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EWG's Tap Water Database — 2021 UPDATE

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Dichloroacetic acid

Valley Water Systems, Inc.

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

 

80

Samples

0

Samples exceeding legal limit (MCL)

24

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20140.431 ppb166ND - 1.40 ppb
2015N/A00N/A
20160.481 ppb164ND - 2.10 ppb
20170.250 ppb165ND - 1.10 ppb
20180.406 ppb166ND - 1.80 ppb
20190.213 ppb163ND - 1.30 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
2014-03-10AEL14001300-HAA5ND
2014-03-10AEL14001301-HAA5ND
2014-03-10AEL14001302-HAA5ND
2014-03-10AEL14001299-HAA5ND
2014-06-10AEL14003160-HAA51.40 ppb
2014-06-10AEL14003161-HAA5ND
2014-06-10AEL14003162-HAA5ND
2014-06-10AEL14003163-HAA51.40 ppb
2014-09-04AEL14004866-HAA51.20 ppb
2014-09-04AEL14004865-HAA50.800 ppb
2014-09-04AEL14004864-HAA50.700 ppb
2014-09-04AEL14004863-HAA51.40 ppb
2014-12-0414006514-HAA5ND
2014-12-0414006515-HAA5ND
2014-12-0414006516-HAA5ND
2014-12-0414006517-HAA5ND
2016-03-0116030105-005-HAAND
2016-03-0116030105-006-HAAND
2016-03-0116030105-007-HAAND
2016-03-0116030105-008-HAAND
2016-06-0216060208-006-HAAND
2016-06-0216060208-008-HAAND
2016-06-0216060208-007-HAAND
2016-06-0216060208-005-HAAND
2016-09-0216090203-002-HAAND
2016-09-0216090203-003-HAAND
2016-09-0216090203-004-HAA2.10 ppb
2016-09-0216090203-001-HAA2.00 ppb
2016-12-0116120122-005-HAA1.90 ppb
2016-12-0116120122-008-HAA1.70 ppb
2016-12-0116120122-006-HAAND
2016-12-0116120122-007-HAAND
2017-03-0117030107-005-HAAND
2017-03-0117030107-008-HAAND
2017-03-0117030107-007-HAAND
2017-03-0117030107-006-HAAND
2017-06-0117060109-005-HAAND
2017-06-0117060109-006-HAAND
2017-06-0117060109-007-HAAND
2017-06-0117060109-008-HAA0.800 ppb
2017-09-0617090610-008-HAA1.000 ppb
2017-09-0617090610-005-HAAND
2017-09-0617090610-006-HAAND
2017-09-0617090610-007-HAAND
2017-12-0117120101-006-HAA0.500 ppb
2017-12-0117120101-007-HAA0.600 ppb
2017-12-0117120101-008-HAA1.10 ppb
2017-12-0117120101-005-HAAND
2018-03-0118030113-002-HAAND
2018-03-0118030113-004-HAA0.600 ppb
2018-03-0118030113-006-HAA0.800 ppb
2018-03-0118030113-008-HAA0.900 ppb
2018-06-0418060408-004-HAAND
2018-06-0418060408-008-HAA1.000 ppb
2018-06-0418060408-006-HAAND
2018-06-0418060408-002-HAAND
2018-09-0518090509-001-HAA1.40 ppb
2018-09-0518090509-003-HAAND
2018-09-0518090509-005-HAAND
2018-09-0518090509-007-HAA1.80 ppb
2018-12-0618120609-008-HAAND
2018-12-0618120609-004-HAAND
2018-12-0618120609-002-HAAND
2018-12-0618120609-006-HAAND
2019-03-0119030105-002-HAAND
2019-03-0119030105-004-HAAND
2019-03-0119030105-008-HAAND
2019-03-0119030105-006-HAAND
2019-06-0419060410-008-HAAND
2019-06-0419060410-007-HAAND
2019-06-0419060410-006-HAAND
2019-06-0419060410-005-HAAND
2019-09-0419090413-005-HAA1.30 ppb
2019-09-0419090413-006-HAAND
2019-09-0419090413-007-HAAND
2019-09-0419090413-008-HAA1.10 ppb
2019-12-0419120410-005-HAAND
2019-12-0419120410-006-HAAND
2019-12-0419120410-007-HAAND
2019-12-0419120410-008-HAA1.000 ppb