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EWG's Tap Water Database — 2021 UPDATE

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Trichloroacetic acid

St. Charles

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)

66

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20142.01 ppb16160.810 ppb - 3.18 ppb
20152.12 ppb1614ND - 4.30 ppb
20161.04 ppb168ND - 3.11 ppb
20171.30 ppb1610ND - 2.60 ppb
20180.675 ppb167ND - 1.82 ppb
20191.40 ppb1611ND - 2.62 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
2014-02-24AC182311.17 ppb
2014-02-24AC182301.65 ppb
2014-02-24AC182333.06 ppb
2014-02-24AC182323.18 ppb
2014-05-28AC232410.810 ppb
2014-05-28AC232401.60 ppb
2014-05-28AC232392.78 ppb
2014-05-28AC232382.87 ppb
2014-09-15AC334632.88 ppb
2014-09-15AC334622.34 ppb
2014-09-15AC334611.12 ppb
2014-09-15AC334601.74 ppb
2014-11-25AC382871.14 ppb
2014-11-25AC382881.66 ppb
2014-11-25AC382892.81 ppb
2014-11-25AC382861.38 ppb
2015-02-24AC420152.22 ppb
2015-02-24AC420162.59 ppb
2015-02-24AC420141.83 ppb
2015-02-24AC420132.37 ppb
2015-05-27AC465784.30 ppb
2015-05-27AC465774.08 ppb
2015-05-27AC465762.34 ppb
2015-05-27AC465753.81 ppb
2015-09-02AC575592.15 ppb
2015-09-02AC575580.730 ppb
2015-09-02AC575572.03 ppb
2015-09-02AC575601.98 ppb
2015-11-30AC62842ND
2015-11-30AC628430.900 ppb
2015-11-30AC628412.51 ppb
2015-11-30AC62844ND
2016-03-02AC663892.06 ppb
2016-03-02AC66388ND
2016-03-02AC663872.00 ppb
2016-03-02AC663901.92 ppb
2016-06-07AC720833.11 ppb
2016-06-07AC720821.28 ppb
2016-06-07AC720842.58 ppb
2016-06-07AC720812.80 ppb
2016-08-25AC81727ND
2016-08-25AC81729ND
2016-08-25AC81728ND
2016-08-25AC81726ND
2016-11-07AC869800.870 ppb
2016-11-07AC86981ND
2016-11-07AC86982ND
2016-11-07AC86983ND
2017-02-24AC908331.48 ppb
2017-02-24AC90831ND
2017-02-24AC908302.60 ppb
2017-02-24AC908322.57 ppb
2017-05-25AC958092.37 ppb
2017-05-25AC958072.23 ppb
2017-05-25AC958081.88 ppb
2017-05-25AC958101.78 ppb
2017-09-07AD035602.53 ppb
2017-09-07AD035622.18 ppb
2017-09-07AD03561ND
2017-09-07AD035631.13 ppb
2017-11-27AD09520ND
2017-11-27AD09522ND
2017-11-27AD09521ND
2017-11-27AD09523ND
2018-03-05AD143061.40 ppb
2018-03-05AD143081.82 ppb
2018-03-05AD14309ND
2018-03-05AD14307ND
2018-06-04AD205401.68 ppb
2018-06-04AD205391.60 ppb
2018-06-04AD205381.57 ppb
2018-06-04AD205371.61 ppb
2018-08-28AD31349ND
2018-08-28AD31350ND
2018-08-28AD313511.12 ppb
2018-08-28AD31352ND
2018-12-04AD35748ND
2018-12-04AD35747ND
2018-12-04AD35749ND
2018-12-04AD35750ND
2019-02-25AD394172.03 ppb
2019-02-25AD394151.93 ppb
2019-02-25AD39416ND
2019-02-25AD394182.38 ppb
2019-05-21AD474932.15 ppb
2019-05-21AD47496ND
2019-05-21AD474951.99 ppb
2019-05-21AD47494ND
2019-09-05AD540841.83 ppb
2019-09-05AD54085ND
2019-09-05AD540862.62 ppb
2019-09-05AD54087ND
2019-12-18AD581292.26 ppb
2019-12-18AD581301.37 ppb
2019-12-18AD581312.08 ppb
2019-12-18AD581321.71 ppb