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EWG's Tap Water Database — 2021 UPDATE

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Dichloroacetic acid

Texas State University - San Marcos

Dichloroacetic 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)

14

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20140.463 ppb165ND - 2.00 ppb
20150.0625 ppb161ND - 1.000 ppb
20160.0813 ppb161ND - 1.30 ppb
20170.206 ppb163ND - 1.20 ppb
20180.269 ppb164ND - 1.20 ppb
2019ND160ND

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.2 ppb

The EWG Health Guideline of 0.2 ppb for dichloroacetic 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
2014-03-10AC461951.10 ppb
2014-03-10AC46193ND
2014-03-10AC461921.30 ppb
2014-03-10AC46191ND
2014-06-02AC556081.80 ppb
2014-06-02AC555811.20 ppb
2014-06-02AC55614ND
2014-06-02AC555822.00 ppb
2014-08-26AC65248ND
2014-08-26AC65242ND
2014-08-26AC65246ND
2014-08-26AC65243ND
2014-11-10AC71514ND
2014-11-10AC71511ND
2014-11-10AC71510ND
2014-11-10AC71516ND
2015-01-23AC77449ND
2015-01-23AC77453ND
2015-01-23AC77455ND
2015-01-23AC77452ND
2015-06-08AC94894ND
2015-06-08AC94898ND
2015-06-08AC94892ND
2015-06-08AC94896ND
2015-09-10AD06520ND
2015-09-10AD06522ND
2015-09-10AD06530ND
2015-09-10AD06515ND
2015-12-01AD14903ND
2015-12-01AD14873ND
2015-12-01AD14870ND
2015-12-01AD148981.000 ppb
2016-02-25AD25674ND
2016-02-25AD25705ND
2016-02-25AD25676ND
2016-02-25AD25673ND
2016-06-16AD40947ND
2016-06-16AD40944ND
2016-06-16AD40946ND
2016-06-16AD40950ND
2016-08-03AD46868ND
2016-08-03AD46865ND
2016-08-03AD46864ND
2016-08-03AD46866ND
2016-10-17AD53392ND
2016-10-17AD533931.30 ppb
2016-10-17AD53391ND
2016-10-17AD53390ND
2017-02-21AD71246ND
2017-02-21AD71250ND
2017-02-21AD71264ND
2017-02-21AD71252ND
2017-04-20AD80375ND
2017-04-20AD80376ND
2017-04-20AD80380ND
2017-04-20AD80378ND
2017-07-06AD88470ND
2017-07-06AD88467ND
2017-07-06AD88469ND
2017-07-06AD88472ND
2017-10-18AE01316ND
2017-10-18AE013211.10 ppb
2017-10-18AE013341.20 ppb
2017-10-18AE013131.000 ppb
2018-02-05AE12158ND
2018-02-05AE12151ND
2018-02-05AE12154ND
2018-02-05AE121611.10 ppb
2018-04-09AE21623ND
2018-04-09AE21634ND
2018-04-09AE21605ND
2018-04-09AE215961.20 ppb
2018-07-09AE325821.000 ppb
2018-07-09AE325841.000 ppb
2018-07-09AE32598ND
2018-07-09AE32597ND
2018-10-02AE42336ND
2018-10-02AE42332ND
2018-10-02AE42333ND
2018-10-02AE42339ND
2019-01-15AE49789ND
2019-01-15AE49783ND
2019-01-15AE49788ND
2019-01-15AE49787ND
2019-04-29AE63908ND
2019-04-29AE63893ND
2019-04-29AE63895ND
2019-04-29AE63911ND
2019-07-09AE73645ND
2019-07-09AE73651ND
2019-07-09AE73649ND
2019-07-09AE73650ND
2019-10-03AE85627ND
2019-10-03AE85622ND
2019-10-03AE85628ND
2019-10-03AE85623ND