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EWG's Tap Water Database — 2021 UPDATE

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Trichloroacetic acid

West Allis Waterworks

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)

86

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20140.934 ppb1614ND - 1.60 ppb
20150.813 ppb1615ND - 1.10 ppb
20160.471 ppb1613ND - 0.800 ppb
20170.826 ppb16160.570 ppb - 1.10 ppb
20180.953 ppb16160.690 ppb - 1.30 ppb
20190.399 ppb1612ND - 1.000 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
2014-02-13770576ND
2014-02-137705780.690 ppb
2014-02-137705790.820 ppb
2014-02-13770577ND
2014-05-127850611.20 ppb
2014-05-127850591.20 ppb
2014-05-127850581.20 ppb
2014-05-127850601.20 ppb
2014-08-118094641.60 ppb
2014-08-118094621.60 ppb
2014-08-118094611.40 ppb
2014-08-118094631.30 ppb
2014-11-038294170.630 ppb
2014-11-038294160.500 ppb
2014-11-038294140.610 ppb
2014-11-038294151.000 ppb
2015-02-098424310.910 ppb
2015-02-098424331.10 ppb
2015-02-098424321.000 ppb
2015-02-098424340.830 ppb
2015-05-068585520.900 ppb
2015-05-068585500.820 ppb
2015-05-068585511.10 ppb
2015-05-068585490.790 ppb
2015-08-11876543ND
2015-08-118765421.10 ppb
2015-08-118765401.000 ppb
2015-08-118765411.000 ppb
2015-11-028922740.300 ppb
2015-11-028922760.800 ppb
2015-11-028922750.460 ppb
2015-11-028922770.900 ppb
2016-02-099048140.310 ppb
2016-02-099048120.580 ppb
2016-02-099048130.700 ppb
2016-02-099048110.720 ppb
2016-05-05919802ND
2016-05-05919804ND
2016-05-05919803ND
2016-05-059198050.230 ppb
2016-08-029368910.490 ppb
2016-08-029368920.560 ppb
2016-08-029368930.540 ppb
2016-08-029368940.520 ppb
2016-10-319565310.600 ppb
2016-10-319565300.720 ppb
2016-10-319565330.770 ppb
2016-10-319565320.800 ppb
2017-02-079727230.710 ppb
2017-02-079727210.970 ppb
2017-02-079727200.890 ppb
2017-02-079727220.740 ppb
2017-05-089872370.780 ppb
2017-05-089872360.800 ppb
2017-05-089872350.770 ppb
2017-05-089872380.770 ppb
2017-08-0910103331.10 ppb
2017-08-0910103321.10 ppb
2017-08-0910103301.000 ppb
2017-08-0910103310.980 ppb
2017-11-0810288910.780 ppb
2017-11-0810288900.690 ppb
2017-11-0810288920.570 ppb
2017-11-0810288930.570 ppb
2018-02-0710401570.690 ppb
2018-02-0710401550.760 ppb
2018-02-0710401540.890 ppb
2018-02-0710401560.920 ppb
2018-05-0710542641.20 ppb
2018-05-0710542621.20 ppb
2018-05-0710542651.20 ppb
2018-05-0710542631.30 ppb
2018-08-0610717550.760 ppb
2018-08-0610717580.920 ppb
2018-08-0610717560.880 ppb
2018-08-0610717570.780 ppb
2018-11-0610913350.760 ppb
2018-11-0610913340.980 ppb
2018-11-0610913321.000 ppb
2018-11-0610913331.000 ppb
2019-02-041103567ND
2019-02-041103566ND
2019-02-041103565ND
2019-02-041103568ND
2019-05-0611192620.310 ppb
2019-05-0611192610.440 ppb
2019-05-0611192590.400 ppb
2019-05-0611192600.290 ppb
2019-08-0511384340.800 ppb
2019-08-0511384330.890 ppb
2019-08-0511384321.000 ppb
2019-08-0511384311.000 ppb
2019-11-0411589950.270 ppb
2019-11-0411589940.310 ppb
2019-11-0411589930.330 ppb
2019-11-0411589960.340 ppb