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EWG's Tap Water Database — 2021 UPDATE

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Monochloroacetic acid

Norwalk City

Monochloroacetic 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

 

92

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.313 ppb162ND - 2.50 ppb
20150.156 ppb161ND - 2.50 ppb
2016ND160ND
2017ND160ND
20180.663 ppb165ND - 2.50 ppb
20190.600 ppb123ND - 2.80 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 53 ppb

The EWG Health Guideline of 53 ppb for monochloroacetic 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.. This health guideline protects against system toxicity.

ppb = parts per billion

All test results

Date Lab ID Result
2014-02-06AG64239ND
2014-02-06AG642382.50 ppb
2014-02-06AG64241ND
2014-02-06AG642402.50 ppb
2014-05-07AG70263ND
2014-05-07AG70264ND
2014-05-07AG70265ND
2014-05-07AG70262ND
2014-08-01AG76692ND
2014-08-01AG76693ND
2014-08-01AG76694ND
2014-08-01AG76695ND
2014-11-05AG84540ND
2014-11-05AG84541ND
2014-11-05AG84539ND
2014-11-05AG84538ND
2015-02-04AG90163ND
2015-02-04AG90164ND
2015-02-04AG90165ND
2015-02-04AG901662.50 ppb
2015-05-06AG95919ND
2015-05-06AG95920ND
2015-05-06AG95921ND
2015-05-06AG95922ND
2015-08-05AH02944ND
2015-08-05AH02945ND
2015-08-05AH02946ND
2015-08-05AH02947ND
2015-11-04AH09515ND
2015-11-04AH09516ND
2015-11-04AH09517ND
2015-11-04AH09518ND
2016-02-03AH14967ND
2016-02-03AH14968ND
2016-02-03AH14969ND
2016-02-03AH14970ND
2016-05-04AH21101ND
2016-05-04AH21104ND
2016-05-04AH21103ND
2016-05-04AH21102ND
2016-08-03AH27543ND
2016-08-03AH27544ND
2016-08-03AH27545ND
2016-08-03AH27546ND
2016-11-02AH35045ND
2016-11-02AH35044ND
2016-11-02AH35042ND
2016-11-02AH35043ND
2017-02-01AH42082ND
2017-02-01AH42083ND
2017-02-01AH42084ND
2017-02-01AH42085ND
2017-05-03AH49011ND
2017-05-03AH49012ND
2017-05-03AH49013ND
2017-05-03AH49014ND
2017-08-02AH56581ND
2017-08-02AH56580ND
2017-08-02AH56579ND
2017-08-02AH56578ND
2017-11-01AH63372ND
2017-11-01AH63373ND
2017-11-01AH63374ND
2017-11-01AH63375ND
2018-02-0618-12105-01ND
2018-02-0618-12105-022.00 ppb
2018-02-0618-12105-032.50 ppb
2018-02-0618-12105-04ND
2018-05-01M18-17864-04ND
2018-05-01M18-17864-03ND
2018-05-01M18-17864-022.00 ppb
2018-05-01M18-17864-01ND
2018-08-0218-26411-02ND
2018-08-0218-26411-04ND
2018-08-0218-26411-03ND
2018-08-0218-26411-01ND
2018-11-0118-34210-032.10 ppb
2018-11-0118-34210-042.00 ppb
2018-11-0118-34210-01ND
2018-11-0118-34210-02ND
2019-02-0419-12312-03ND
2019-02-0419-12312-04ND
2019-02-0419-12312-022.10 ppb
2019-02-0419-12312-01ND
2019-05-0319-19019-01ND
2019-05-0319-19019-022.30 ppb
2019-05-0319-19019-03ND
2019-05-0319-19019-04ND
2019-08-0619-27051-02ND
2019-08-0719-27051-01ND
2019-08-0719-27051-03ND
2019-08-0719-27051-042.80 ppb