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EWG's Tap Water Database — 2021 UPDATE

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Monochloroacetic acid

Point Roberts Water District No 4

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

 

40

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.450 ppb83ND - 1.20 ppb
20150.488 ppb82ND - 2.40 ppb
2016ND80ND
2017ND80ND
2018ND40ND
2019ND40ND

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
2014-01-02004431.20 ppb
2014-01-0200442ND
2014-05-0612377ND
2014-05-0612376ND
2014-07-02194021.20 ppb
2014-07-0219401ND
2014-10-20744221.20 ppb
2014-10-2074421ND
2015-01-1474709ND
2015-01-1474708ND
2015-05-0416944ND
2015-05-0416945ND
2015-07-0926465ND
2015-07-0926464ND
2015-10-14393452.40 ppb
2015-10-14393441.50 ppb
2016-01-26ND
2016-01-26ND
2016-05-09ND
2016-05-09ND
2016-07-12ND
2016-07-12ND
2016-10-07ND
2016-10-07ND
2017-01-25ND
2017-01-25ND
2017-04-12ND
2017-04-12ND
2017-07-27ND
2017-07-27ND
2017-10-05ND
2017-10-05ND
2018-01-23ND
2018-04-11ND
2018-07-09ND
2018-10-10ND
2019-01-16ND
2019-04-22ND
2019-08-08ND
2019-10-17ND