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EWG's Tap Water Database — 2021 UPDATE

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Dichloroacetic acid

Norwalk Water Department

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

 

176

Samples

0

Samples exceeding legal limit (MCL)

79

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20141.88 ppb166ND - 10.00 ppb
20151.26 ppb329ND - 7.70 ppb
20160.903 ppb3216ND - 3.30 ppb
20172.87 ppb3216ND - 17.4 ppb
20181.28 ppb3216ND - 3.80 ppb
20191.55 ppb3216ND - 8.30 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
2014-02-043761-800-0910ND
2014-02-043761-801-08152.30 ppb
2014-02-043761-802-0857ND
2014-02-043761-803-0844ND
2014-02-043761-804-10105.10 ppb
2014-02-043761-805-0950ND
2014-02-043761-806-0935ND
2014-02-043761-807-0830ND
2014-08-123761-800-09251.50 ppb
2014-08-123761-801-08359.50 ppb
2014-08-123761-802-09131.70 ppb
2014-08-123761-803-0900ND
2014-08-123761-804-102010.00 ppb
2014-08-123761-805-1000ND
2014-08-123761-806-0940ND
2014-08-123761-807-0850ND
2015-01-273761-800-09351.90 ppb
2015-01-273761-801-09005.00 ppb
2015-01-273761-802-0950ND
2015-01-273761-803-0920ND
2015-01-273761-804-10355.40 ppb
2015-01-273761-805-1015ND
2015-01-273761-806-1000ND
2015-01-273761-807-1100ND
2015-05-053761-800-0915ND
2015-05-053761-801-08207.70 ppb
2015-05-053761-802-0905ND
2015-05-053761-803-0840ND
2015-05-053761-804-10057.30 ppb
2015-05-053761-805-0945ND
2015-05-053761-806-0930ND
2015-05-053761-807-0850ND
2015-08-113761-800-0910ND
2015-08-113761-801-08004.40 ppb
2015-08-113761-802-0855ND
2015-08-113761-803-0826ND
2015-08-113761-804-09505.50 ppb
2015-08-113761-805-0935ND
2015-08-113761-806-0926ND
2015-08-113761-807-0840ND
2015-11-033761-800-1030ND
2015-11-033761-801-08151.30 ppb
2015-11-033761-802-1018ND
2015-11-033761-803-0850ND
2015-11-033761-804-10001.70 ppb
2015-11-033761-805-0940ND
2015-11-033761-806-0920ND
2015-11-033761-807-0830ND
2016-02-023761-800-08451.10 ppb
2016-02-023761-801-07551.50 ppb
2016-02-023761-802-08301.000 ppb
2016-02-023761-803-0810ND
2016-02-023761-804-09401.50 ppb
2016-02-023761-805-0920ND
2016-02-023761-806-0900ND
2016-02-023761-807-1000ND
2016-05-033761-800-11001.30 ppb
2016-05-033761-801-09211.80 ppb
2016-05-033761-802-10451.000 ppb
2016-05-033761-803-1010ND
2016-05-033761-804-12481.90 ppb
2016-05-033761-805-1230ND
2016-05-033761-806-1121ND
2016-05-033761-807-1027ND
2016-08-023761-800-08351.40 ppb
2016-08-023761-801-08202.80 ppb
2016-08-023761-802-08501.000 ppb
2016-08-023761-803-0750ND
2016-08-023761-804-10052.40 ppb
2016-08-023761-805-0945ND
2016-08-023761-806-0920ND
2016-08-023761-807-0805ND
2016-11-013761-800-09002.40 ppb
2016-11-013761-801-08053.30 ppb
2016-11-013761-802-09152.30 ppb
2016-11-013761-803-0830ND
2016-11-013761-804-10302.20 ppb
2016-11-013761-805-1000ND
2016-11-013761-806-0935ND
2016-11-013761-807-0845ND
2017-02-143761-800-09001.30 ppb
2017-02-143761-801-08052.40 ppb
2017-02-143761-802-09201.30 ppb
2017-02-143761-803-0845ND
2017-02-143761-804-10253.10 ppb
2017-02-143761-805-1005ND
2017-02-143761-806-0940ND
2017-02-143761-807-0825ND
2017-05-093761-800-091015.4 ppb
2017-05-093761-801-07406.80 ppb
2017-05-093761-802-114015.7 ppb
2017-05-093761-803-0810ND
2017-05-093761-804-111817.4 ppb
2017-05-093761-805-1050ND
2017-05-093761-806-0925ND
2017-05-093761-807-0845ND
2017-08-083761-800-09002.00 ppb
2017-08-083761-801-08001.80 ppb
2017-08-083761-802-09201.90 ppb
2017-08-083761-803-0840ND
2017-08-083761-804-09352.40 ppb
2017-08-083761-805-1000ND
2017-08-083761-806-1025ND
2017-08-083761-807-0830ND
2017-11-143761-800-08255.10 ppb
2017-11-143761-801-07305.20 ppb
2017-11-143761-802-09005.10 ppb
2017-11-143761-803-0810ND
2017-11-143761-804-10005.00 ppb
2017-11-143761-805-0940ND
2017-11-143761-806-0920ND
2017-11-143761-807-0750ND
2018-02-063761-800-09352.20 ppb
2018-02-063761-801-08402.50 ppb
2018-02-063761-802-09502.00 ppb
2018-02-063761-803-0915ND
2018-02-063761-804-10502.20 ppb
2018-02-063761-805-1030ND
2018-02-063761-806-1010ND
2018-02-063761-807-0900ND
2018-05-013761-800-10262.30 ppb
2018-05-013761-801-10052.50 ppb
2018-05-013761-802-10372.10 ppb
2018-05-013761-803-1350ND
2018-05-013761-804-13002.50 ppb
2018-05-013761-805-1245ND
2018-05-013761-806-1117ND
2018-05-013761-807-1410ND
2018-08-073761-800-10233.80 ppb
2018-08-073761-801-08423.20 ppb
2018-08-073761-802-12453.00 ppb
2018-08-073761-803-0936ND
2018-08-073761-804-12253.50 ppb
2018-08-073761-805-1200ND
2018-08-073761-806-1048ND
2018-08-073761-807-1310ND
2018-11-063761-800-09102.30 ppb
2018-11-063761-801-08002.30 ppb
2018-11-063761-802-08552.40 ppb
2018-11-063761-803-0835ND
2018-11-063761-804-10052.30 ppb
2018-11-063761-805-0947ND
2018-11-063761-806-0930ND
2018-11-063761-807-0820ND
2019-02-053761-800-09222.70 ppb
2019-02-053761-801-08303.30 ppb
2019-02-053761-802-09402.60 ppb
2019-02-053761-803-0910ND
2019-02-053761-804-10362.50 ppb
2019-02-053761-805-1021ND
2019-02-053761-806-1000ND
2019-02-053761-807-0856ND
2019-05-073761-800-08358.30 ppb
2019-05-073761-801-07305.30 ppb
2019-05-073761-802-08504.30 ppb
2019-05-073761-803-0755ND
2019-05-073761-804-09504.30 ppb
2019-05-073761-805-0932ND
2019-05-073761-806-0915ND
2019-05-073761-807-0810ND
2019-08-063761-800-08501.90 ppb
2019-08-063761-801-07542.00 ppb
2019-08-063761-802-09162.00 ppb
2019-08-063761-803-0833ND
2019-08-063761-804-10252.10 ppb
2019-08-063761-805-1000ND
2019-08-063761-806-0940ND
2019-08-063761-807-0820ND
2019-11-053761-800-09302.00 ppb
2019-11-053761-801-08301.80 ppb
2019-11-053761-802-09452.10 ppb
2019-11-053761-803-0850ND
2019-11-053761-804-10552.30 ppb
2019-11-053761-805-1030ND
2019-11-053761-806-1005ND
2019-11-053761-807-0910ND