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EWG's Tap Water Database — 2021 UPDATE

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Trichloroacetic acid

City of Hays

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

 

94

Samples

0

Samples exceeding legal limit (MCL)

71

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.483 ppb1611ND - 1.60 ppb
20151.00 ppb1615ND - 1.70 ppb
20160.965 ppb16160.630 ppb - 1.30 ppb
20170.423 ppb149ND - 0.720 ppb
20180.607 ppb1612ND - 1.30 ppb
20190.372 ppb168ND - 0.990 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
2014-01-06313630.520 ppb
2014-01-0631360ND
2014-01-06313560.580 ppb
2014-01-06313530.540 ppb
2014-04-211008990.530 ppb
2014-04-211008800.620 ppb
2014-04-211008450.540 ppb
2014-04-21100844ND
2014-07-07146865ND
2014-07-07146864ND
2014-07-07146902ND
2014-07-071469030.620 ppb
2014-10-132131800.720 ppb
2014-10-132131750.790 ppb
2014-10-132131670.670 ppb
2014-10-132131651.60 ppb
2015-01-052582051.70 ppb
2015-01-052582041.50 ppb
2015-01-052582031.50 ppb
2015-01-052582021.60 ppb
2015-06-013408201.10 ppb
2015-06-013408191.20 ppb
2015-06-013408210.980 ppb
2015-06-013408221.10 ppb
2015-07-133666851.10 ppb
2015-07-133666840.970 ppb
2015-07-133666830.750 ppb
2015-07-133666820.860 ppb
2015-10-124217310.640 ppb
2015-10-12421730ND
2015-10-124217290.570 ppb
2015-10-124217280.500 ppb
2016-01-114752310.880 ppb
2016-01-114752280.970 ppb
2016-01-114752290.950 ppb
2016-01-114752300.960 ppb
2016-04-045203170.750 ppb
2016-04-045203160.660 ppb
2016-04-045203150.640 ppb
2016-04-045203140.630 ppb
2016-07-125820180.830 ppb
2016-07-125820171.10 ppb
2016-07-125820161.10 ppb
2016-07-125820150.770 ppb
2016-10-036352141.30 ppb
2016-10-036352151.30 ppb
2016-10-036352131.30 ppb
2016-10-036352121.30 ppb
2017-01-09680013ND
2017-01-09680012ND
2017-01-09680011ND
2017-01-09680010ND
2017-04-117410260.670 ppb
2017-04-117410250.680 ppb
2017-04-117410240.670 ppb
2017-04-117410230.710 ppb
2017-07-177996430.670 ppb
2017-07-177996400.720 ppb
2017-07-17799641ND
2017-07-177996420.510 ppb
2017-10-028519640.570 ppb
2017-10-028519610.720 ppb
2018-01-169080370.630 ppb
2018-01-169080360.680 ppb
2018-01-169080350.720 ppb
2018-01-169080341.30 ppb
2018-04-169382700.760 ppb
2018-04-169382710.630 ppb
2018-04-169382730.570 ppb
2018-04-169382720.520 ppb
2018-08-2010294860.890 ppb
2018-08-2010294851.30 ppb
2018-08-2010294841.000 ppb
2018-08-2010294830.710 ppb
2018-10-151061603ND
2018-10-151061602ND
2018-10-151061601ND
2018-10-151061600ND
2019-02-251126397ND
2019-02-251126396ND
2019-02-2511263980.500 ppb
2019-02-251126399ND
2019-04-151139214ND
2019-04-151139213ND
2019-04-151139212ND
2019-04-151139211ND
2019-08-0512163040.570 ppb
2019-08-051216303ND
2019-08-0512163020.830 ppb
2019-08-0512163010.540 ppb
2019-10-1412598210.990 ppb
2019-10-1412598240.690 ppb
2019-10-1412598230.840 ppb
2019-10-1412598220.990 ppb