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EWG's Tap Water Database — 2021 UPDATE

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Monochloroacetic acid

City of Mountlake Terrace

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

 

91

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
20140.163 ppb161ND - 2.60 ppb
2015ND150ND
2016ND160ND
20171.01 ppb125ND - 3.10 ppb
20180.150 ppb161ND - 2.40 ppb
20191.23 ppb167ND - 4.50 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
2014-03-1110639ND
2014-03-1110636ND
2014-03-1110638ND
2014-03-1110637ND
2014-06-1025432ND
2014-06-1025431ND
2014-06-1025433ND
2014-06-1025434ND
2014-09-0940595ND
2014-09-09406052.60 ppb
2014-09-0940602ND
2014-09-0940596ND
2014-12-0954632ND
2014-12-0954631ND
2014-12-0954630ND
2014-12-0954629ND
2015-03-1010322ND
2015-03-1010325ND
2015-03-1010323ND
2015-03-1010324ND
2015-06-0926479ND
2015-06-0926476ND
2015-06-0926477ND
2015-06-0926478ND
2015-09-0842595ND
2015-09-0842594ND
2015-09-0842592ND
2015-09-0842593ND
2015-12-0859270ND
2015-12-0859268ND
2015-12-0859269ND
2016-03-08ND
2016-03-08ND
2016-03-08ND
2016-03-08ND
2016-06-14ND
2016-06-14ND
2016-06-14ND
2016-06-14ND
2016-09-13ND
2016-09-13ND
2016-09-13ND
2016-09-13ND
2016-12-13ND
2016-12-13ND
2016-12-13ND
2016-12-13ND
2017-06-132.10 ppb
2017-06-132.20 ppb
2017-06-132.50 ppb
2017-06-133.10 ppb
2017-09-12ND
2017-09-122.20 ppb
2017-09-12ND
2017-09-12ND
2017-12-12ND
2017-12-12ND
2017-12-12ND
2017-12-12ND
2018-03-13ND
2018-03-13ND
2018-03-13ND
2018-03-13ND
2018-06-12ND
2018-06-12ND
2018-06-12ND
2018-06-12ND
2018-09-11ND
2018-09-11ND
2018-09-112.40 ppb
2018-09-11ND
2018-12-12ND
2018-12-12ND
2018-12-12ND
2018-12-12ND
2019-03-11ND
2019-03-11ND
2019-03-11ND
2019-03-11ND
2019-06-112.60 ppb
2019-06-112.50 ppb
2019-06-113.00 ppb
2019-06-112.50 ppb
2019-09-104.50 ppb
2019-09-10ND
2019-09-10ND
2019-09-102.40 ppb
2019-12-10ND
2019-12-10ND
2019-12-10ND
2019-12-102.10 ppb