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EWG's Tap Water Database — 2021 UPDATE

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Monochloroacetic acid

Crystal Clear WSC

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
20140.631 ppb162ND - 7.40 ppb
20150.125 ppb161ND - 2.00 ppb
20160.706 ppb163ND - 4.60 ppb
2017ND120ND
20181.95 ppb163ND - 12.4 ppb
20192.85 ppb167ND - 9.80 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
2014-03-17AC47108ND
2014-03-17AC47106ND
2014-03-17AC471297.40 ppb
2014-03-17AC47107ND
2014-05-16AC54548ND
2014-05-16AC54555ND
2014-05-16AC54505ND
2014-05-16AC54551ND
2014-07-23AC607792.70 ppb
2014-07-23AC60742ND
2014-07-23AC60781ND
2014-07-23AC60778ND
2014-10-29AC70867ND
2014-10-29AC70868ND
2014-10-29AC70864ND
2014-10-29AC70862ND
2015-01-26AC77745ND
2015-01-26AC77757ND
2015-01-26AC77753ND
2015-01-26AC77765ND
2015-04-22AC89205ND
2015-04-22AC89193ND
2015-04-22AC89192ND
2015-04-22AC891942.00 ppb
2015-07-30AD01748ND
2015-07-30AD01749ND
2015-07-30AD01750ND
2015-07-30AD01753ND
2015-12-07AD15678ND
2015-12-07AD15669ND
2015-12-07AD15665ND
2015-12-07AD15682ND
2016-03-16AD290284.50 ppb
2016-03-16AD29034ND
2016-03-16AD290314.60 ppb
2016-03-16AD290352.20 ppb
2016-04-08AD32505ND
2016-04-08AD32520ND
2016-04-08AD32507ND
2016-04-08AD32506ND
2016-07-25AD45409ND
2016-07-25AD45398ND
2016-07-25AD45423ND
2016-07-25AD45427ND
2016-10-21AD54551ND
2016-10-21AD54545ND
2016-10-21AD54553ND
2016-10-21AD54544ND
2017-02-07AD69184ND
2017-02-07AD69180ND
2017-02-07AD69182ND
2017-02-07AD69183ND
2017-05-08AD82979ND
2017-05-08AD82982ND
2017-05-08AD82984ND
2017-05-08AD82987ND
2017-11-17AE05354ND
2017-11-17AE05347ND
2017-11-17AE05351ND
2017-11-17AE05350ND
2018-02-13AE13539ND
2018-02-13AE13540ND
2018-02-13AE13541ND
2018-02-13AE13542ND
2018-06-12AE29449ND
2018-06-12AE29441ND
2018-06-12AE29442ND
2018-06-12AE29447ND
2018-08-09AE36304ND
2018-08-09AE36306ND
2018-08-09AE36302ND
2018-08-09AE36303ND
2018-11-13AE4591512.4 ppb
2018-11-13AE4591610.1 ppb
2018-11-13AE459188.70 ppb
2018-11-13AE45919ND
2019-03-13AE58418ND
2019-03-13AE584199.80 ppb
2019-03-13AE584149.40 ppb
2019-03-13AE584208.60 ppb
2019-04-11AE620222.30 ppb
2019-04-11AE61996ND
2019-04-11AE61999ND
2019-04-11AE62004ND
2019-07-22AE753084.70 ppb
2019-07-22AE753095.20 ppb
2019-07-22AE753065.60 ppb
2019-07-22AE75305ND
2019-11-22AE90385ND
2019-11-22AE90383ND
2019-11-22AE90386ND
2019-11-22AE90384ND