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EWG's Tap Water Database — 2021 UPDATE

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Trichloroacetic acid

City of Weslaco

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)

78

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20142.22 ppb16161.000 ppb - 3.80 ppb
20151.64 ppb1614ND - 2.30 ppb
20161.28 ppb1610ND - 3.40 ppb
20173.11 ppb16161.10 ppb - 5.70 ppb
20182.17 ppb16161.30 ppb - 3.90 ppb
20190.513 ppb166ND - 1.70 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
2014-03-19AC477202.00 ppb
2014-03-19AC477081.70 ppb
2014-03-19AC477062.10 ppb
2014-03-19AC477091.90 ppb
2014-04-22AC513742.40 ppb
2014-04-22AC513722.40 ppb
2014-04-22AC513731.000 ppb
2014-04-22AC513752.00 ppb
2014-07-23AC607561.20 ppb
2014-07-23AC607522.00 ppb
2014-07-23AC607512.70 ppb
2014-07-23AC607532.40 ppb
2014-10-21AC701743.20 ppb
2014-10-21AC701552.50 ppb
2014-10-21AC701512.20 ppb
2014-10-21AC701523.80 ppb
2015-01-23AC777421.40 ppb
2015-01-23AC777301.40 ppb
2015-01-23AC777691.90 ppb
2015-01-23AC777682.10 ppb
2015-04-07AC874671.90 ppb
2015-04-07AC874521.90 ppb
2015-04-07AC874552.00 ppb
2015-04-07AC874802.20 ppb
2015-07-14AC993402.20 ppb
2015-07-14AC993252.30 ppb
2015-07-14AC993392.10 ppb
2015-07-14AC993372.20 ppb
2015-11-18AD140071.10 ppb
2015-11-18AD14018ND
2015-11-18AD140001.60 ppb
2015-11-18AD14002ND
2016-03-02AD266261.10 ppb
2016-03-02AD26615ND
2016-03-02AD26621ND
2016-03-02AD26617ND
2016-06-07AD39569ND
2016-06-07AD39571ND
2016-06-07AD395732.10 ppb
2016-06-07AD39577ND
2016-07-14AD442291.40 ppb
2016-07-14AD442261.40 ppb
2016-07-14AD442272.80 ppb
2016-07-14AD442331.60 ppb
2016-11-15AD579813.40 ppb
2016-11-15AD579852.30 ppb
2016-11-15AD580073.00 ppb
2016-11-15AD579801.30 ppb
2017-02-09AD698934.90 ppb
2017-02-09AD699314.80 ppb
2017-02-09AD698944.80 ppb
2017-02-09AD698985.70 ppb
2017-05-01AD817754.20 ppb
2017-05-01AD817784.40 ppb
2017-05-01AD817804.10 ppb
2017-05-01AD817483.50 ppb
2017-08-03AD920291.40 ppb
2017-08-03AD920162.30 ppb
2017-08-03AD920171.50 ppb
2017-08-03AD920182.00 ppb
2017-11-02AE034181.30 ppb
2017-11-02AE034152.20 ppb
2017-11-02AE034191.10 ppb
2017-11-02AE034161.60 ppb
2018-02-15AE140283.30 ppb
2018-02-15AE140402.30 ppb
2018-02-15AE140481.40 ppb
2018-02-15AE140313.20 ppb
2018-04-13AE224863.20 ppb
2018-04-13AE224853.90 ppb
2018-04-13AE224882.80 ppb
2018-04-13AE224872.60 ppb
2018-08-15AE371751.60 ppb
2018-08-15AE371691.60 ppb
2018-08-15AE371611.30 ppb
2018-08-15AE371631.40 ppb
2018-10-10AE430621.70 ppb
2018-10-10AE430581.40 ppb
2018-10-10AE430601.40 ppb
2018-10-10AE430531.60 ppb
2019-02-27AE562321.40 ppb
2019-02-27AE562351.50 ppb
2019-02-27AE562341.60 ppb
2019-02-27AE562301.70 ppb
2019-05-21AE67332ND
2019-05-21AE673461.000 ppb
2019-05-21AE67338ND
2019-05-21AE67342ND
2019-08-22AE80160ND
2019-08-22AE80161ND
2019-08-22AE80159ND
2019-08-22AE801641.000 ppb
2019-12-03AE90990ND
2019-12-03AE90989ND
2019-12-03AE90988ND
2019-12-03AE90999ND