
2019-02-20AE55008ND
2019-02-20AE55004ND
2019-02-20AE55007ND
2019-06-05AE69241ND
2019-06-05AE69239ND
2019-06-05AE69238ND
2019-06-05AE69240ND
2019-08-14AE78587ND
2019-08-14AE78584ND
2019-08-14AE78588ND
2019-08-14AE78585ND
2019-10-02AE85502ND
2019-10-02AE85498ND
2019-10-02AE85501ND
2019-10-02AE85503ND