Menu

EWG's Tap Water Database — 2021 UPDATE

Donate

Monochloroacetic acid

South Norwalk Electric and Water

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

 

80

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.575 ppb168ND - 1.80 ppb
2015N/A00N/A
20160.550 ppb1611ND - 1.50 ppb
20170.450 ppb169ND - 1.10 ppb
20180.488 ppb168ND - 1.20 ppb
20190.0813 ppb162ND - 0.700 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
2014-02-1014021026-HAA50.800 ppb
2014-02-1014021032-HAA51.20 ppb
2014-02-1014021037-HAA5ND
2014-02-1014021022-HAA50.900 ppb
2014-05-0714050722-HAA51.30 ppb
2014-05-0714050726-HAA51.10 ppb
2014-05-0714050732-HAA51.60 ppb
2014-05-0714050737-HAA5ND
2014-08-0414080437-HAA5ND
2014-08-0414080432-HAA5ND
2014-08-0414080426-HAA5ND
2014-08-0414080422-HAA51.80 ppb
2014-11-0314110322-HAA50.500 ppb
2014-11-0314110326-HAA5ND
2014-11-0314110332-HAA5ND
2014-11-0314110337-HAA5ND
2016-02-0116020122-HAA51.50 ppb
2016-02-0116020126-HAA50.600 ppb
2016-02-0116020132-HAA51.000 ppb
2016-02-0116020137-HAA50.600 ppb
2016-05-1116051126-HAA5ND
2016-05-1116051137-HAA5ND
2016-05-1116051132-HAA51.000 ppb
2016-05-1116051122-HAA50.700 ppb
2016-08-0316080326-HAA50.500 ppb
2016-08-0316080332-HAA50.600 ppb
2016-08-0316080337-HAA5ND
2016-08-0316080322-HAA50.800 ppb
2016-11-0216110222-HAA50.700 ppb
2016-11-0216110226-HAA50.800 ppb
2016-11-0216110232-HAA5ND
2016-11-0216110237-HAA5ND
2017-02-0617020622-HAA51.000 ppb
2017-02-0617020637-HAA5ND
2017-02-0617020632-HAA51.000 ppb
2017-02-0617020626-HAA5ND
2017-05-0217050222-HAA50.600 ppb
2017-05-0217050226-HAA50.600 ppb
2017-05-0217050232-HAA51.10 ppb
2017-05-0217050237-HAA50.600 ppb
2017-08-0217080237-HAA5ND
2017-08-0217080222-HAA50.900 ppb
2017-08-0217080226-HAA5ND
2017-08-0217080232-HAA5ND
2017-11-0717110726-HAA5ND
2017-11-0717110732-HAA50.600 ppb
2017-11-0717110737-HAA5ND
2017-11-0717110722-HAA50.800 ppb
2018-02-0618020622-HAA51.000 ppb
2018-02-0618020626-HAA50.700 ppb
2018-02-0618020632-HAA51.20 ppb
2018-02-0618020637-HAA51.20 ppb
2018-05-0918050926-HAA5ND
2018-05-0918050937-HAA5ND
2018-05-0918050932-HAA50.800 ppb
2018-05-0918050922-HAA51.10 ppb
2018-08-0718080722-HAA5ND
2018-08-0718080726-HAA5ND
2018-08-0718080732-HAA5ND
2018-08-0718080737-HAA5ND
2018-11-0618110632-HAA51.000 ppb
2018-11-0618110626-HAA5ND
2018-11-0618110622-HAA50.800 ppb
2018-11-2918112937-HAA5ND
2019-02-1319021322-HAA50.700 ppb
2019-02-1319021326-HAA5ND
2019-02-1319021332-HAA50.600 ppb
2019-02-1319021337-HAA5ND
2019-05-0719050737-HAA5ND
2019-05-0719050732-HAA5ND
2019-05-0719050726-HAA5ND
2019-05-0719050722-HAA5ND
2019-08-0619080622-HAA5ND
2019-08-0619080626-HAA5ND
2019-08-0619080632-HAA5ND
2019-08-0619080639-HAA5ND
2019-11-1319111322-HAA5ND
2019-11-1319111326-HAA5ND
2019-11-1319111332-HAA5ND
2019-11-1319111339-HAA5ND