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EWG's Tap Water Database — 2019 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.

 

70

Samples

0

Samples exceeding legal limit (MCL)

58

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.850 ppb110.850 ppb
20130.980 ppb550.820 ppb - 1.30 ppb
20140.483 ppb1611ND - 1.60 ppb
20151.00 ppb1615ND - 1.70 ppb
20160.965 ppb16160.630 ppb - 1.30 ppb
20170.401 ppb1610ND - 0.720 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
2012-08-06583511DF0.850 ppb
2013-08-12601276DF0.820 ppb
2013-10-15604638DF1.30 ppb
2013-10-15604637DF1.000 ppb
2013-10-15604636DF0.870 ppb
2013-10-15604635DF0.910 ppb
2014-01-06313530.540 ppb
2014-01-06313560.580 ppb
2014-01-0631360ND
2014-01-06313630.520 ppb
2014-04-21100844ND
2014-04-211008800.620 ppb
2014-04-211008990.530 ppb
2014-04-211008450.540 ppb
2014-07-07146864ND
2014-07-07146865ND
2014-07-07146902ND
2014-07-071469030.620 ppb
2014-10-132131670.670 ppb
2014-10-132131750.790 ppb
2014-10-132131800.720 ppb
2014-10-132131651.60 ppb
2015-01-052582041.50 ppb
2015-01-052582051.70 ppb
2015-01-052582021.60 ppb
2015-01-052582031.50 ppb
2015-06-013408210.980 ppb
2015-06-013408201.10 ppb
2015-06-013408191.20 ppb
2015-06-013408221.10 ppb
2015-07-133666830.750 ppb
2015-07-133666820.860 ppb
2015-07-133666851.10 ppb
2015-07-133666840.970 ppb
2015-10-124217290.570 ppb
2015-10-124217280.500 ppb
2015-10-12421730ND
2015-10-124217310.640 ppb
2016-01-114752280.970 ppb
2016-01-114752290.950 ppb
2016-01-114752300.960 ppb
2016-01-114752310.880 ppb
2016-04-045203160.660 ppb
2016-04-045203140.630 ppb
2016-04-045203150.640 ppb
2016-04-045203170.750 ppb
2016-07-125820161.10 ppb
2016-07-125820171.10 ppb
2016-07-125820180.830 ppb
2016-07-125820150.770 ppb
2016-10-036352121.30 ppb
2016-10-036352131.30 ppb
2016-10-036352151.30 ppb
2016-10-036352141.30 ppb
2017-01-09680013ND
2017-01-09680012ND
2017-01-09680011ND
2017-01-09680010ND
2017-04-117410250.680 ppb
2017-04-117410260.670 ppb
2017-04-117410240.670 ppb
2017-04-117410230.710 ppb
2017-07-177996430.670 ppb
2017-07-17799641ND
2017-07-177996400.720 ppb
2017-07-177996420.510 ppb
2017-10-02851963ND
2017-10-028519610.720 ppb
2017-10-028519620.500 ppb
2017-10-028519640.570 ppb