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EWG's Tap Water Database — 2021 UPDATE

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Dichloroacetic acid

City of South Pasadena

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)

12

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND160ND
2015ND160ND
2016ND160ND
20170.0750 ppb161ND - 1.20 ppb
20184.82 ppb1611ND - 15.0 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
2014-01-239588-802-1055ND
2014-01-239588-800-1140ND
2014-01-239588-801-1155ND
2014-01-239588-803-1205ND
2014-04-229588-803-1100ND
2014-04-229588-802-1115ND
2014-04-229588-801-1140ND
2014-04-229588-800-1125ND
2014-07-239588-803-0925ND
2014-07-239588-802-1010ND
2014-07-239588-801-0940ND
2014-07-239588-800-0955ND
2014-10-239588-802-1100ND
2014-10-239588-801-1130ND
2014-10-239588-803-1145ND
2014-10-239588-800-1115ND
2015-01-239588-803-1115ND
2015-01-239588-802-1020ND
2015-01-239588-801-1100ND
2015-01-239588-800-1050ND
2015-04-229588-803-1110ND
2015-04-229588-802-1035ND
2015-04-229588-800-1050ND
2015-04-229588-801-1100ND
2015-07-239588-800-1055ND
2015-07-239588-803-1125ND
2015-07-239588-802-1040ND
2015-07-239588-801-1110ND
2015-10-269588-801-1045ND
2015-10-269588-800-1035ND
2015-10-269588-803-1120ND
2015-10-269588-802-1025ND
2016-01-269588-801-1125ND
2016-01-269588-800-1110ND
2016-01-269588-803-1140ND
2016-01-269588-802-1055ND
2016-04-229588-801-1105ND
2016-04-229588-800-1050ND
2016-04-229588-803-1120ND
2016-04-229588-802-1035ND
2016-07-269588-803-1100ND
2016-07-269588-801-1045ND
2016-07-269588-800-1035ND
2016-07-269588-802-1025ND
2016-10-269588-803-1135ND
2016-10-269588-801-1125ND
2016-10-269588-802-1055ND
2016-10-269588-800-1110ND
2017-01-249588-802-1050ND
2017-01-249588-803-1135ND
2017-01-249588-801-1120ND
2017-01-249588-800-1105ND
2017-04-249588-802-1215ND
2017-04-249588-800-1230ND
2017-04-249588-801-1245ND
2017-04-249588-803-1255ND
2017-07-279588-800-12151.20 ppb
2017-07-279588-801-1235ND
2017-07-279588-803-1255ND
2017-07-279588-802-1155ND
2017-10-249588-803-1130ND
2017-10-249588-800-1100ND
2017-10-249588-802-1045ND
2017-10-249588-801-1115ND
2018-01-239588-803-1010ND
2018-01-239588-800-1050ND
2018-01-239588-801-1105ND
2018-01-239588-802-1035ND
2018-04-249588-801-11004.90 ppb
2018-04-249588-802-10403.70 ppb
2018-04-249588-803-11151.40 ppb
2018-04-249588-800-10503.70 ppb
2018-07-249588-801-10454.90 ppb
2018-07-249588-803-11006.90 ppb
2018-07-249588-802-10155.00 ppb
2018-07-249588-800-10304.60 ppb
2018-10-239588-801-105514.0 ppb
2018-10-239588-803-1110ND
2018-10-239588-802-102513.0 ppb
2018-10-239588-800-104015.0 ppb
2019-01-249588-800-1150ND
2019-01-249588-802-1125ND
2019-01-249588-801-1210ND
2019-01-249588-803-1230ND
2019-04-239588-800-1050ND
2019-04-239588-802-1035ND
2019-04-239588-803-1115ND
2019-04-239588-801-1100ND
2019-07-239588-803-1055ND
2019-07-239588-802-1135ND
2019-07-239588-800-1120ND
2019-07-239588-801-1110ND
2019-10-239588-803-1135ND
2019-10-239588-802-1045ND
2019-10-239588-800-1100ND
2019-10-239588-801-1115ND