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EWG's Tap Water Database — 2021 UPDATE

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Monochloroacetic acid

City of Mercer Island

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

 

88

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
20142.25 ppb881.50 ppb - 4.80 ppb
20150.839 ppb165ND - 3.03 ppb
20161.31 ppb168ND - 3.20 ppb
2017ND160ND
20180.599 ppb165ND - 2.32 ppb
2019ND160ND

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
2014-01-15008511.50 ppb
2014-01-15008521.60 ppb
2014-04-15065872.00 ppb
2014-04-15065881.80 ppb
2014-07-17127482.20 ppb
2014-07-17127471.80 ppb
2014-10-16194544.80 ppb
2014-10-16194532.30 ppb
2015-02-2450801ND
2015-02-2450804ND
2015-02-2450802ND
2015-02-2450803ND
2015-04-1692502ND
2015-04-1692501ND
2015-04-1692504ND
2015-04-1692503ND
2015-07-14411022.91 ppb
2015-07-14411012.85 ppb
2015-07-14411043.03 ppb
2015-07-14411032.51 ppb
2015-10-1423003ND
2015-10-1423004ND
2015-10-14230012.12 ppb
2015-10-1423002ND
2016-01-13ND
2016-01-13ND
2016-01-13ND
2016-01-13ND
2016-04-14ND
2016-04-14ND
2016-04-14ND
2016-04-142.61 ppb
2016-07-133.20 ppb
2016-07-132.49 ppb
2016-07-132.96 ppb
2016-07-133.18 ppb
2016-10-11ND
2016-10-111.96 ppb
2016-10-112.66 ppb
2016-10-111.89 ppb
2017-01-10ND
2017-01-10ND
2017-01-10ND
2017-01-10ND
2017-04-12ND
2017-04-12ND
2017-04-12ND
2017-04-12ND
2017-07-26ND
2017-07-26ND
2017-07-26ND
2017-07-26ND
2017-10-10ND
2017-10-10ND
2017-10-10ND
2017-10-10ND
2018-01-10ND
2018-01-10ND
2018-01-10ND
2018-01-10ND
2018-04-102.00 ppb
2018-04-10ND
2018-04-10ND
2018-04-10ND
2018-07-101.56 ppb
2018-07-102.09 ppb
2018-07-101.62 ppb
2018-07-172.32 ppb
2018-10-11ND
2018-10-11ND
2018-10-11ND
2018-10-11ND
2019-01-09ND
2019-01-09ND
2019-01-09ND
2019-01-09ND
2019-04-11ND
2019-04-11ND
2019-04-11ND
2019-04-11ND
2019-07-10ND
2019-07-10ND
2019-07-10ND
2019-07-10ND
2019-10-17ND
2019-10-17ND
2019-10-17ND
2019-10-17ND