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EWG's Tap Water Database — 2021 UPDATE

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Monochloroacetic acid

Boston Harbor

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
2014ND20ND
20150.250 ppb122ND - 1.60 ppb
20161.46 ppb84ND - 3.90 ppb
2017ND90ND
20180.557 ppb72ND - 2.00 ppb
2019ND20ND

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
2014-10-1613570ND
2014-12-2414682ND
2015-03-2515812ND
2015-03-31158481.60 ppb
2015-06-0216840ND
2015-06-0216842ND
2015-08-1117963ND
2015-08-1117965ND
2015-09-16185751.40 ppb
2015-09-1618574ND
2015-11-1019571ND
2015-11-1019572ND
2015-12-0719955ND
2015-12-0719953ND
2016-03-082.70 ppb
2016-03-153.00 ppb
2016-06-142.10 ppb
2016-06-143.90 ppb
2016-09-13ND
2016-09-13ND
2016-12-12ND
2016-12-12ND
2017-02-07ND
2017-02-07ND
2017-02-07ND
2017-06-27ND
2017-06-27ND
2017-08-16ND
2017-08-16ND
2017-11-15ND
2017-11-15ND
2018-03-30ND
2018-03-30ND
2018-06-112.00 ppb
2018-06-111.90 ppb
2018-08-28ND
2018-08-28ND
2018-08-28ND
2019-03-05ND
2019-03-05ND