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EWG's Tap Water Database — 2021 UPDATE

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Trichloroacetic acid

Harris County Municipal Utility District 321

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.

 

24

Samples

0

Samples exceeding legal limit (MCL)

14

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20142.50 ppb42ND - 6.90 ppb
20150.350 ppb41ND - 1.40 ppb
20161.28 ppb43ND - 2.30 ppb
20171.30 ppb43ND - 2.20 ppb
20180.675 ppb42ND - 1.50 ppb
20191.13 ppb43ND - 1.80 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
2014-02-24AC442193.10 ppb
2014-04-30AC52497ND
2014-08-14AC63780ND
2014-11-11AC717036.90 ppb
2015-02-12AC80371ND
2015-05-21AC92973ND
2015-09-03AD055741.40 ppb
2015-11-20AD14421ND
2016-02-04AD22086ND
2016-04-28AD346132.30 ppb
2016-09-13AD491001.50 ppb
2016-11-14AD576971.30 ppb
2017-01-12AD646911.60 ppb
2017-04-12AD794432.20 ppb
2017-07-13AD892551.40 ppb
2017-10-17AE01035ND
2018-01-11AE08911ND
2018-04-04AE21172ND
2018-07-12AE330971.20 ppb
2018-10-09AE429261.50 ppb
2019-01-31AE524131.000 ppb
2019-04-18AE62961ND
2019-09-25AE845971.80 ppb
2019-11-07AE888931.70 ppb