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EWG's Tap Water Database — 2021 UPDATE

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Dichloroacetic acid

City of Patterson

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)

1

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
2014ND160ND
2015ND160ND
2016ND160ND
2017ND160ND
2018ND160ND
20190.0625 ppb161ND - 1.000 ppb

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
2014-03-195867-902-1004ND
2014-03-195867-900-0950ND
2014-03-195867-901-0755ND
2014-03-195867-903-1015ND
2014-06-175867-903-0818ND
2014-06-175867-902-0750ND
2014-06-175867-901-0712ND
2014-06-175867-900-0727ND
2014-07-155867-903-0813ND
2014-07-155867-902-0804ND
2014-07-155867-901-0732ND
2014-07-155867-900-0749ND
2014-10-075867-902-1001ND
2014-10-075867-901-0750ND
2014-10-075867-903-1012ND
2014-10-075867-900-0839ND
2015-01-205867-903-0816ND
2015-01-205867-902-0842ND
2015-01-205867-901-0800ND
2015-01-205867-900-0911ND
2015-04-145867-903-0854ND
2015-04-145867-902-0833ND
2015-04-145867-900-0819ND
2015-04-145867-901-0910ND
2015-07-145867-900-0839ND
2015-07-145867-903-0809ND
2015-07-145867-902-0820ND
2015-07-145867-901-0833ND
2015-10-135867-901-0809ND
2015-10-135867-900-0912ND
2015-10-135867-903-0938ND
2015-10-135867-902-0927ND
2016-01-125867-901-0948ND
2016-01-125867-900-0936ND
2016-01-125867-903-1000ND
2016-01-125867-902-0921ND
2016-04-185867-901-0753ND
2016-04-185867-900-0810ND
2016-04-185867-903-0840ND
2016-04-185867-902-0825ND
2016-07-125867-903-0914ND
2016-07-125867-901-0854ND
2016-07-125867-900-0818ND
2016-07-125867-902-0904ND
2016-10-185867-903-1043ND
2016-10-185867-901-1053ND
2016-10-185867-902-1030ND
2016-10-195867-900-1126ND
2017-01-105867-902-1002ND
2017-01-105867-903-1012ND
2017-01-105867-901-0939ND
2017-01-105867-900-0921ND
2017-04-115867-902-0818ND
2017-04-115867-900-0714ND
2017-04-115867-901-0754ND
2017-04-115867-903-0807ND
2017-07-115867-900-0830ND
2017-07-115867-901-0715ND
2017-07-115867-903-0900ND
2017-07-115867-902-0736ND
2017-10-035867-903-0926ND
2017-10-035867-900-0807ND
2017-10-035867-902-0754ND
2017-10-035867-901-0821ND
2018-01-095867-903-1048ND
2018-01-095867-900-1120ND
2018-01-095867-901-1132ND
2018-01-095867-902-1103ND
2018-04-035867-901-0752ND
2018-04-035867-902-0838ND
2018-04-035867-903-0850ND
2018-04-035867-900-0822ND
2018-07-035867-901-0730ND
2018-07-035867-903-0745ND
2018-07-035867-902-0800ND
2018-07-035867-900-0815ND
2018-10-025867-901-0943ND
2018-10-025867-903-0810ND
2018-10-025867-902-0838ND
2018-10-025867-900-1000ND
2019-01-085867-900-0945ND
2019-01-085867-902-1015ND
2019-01-085867-901-1000ND
2019-01-085867-903-10301.000 ppb
2019-04-025867-900-0950ND
2019-04-025867-902-1010ND
2019-04-025867-903-1025ND
2019-04-025867-901-0753ND
2019-07-025867-903-0905ND
2019-07-025867-902-0850ND
2019-07-025867-900-0810ND
2019-07-025867-901-0825ND
2019-10-015867-903-0950ND
2019-10-015867-902-0925ND
2019-10-015867-900-0900ND
2019-10-015867-901-0830ND