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EWG's Tap Water Database — 2021 UPDATE

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Dichloroacetic acid

North Alamo Water Supply Company

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

 

192

Samples

0

Samples exceeding legal limit (MCL)

169

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20149.44 ppb3228ND - 31.6 ppb
20156.77 ppb3227ND - 13.6 ppb
20165.67 ppb3228ND - 13.0 ppb
20178.07 ppb3230ND - 31.7 ppb
20188.19 ppb3228ND - 18.7 ppb
20196.69 ppb3228ND - 11.4 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
2014-02-25AC44500ND
2014-02-25AC445019.70 ppb
2014-02-25AC444829.80 ppb
2014-02-25AC4448511.1 ppb
2014-02-25AC444819.90 ppb
2014-02-25AC444832.40 ppb
2014-02-25AC4448412.6 ppb
2014-02-25AC444788.20 ppb
2014-05-06AC53215ND
2014-05-06AC5321431.6 ppb
2014-05-06AC5321330.0 ppb
2014-05-06AC5321210.1 ppb
2014-05-06AC532164.70 ppb
2014-05-06AC532179.40 ppb
2014-06-17AC571716.60 ppb
2014-06-17AC5717211.7 ppb
2014-09-22AC677041.40 ppb
2014-09-22AC6770118.0 ppb
2014-09-22AC6770211.6 ppb
2014-09-22AC677056.70 ppb
2014-09-22AC6773110.1 ppb
2014-09-22AC6770310.3 ppb
2014-09-22AC6770013.2 ppb
2014-09-22AC6772910.9 ppb
2014-11-21AC72709ND
2014-11-21AC7278413.4 ppb
2014-11-21AC7270219.0 ppb
2014-11-21AC727853.70 ppb
2014-11-21AC727014.90 ppb
2014-11-21AC72707ND
2014-11-21AC727085.50 ppb
2014-11-21AC727035.50 ppb
2015-03-11AC83711ND
2015-03-11AC8370910.4 ppb
2015-03-11AC8371211.9 ppb
2015-03-11AC837356.70 ppb
2015-03-11AC837105.20 ppb
2015-03-11AC837373.90 ppb
2015-03-11AC837138.70 ppb
2015-03-11AC837075.30 ppb
2015-05-06AC90712ND
2015-05-06AC907173.70 ppb
2015-05-06AC907158.10 ppb
2015-05-06AC907197.60 ppb
2015-05-06AC907188.10 ppb
2015-05-06AC907103.40 ppb
2015-05-06AC907209.30 ppb
2015-05-06AC907148.50 ppb
2015-07-15AC99617ND
2015-07-15AC9961612.1 ppb
2015-07-15AC996117.80 ppb
2015-07-15AC9961210.5 ppb
2015-07-15AC9961013.6 ppb
2015-07-15AC9961810.2 ppb
2015-07-16AC9990512.2 ppb
2015-07-16AC999008.40 ppb
2015-10-22AD11481ND
2015-10-22AD11478ND
2015-10-22AD114837.30 ppb
2015-10-22AD114805.70 ppb
2015-10-22AD114739.00 ppb
2015-10-22AD114772.70 ppb
2015-10-22AD114748.20 ppb
2015-10-22AD114858.00 ppb
2016-01-27AD20354ND
2016-01-27AD203591.20 ppb
2016-01-27AD203386.60 ppb
2016-01-27AD203603.10 ppb
2016-01-27AD203575.80 ppb
2016-01-27AD203483.00 ppb
2016-01-27AD203612.10 ppb
2016-01-27AD203586.20 ppb
2016-04-27AD34392ND
2016-04-27AD34390ND
2016-04-27AD3438910.1 ppb
2016-04-27AD343788.70 ppb
2016-04-27AD3438210.1 ppb
2016-04-27AD343913.70 ppb
2016-04-27AD3438710.8 ppb
2016-04-27AD3438810.2 ppb
2016-08-03AD46840ND
2016-08-03AD468232.60 ppb
2016-08-03AD4683613.0 ppb
2016-08-03AD468416.10 ppb
2016-08-03AD468207.40 ppb
2016-08-03AD468224.70 ppb
2016-08-03AD4684210.3 ppb
2016-08-03AD468218.30 ppb
2016-10-25AD545422.00 ppb
2016-10-25AD545381.30 ppb
2016-10-25AD545368.90 ppb
2016-10-25AD545355.90 ppb
2016-10-25AD545398.90 ppb
2016-10-25AD545374.00 ppb
2016-10-25AD545347.60 ppb
2016-10-25AD545418.80 ppb
2017-02-07AD691475.20 ppb
2017-02-07AD691453.50 ppb
2017-02-07AD6915016.5 ppb
2017-02-07AD691485.90 ppb
2017-02-07AD6915110.00 ppb
2017-02-07AD691492.90 ppb
2017-02-07AD691575.50 ppb
2017-02-07AD691468.60 ppb
2017-04-20AD803284.80 ppb
2017-04-20AD8032511.1 ppb
2017-04-20AD8032731.7 ppb
2017-04-20AD803295.60 ppb
2017-04-20AD8034712.3 ppb
2017-04-20AD803332.50 ppb
2017-04-20AD803309.80 ppb
2017-04-20AD8032611.6 ppb
2017-07-11AD88848ND
2017-07-11AD888611.40 ppb
2017-07-11AD8886728.0 ppb
2017-07-11AD888685.30 ppb
2017-07-11AD888599.60 ppb
2017-07-11AD888603.80 ppb
2017-07-11AD888648.80 ppb
2017-07-11AD888548.30 ppb
2017-10-03AD99011ND
2017-10-03AD990165.90 ppb
2017-10-03AD990143.50 ppb
2017-10-03AD990157.50 ppb
2017-10-03AD990178.40 ppb
2017-10-03AD990124.30 ppb
2017-10-03AD990187.70 ppb
2017-10-03AD990138.20 ppb
2018-01-23AE09830ND
2018-01-23AE0982710.9 ppb
2018-01-23AE098153.50 ppb
2018-01-23AE098116.30 ppb
2018-01-23AE098129.80 ppb
2018-01-23AE098081.50 ppb
2018-01-23AE0981414.3 ppb
2018-01-23AE0982311.1 ppb
2018-04-10AE21835ND
2018-04-10AE2183315.7 ppb
2018-04-10AE2183918.7 ppb
2018-04-10AE218367.20 ppb
2018-04-10AE2183212.0 ppb
2018-04-10AE218342.70 ppb
2018-04-10AE2183813.9 ppb
2018-04-10AE218379.80 ppb
2018-07-11AE32925ND
2018-07-11AE329239.20 ppb
2018-07-11AE3292416.1 ppb
2018-07-11AE329318.40 ppb
2018-07-11AE3293312.1 ppb
2018-07-11AE329323.00 ppb
2018-07-11AE3293413.6 ppb
2018-07-11AE3293013.5 ppb
2018-11-06AE453796.10 ppb
2018-11-06AE453728.80 ppb
2018-11-06AE453769.40 ppb
2018-11-06AE453756.50 ppb
2018-11-06AE453785.50 ppb
2018-11-06AE453745.60 ppb
2018-11-06AE453776.80 ppb
2018-11-06AE45373ND
2019-02-12AE540708.90 ppb
2019-02-12AE540409.20 ppb
2019-02-12AE540418.60 ppb
2019-02-12AE540446.70 ppb
2019-02-12AE540433.20 ppb
2019-02-12AE540346.70 ppb
2019-02-12AE540352.00 ppb
2019-02-12AE54045ND
2019-04-30AE640848.30 ppb
2019-04-30AE6409311.0 ppb
2019-04-30AE640996.70 ppb
2019-04-30AE6409411.4 ppb
2019-04-30AE640823.50 ppb
2019-04-30AE640929.40 ppb
2019-04-30AE6409510.5 ppb
2019-04-30AE64083ND
2019-09-03AE817059.60 ppb
2019-09-03AE817069.50 ppb
2019-09-03AE817038.20 ppb
2019-09-03AE817047.60 ppb
2019-09-03AE817013.10 ppb
2019-09-03AE817079.00 ppb
2019-09-03AE8170210.1 ppb
2019-09-03AE81700ND
2019-11-05AE8845910.1 ppb
2019-11-05AE8846011.2 ppb
2019-11-05AE884578.10 ppb
2019-11-05AE884587.20 ppb
2019-11-05AE884531.70 ppb
2019-11-05AE884566.60 ppb
2019-11-05AE884556.00 ppb
2019-11-05AE88454ND