Know Your Environment. Protect Your Health.

Monochloroacetic acid

King County Water District 111

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.

 

28

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND20ND
2019ND20ND
2020N/A00N/A
2021ND80ND
2022ND80ND
2023ND80ND

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
2018-11-07ND
2018-11-07ND
2019-10-16ND
2019-10-16ND
2021-03-234090972ND
2021-03-234090971ND
2021-05-244126085ND
2021-05-244126086ND
2021-08-034159278ND
2021-08-034159277ND
2021-11-084206487ND
2021-11-084206488ND
2022-02-074241787ND
2022-02-074241788ND
2022-05-204286865ND
2022-05-204286866ND
2022-08-084363810ND
2022-08-084363811ND
2022-11-024374775ND
2022-11-024374776ND
2023-02-094411901ND
2023-02-094411902ND
2023-05-174455201ND
2023-05-174455204ND
2023-09-064517239ND
2023-09-064517240ND
2023-11-084548879ND
2023-11-084548880ND