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EWG's Tap Water Database — 2019 UPDATE

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Dichloroacetic acid

Lafayette

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.

 

120

Samples

0

Samples exceeding legal limit (MCL)

33

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.525 ppb3210ND - 3.20 ppb
20130.371 ppb246ND - 1.90 ppb
20140.794 ppb165ND - 2.90 ppb
20150.250 ppb163ND - 1.50 ppb
20160.613 ppb168ND - 2.10 ppb
20170.0875 ppb161ND - 1.40 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
2012-02-15AH53445ND
2012-02-15AH534462.00 ppb
2012-02-15AH534471.000 ppb
2012-02-15AH534483.20 ppb
2012-02-15AH534491.50 ppb
2012-02-15AH534501.40 ppb
2012-02-15AH534511.50 ppb
2012-02-15AH534521.40 ppb
2012-05-30AH65611ND
2012-05-30AH656122.50 ppb
2012-05-30AH65613ND
2012-05-30AH65614ND
2012-05-30AH65615ND
2012-05-30AH65616ND
2012-05-30AH65617ND
2012-05-30AH65618ND
2012-08-27AH75892ND
2012-08-27AH75893ND
2012-08-27AH758941.20 ppb
2012-08-27AH75895ND
2012-08-27AH75896ND
2012-08-27AH75897ND
2012-08-27AH75898ND
2012-08-27AH75899ND
2012-11-15AH84203ND
2012-11-15AH84204ND
2012-11-15AH84205ND
2012-11-15AH842061.10 ppb
2012-11-15AH84207ND
2012-11-15AH84208ND
2012-11-15AH84209ND
2012-11-15AH84210ND
2013-03-12AH90737ND
2013-03-12AH90738ND
2013-03-12AH90739ND
2013-03-12AH907401.50 ppb
2013-03-12AH90741ND
2013-03-12AH90742ND
2013-03-12AH90743ND
2013-03-12AH90744ND
2013-05-14AI01532ND
2013-05-14AI015331.40 ppb
2013-05-14AI01534ND
2013-05-14AI015351.90 ppb
2013-05-14AI01536ND
2013-05-14AI01537ND
2013-05-14AI01538ND
2013-05-14AI015391.30 ppb
2013-09-18AI16140ND
2013-09-18AI16141ND
2013-09-18AI161421.50 ppb
2013-09-18AI161431.30 ppb
2013-12-19AI25467ND
2013-12-19AI25468ND
2013-12-19AI25469ND
2013-12-19AI25470ND
2014-03-20AI36485ND
2014-03-20AI36486ND
2014-03-20AI36487ND
2014-03-20AI36488ND
2014-06-16AI43320ND
2014-06-16AI43321ND
2014-06-16AI43322ND
2014-06-16AI43323ND
2014-09-16AI54037ND
2014-09-16AI540382.40 ppb
2014-09-16AI54039ND
2014-09-16AI54040ND
2014-12-17AI617322.90 ppb
2014-12-17AI617332.50 ppb
2014-12-17AI617342.30 ppb
2014-12-17AI617352.60 ppb
2015-03-18AI69326ND
2015-03-18AI69327ND
2015-03-18AI69328ND
2015-03-18AI69329ND
2015-06-16AI79919ND
2015-06-16AI79920ND
2015-06-16AI799211.50 ppb
2015-06-16AI79922ND
2015-09-15AI89811ND
2015-09-15AI89812ND
2015-09-15AI89813ND
2015-09-15AI89814ND
2015-12-15AJ02945ND
2015-12-15AJ02946ND
2015-12-15AJ029471.40 ppb
2015-12-15AJ029481.10 ppb
2016-03-15AJ08200ND
2016-03-15AJ082011.20 ppb
2016-03-15AJ082021.000 ppb
2016-03-15AJ082031.10 ppb
2016-06-14AJ141461.000 ppb
2016-06-14AJ141471.10 ppb
2016-06-14AJ141481.20 ppb
2016-06-14AJ141491.10 ppb
2016-09-21AJ28481ND
2016-09-21AJ28482ND
2016-09-21AJ284832.10 ppb
2016-09-21AJ28484ND
2016-12-20AJ37244ND
2016-12-20AJ37245ND
2016-12-20AJ37246ND
2016-12-20AJ37247ND
2017-03-20AJ48347ND
2017-03-20AJ48348ND
2017-03-20AJ48349ND
2017-03-20AJ48350ND
2017-06-21AJ58213ND
2017-06-21AJ582141.40 ppb
2017-06-21AJ58215ND
2017-06-21AJ58216ND
2017-09-18AJ68294ND
2017-09-18AJ68295ND
2017-09-18AJ68296ND
2017-09-18AJ68297ND
2017-12-18AJ75637ND
2017-12-18AJ75638ND
2017-12-18AJ75639ND
2017-12-18AJ75640ND