Know Your Environment. Protect Your Health.

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.

 

80

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.599 ppb165ND - 2.32 ppb
2019ND160ND
2020N/A00N/A
20210.843 ppb167ND - 2.33 ppb
20220.921 ppb168ND - 2.24 ppb
2023ND160ND

ppb = parts per billion

State, National, and Health Guidelines for Drinking Water

EWG Health Guideline: 53 ppb

The EWG Health Guideline of 53 ppb for monochloroacetic acid was defined by the California Office of Environmental Health Hazard Assessment's public health goal, the level of a drinking water contaminant that does not pose a significant health risk.a public health goal. This health guideline protects against change to fetal growth and development.

ppb = parts per billion

All test results

Date Lab ID Result
2018-01-10ND
2018-01-10ND
2018-01-10ND
2018-01-10ND
2018-04-10ND
2018-04-10ND
2018-04-10ND
2018-04-102.00 ppb
2018-07-101.62 ppb
2018-07-101.56 ppb
2018-07-102.09 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
2021-01-0640642581.58 ppb
2021-01-064064256ND
2021-01-0640642552.04 ppb
2021-01-0640642571.50 ppb
2021-04-074101580ND
2021-04-074101579ND
2021-04-074101581ND
2021-04-074101582ND
2021-07-0841722441.95 ppb
2021-07-0841722462.33 ppb
2021-07-0841722452.26 ppb
2021-07-0841722431.82 ppb
2021-10-054195663ND
2021-10-054195666ND
2021-10-054195664ND
2021-10-054195665ND
2022-01-0542300171.96 ppb
2022-01-0542300191.78 ppb
2022-01-054230018ND
2022-01-054230020ND
2022-04-124270495ND
2022-04-1242704962.21 ppb
2022-04-124270494ND
2022-04-1242704971.54 ppb
2022-07-1243102261.54 ppb
2022-07-1243102241.77 ppb
2022-07-1243102231.70 ppb
2022-07-1243102252.24 ppb
2022-10-044361910ND
2022-10-044361912ND
2022-10-044361911ND
2022-10-044361909ND
2023-01-054397668ND
2023-01-054397669ND
2023-01-054397671ND
2023-01-054397670ND
2023-04-134442054ND
2023-04-134442053ND
2023-04-134442052ND
2023-04-134442055ND
2023-07-124482778ND
2023-07-124482779ND
2023-07-124482780ND
2023-07-124482777ND
2023-10-044529318ND
2023-10-044529321ND
2023-10-044529320ND
2023-10-044529319ND