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EWG's Tap Water Database — 2021 UPDATE

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Monochloroacetic acid

North City Water District

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

 

95

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20140.525 ppb164ND - 2.80 ppb
20150.862 ppb165ND - 3.99 ppb
20161.49 ppb1610ND - 3.77 ppb
20170.370 ppb153ND - 1.89 ppb
20180.226 ppb162ND - 1.96 ppb
20190.774 ppb165ND - 3.15 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
2014-02-1302881ND
2014-02-1302882ND
2014-02-13028802.10 ppb
2014-02-1302883ND
2014-05-1508664ND
2014-05-1508663ND
2014-05-15086622.80 ppb
2014-05-15086651.70 ppb
2014-08-1414904ND
2014-08-1414906ND
2014-08-1414903ND
2014-08-1414905ND
2014-11-1321769ND
2014-11-13217681.80 ppb
2014-11-1321771ND
2014-11-1321770ND
2015-02-1041401ND
2015-02-1041402ND
2015-02-1041403ND
2015-02-1041404ND
2015-05-14146041.65 ppb
2015-05-1414602ND
2015-05-14146012.72 ppb
2015-05-1414603ND
2015-08-13718013.99 ppb
2015-08-1371802ND
2015-08-1371804ND
2015-08-1371803ND
2015-11-10466033.50 ppb
2015-11-1046601ND
2015-11-10466021.93 ppb
2015-11-1046604ND
2016-02-12ND
2016-02-12ND
2016-02-12ND
2016-02-12ND
2016-05-11ND
2016-05-112.30 ppb
2016-05-111.50 ppb
2016-05-11ND
2016-08-091.92 ppb
2016-08-092.96 ppb
2016-08-092.13 ppb
2016-08-091.90 ppb
2016-11-081.72 ppb
2016-11-082.50 ppb
2016-11-083.06 ppb
2016-11-083.77 ppb
2017-02-141.89 ppb
2017-02-141.87 ppb
2017-02-141.79 ppb
2017-05-10ND
2017-05-10ND
2017-05-10ND
2017-05-10ND
2017-08-15ND
2017-08-15ND
2017-08-15ND
2017-08-15ND
2017-11-14ND
2017-11-14ND
2017-11-14ND
2017-11-14ND
2018-02-131.96 ppb
2018-02-13ND
2018-02-13ND
2018-02-13ND
2018-05-16ND
2018-05-16ND
2018-05-16ND
2018-05-16ND
2018-08-02ND
2018-08-02ND
2018-08-02ND
2018-08-021.66 ppb
2018-11-14ND
2018-11-14ND
2018-11-14ND
2018-11-14ND
2019-02-21ND
2019-02-21ND
2019-02-21ND
2019-02-21ND
2019-05-15ND
2019-05-152.38 ppb
2019-05-15ND
2019-05-15ND
2019-08-13ND
2019-08-133.15 ppb
2019-08-132.78 ppb
2019-08-13ND
2019-11-132.02 ppb
2019-11-132.06 ppb
2019-11-13ND
2019-11-13ND