Know Your Environment. Protect Your Health.

Monochloroacetic acid

King County Water District #49

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
20180.808 ppb166ND - 2.81 ppb
20190.651 ppb165ND - 2.44 ppb
2020N/A00N/A
20211.25 ppb1610ND - 2.23 ppb
20220.611 ppb165ND - 2.19 ppb
20230.402 ppb164ND - 1.68 ppb

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
2018-03-14ND
2018-03-14ND
2018-03-14ND
2018-03-14ND
2018-06-132.21 ppb
2018-06-132.64 ppb
2018-06-131.70 ppb
2018-06-132.81 ppb
2018-09-13ND
2018-09-13ND
2018-09-131.52 ppb
2018-09-13ND
2018-12-12ND
2018-12-122.04 ppb
2018-12-12ND
2018-12-12ND
2019-03-14ND
2019-03-14ND
2019-03-14ND
2019-03-14ND
2019-06-192.44 ppb
2019-06-191.83 ppb
2019-06-19ND
2019-06-192.37 ppb
2019-09-12ND
2019-09-12ND
2019-09-122.23 ppb
2019-09-12ND
2019-12-10ND
2019-12-10ND
2019-12-10ND
2019-12-101.54 ppb
2021-03-1140889612.13 ppb
2021-03-1140889592.23 ppb
2021-03-1140889582.19 ppb
2021-03-1140889601.67 ppb
2021-06-1741307702.20 ppb
2021-06-174130771ND
2021-06-1741307682.09 ppb
2021-06-1741307692.19 ppb
2021-09-1641723721.91 ppb
2021-09-164172373ND
2021-09-1641723711.85 ppb
2021-09-164172374ND
2021-12-1542159501.58 ppb
2021-12-154215952ND
2021-12-154215951ND
2021-12-154215953ND
2022-03-094258167ND
2022-03-094258166ND
2022-03-0942581691.63 ppb
2022-03-094258168ND
2022-06-1442950301.93 ppb
2022-06-1442950292.15 ppb
2022-06-1442950282.19 ppb
2022-06-1442950311.88 ppb
2022-09-194343554ND
2022-09-194343556ND
2022-09-194343555ND
2022-09-194343557ND
2022-12-204385544ND
2022-12-204385545ND
2022-12-204385542ND
2022-12-204385543ND
2023-03-154426499ND
2023-03-154426501ND
2023-03-154426498ND
2023-03-154426500ND
2023-06-1544686421.52 ppb
2023-06-154468644ND
2023-06-154468645ND
2023-06-1544686431.68 ppb
2023-09-144514504ND
2023-09-144514506ND
2023-09-144514505ND
2023-09-144514507ND
2023-12-1445570081.55 ppb
2023-12-1445570071.68 ppb
2023-12-144557009ND
2023-12-144557010ND