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EWG's Tap Water Database — 2021 UPDATE

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Monochloroacetic acid

Mount Vernon

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

 

96

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.144 ppb161ND - 2.30 ppb
20150.125 ppb161ND - 2.00 ppb
20160.150 ppb161ND - 2.40 ppb
2017ND160ND
20180.313 ppb162ND - 2.60 ppb
20190.369 ppb162ND - 3.10 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
2014-02-25SB40718-01_01ND
2014-02-25SB40718-02_01ND
2014-02-25SB40718-03_01ND
2014-02-25SB40718-04_01ND
2014-05-22SE41084-01_01ND
2014-05-22SE41084-02_01ND
2014-05-22SE41084-03_012.30 ppb
2014-05-22SE41084-04_01ND
2014-08-25SH41810-01_01ND
2014-08-25SH41810-03_01ND
2014-08-25SH41810-04_01ND
2014-09-29SI41417-01_01ND
2014-11-20SK40685-02_01ND
2014-11-20SK40685-04_01ND
2014-11-20SK40685-03_01ND
2014-11-20SK40685-01_01ND
2015-02-24SB50492-01_01ND
2015-02-24SB50492-04_01ND
2015-02-24SB50492-02_01ND
2015-02-24SB50492-03_01ND
2015-05-19SE50766-01_01ND
2015-05-19SE50766-04_01ND
2015-05-19SE50766-03_01ND
2015-05-19SE50766-02_01ND
2015-08-12SH50799-02_01ND
2015-08-12SH50799-03_01ND
2015-08-12SH50799-01_012.00 ppb
2015-08-12SH50799-04_01ND
2015-11-05SK50262-02_01ND
2015-11-05SK50262-03_01ND
2015-11-05SK50262-01_01ND
2015-11-05SK50262-04_01ND
2016-02-2316B0609-04_01ND
2016-02-2316B0609-03_01ND
2016-02-2316B0609-02_01ND
2016-02-2316B0609-01_01ND
2016-05-2316E0937-02_01ND
2016-05-2316E0937-04_01ND
2016-05-2316E0937-01_01ND
2016-05-2316E0937-03_01ND
2016-08-1716H0919-04_01ND
2016-08-1716H0919-01_01ND
2016-08-1716H0919-02_01ND
2016-08-1716H0919-03_01ND
2016-11-1716K0643-01_01ND
2016-11-1716K0643-04_01ND
2016-11-1716K0643-02_01ND
2016-11-1716K0643-03_012.40 ppb
2017-02-2317B0545-01_01ND
2017-02-2317B0545-04_01ND
2017-02-2317B0545-03_01ND
2017-02-2317B0545-02_01ND
2017-05-2517E0975-03_01ND
2017-05-2517E0975-04_01ND
2017-05-2517E0975-01_01ND
2017-05-2517E0975-02_01ND
2017-09-2817I1105-02_01ND
2017-09-2817I1105-04_01ND
2017-09-2817I1105-01_01ND
2017-09-2817I1105-03_01ND
2017-11-2717K0659-01_01ND
2017-11-2717K0659-03_01ND
2017-11-2717K0659-02_01ND
2017-11-2717K0659-04_01ND
2018-02-2618B0525-04_01ND
2018-02-2618B0525-03_01ND
2018-02-2618B0525-02_01ND
2018-02-2618B0525-01_01ND
2018-05-1518E0654-04ND
2018-05-1518E0654-012.40 ppb
2018-05-1518E0654-02ND
2018-05-1518E0654-03ND
2018-08-2018H0955-04ND
2018-08-2018H0955-032.60 ppb
2018-08-2018H0955-02ND
2018-08-2018H0955-01ND
2018-11-0718K0223-01_01ND
2018-11-0718K0223-02_01ND
2018-11-0718K0223-03_01ND
2018-11-0718K0223-04_01ND
2019-02-1919B0378-01ND
2019-02-1919B0378-02ND
2019-02-1919B0378-03ND
2019-02-1919B0378-04ND
2019-05-1619E0627-01ND
2019-05-1619E0627-04ND
2019-05-1619E0627-033.10 ppb
2019-05-1619E0627-022.80 ppb
2019-08-1419H0677-02ND
2019-08-1419H0677-04ND
2019-08-1419H0677-03ND
2019-08-1419H0677-01ND
2019-11-2119K0649-04ND
2019-11-2119K0649-03ND
2019-11-2119K0649-02ND
2019-11-2119K0649-01ND