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EWG's Tap Water Database — 2021 UPDATE

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Trichloroacetic acid

Ascension Parish Water Works District 2

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

 

96

Samples

0

Samples exceeding legal limit (MCL)

16

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND160ND
2015ND160ND
20160.988 ppb162ND - 7.90 ppb
2017ND160ND
20182.06 ppb1612ND - 13.5 ppb
20190.0600 ppb162ND - 0.480 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
2014-03-12201236002ND
2014-03-12201236001ND
2014-03-12201236002ND
2014-03-12201236001ND
2014-06-11201578002ND
2014-06-11205178001ND
2014-06-11205178001ND
2014-06-11201578002ND
2014-09-10209332001ND
2014-09-10209332002ND
2014-09-10209332002ND
2014-09-10209332001ND
2014-12-102013520001ND
2014-12-102013520002ND
2014-12-102013520002ND
2014-12-102013520001ND
2015-03-112017250001ND
2015-03-112017250002ND
2015-03-112017250002ND
2015-03-112017250001ND
2015-06-112021200001ND
2015-06-112021200002ND
2015-06-112021200002ND
2015-06-112021200001ND
2015-09-092025520002ND
2015-09-092025520001ND
2015-09-092025520002ND
2015-09-092025520001ND
2015-12-092029833001ND
2015-12-092029833002ND
2015-12-092029833002ND
2015-12-092029833001ND
2016-03-152034069001ND
2016-03-152034069002ND
2016-03-152034069002ND
2016-03-152034069001ND
2016-06-102038200001ND
2016-06-102038200001ND
2016-06-302038987001ND
2016-06-302038987001ND
2016-09-142042722001ND
2016-09-1420427220027.90 ppb
2016-09-142042722001ND
2016-09-1420427220027.90 ppb
2016-12-142047504001ND
2016-12-142047504002ND
2016-12-142047504002ND
2016-12-142047504001ND
2017-03-0935300151007ND
2017-03-0935300151006ND
2017-03-0935300151006ND
2017-03-0935300151007ND
2017-06-1535318870001ND
2017-06-1535318870001ND
2017-06-1535318870002ND
2017-06-1535318870002ND
2017-09-2135337458015ND
2017-09-2135337458016ND
2017-09-2135337458015ND
2017-09-2135337458016ND
2017-12-1535363768002ND
2017-12-1535363768001ND
2017-12-1535363768001ND
2017-12-1535363768002ND
2018-03-02353776800020.860 ppb
2018-03-0235377680001ND
2018-03-02353776800020.860 ppb
2018-03-0235377680001ND
2018-06-22354001050020.310 ppb
2018-06-22354001050020.310 ppb
2018-06-22354001050010.370 ppb
2018-06-22354001050010.370 ppb
2018-09-14354181170020.740 ppb
2018-09-14354181170010.730 ppb
2018-09-14354181170010.730 ppb
2018-09-14354181170020.740 ppb
2018-12-063543585900113.5 ppb
2018-12-0635435859002ND
2018-12-063543585900113.5 ppb
2018-12-0635435859002ND
2019-03-1335455030002ND
2019-03-13354550300010.480 ppb
2019-03-13354550300010.480 ppb
2019-03-1335455030002ND
2019-06-0535473883002ND
2019-06-0535473883002ND
2019-06-0535473883001ND
2019-06-0535473883001ND
2019-09-0435495472002ND
2019-09-0435495472001ND
2019-09-0435495472001ND
2019-09-0435495472002ND
2019-12-1835520096001ND
2019-12-1835520096002ND
2019-12-1835520096001ND
2019-12-1835520096002ND