Know Your Environment. Protect Your Health.

Monochloroacetic acid

St John Water District 1

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.

 

128

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.638 ppb324ND - 6.40 ppb
20192.19 ppb3218ND - 8.30 ppb
20200.994 ppb169ND - 2.90 ppb
20211.02 ppb1611ND - 2.00 ppb
20221.23 ppb1612ND - 2.50 ppb
20231.16 ppb1610ND - 2.80 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
2018-03-1535380540001ND
2018-03-1535380540002ND
2018-03-1535380540003ND
2018-03-1535380540004ND
2018-03-1535380540001ND
2018-03-1535380540002ND
2018-03-1535380540003ND
2018-03-1535380540004ND
2018-06-1435398652001ND
2018-06-14353986520026.40 ppb
2018-06-1435398652003ND
2018-06-14353986520043.80 ppb
2018-06-1435398652001ND
2018-06-14353986520026.40 ppb
2018-06-1435398652003ND
2018-06-14353986520043.80 ppb
2018-09-0635416143001ND
2018-09-0635416143002ND
2018-09-0635416143003ND
2018-09-0635416143004ND
2018-09-0635416143001ND
2018-09-0635416143002ND
2018-09-0635416143003ND
2018-09-0635416143004ND
2018-12-1035436357001ND
2018-12-1035436357002ND
2018-12-1035436357003ND
2018-12-1035436357004ND
2018-12-1035436357001ND
2018-12-1035436357002ND
2018-12-1035436357003ND
2018-12-1035436357004ND
2019-03-13354545570011.50 ppb
2019-03-1335454557002ND
2019-03-13354545570031.40 ppb
2019-03-1335454557004ND
2019-03-13354545570011.50 ppb
2019-03-1335454557002ND
2019-03-13354545570031.40 ppb
2019-03-1335454557004ND
2019-06-1135475288001ND
2019-06-1135475288002ND
2019-06-1135475288003ND
2019-06-1135475288004ND
2019-06-1135475288001ND
2019-06-1135475288002ND
2019-06-1135475288003ND
2019-06-1135475288004ND
2019-09-12354975890018.30 ppb
2019-09-12354975890026.40 ppb
2019-09-12354975890035.50 ppb
2019-09-12354975890048.00 ppb
2019-09-12354975890018.30 ppb
2019-09-12354975890026.40 ppb
2019-09-12354975890035.50 ppb
2019-09-12354975890048.00 ppb
2019-12-09355175910011.30 ppb
2019-12-09355175910021.40 ppb
2019-12-09355175910031.20 ppb
2019-12-0935517591004ND
2019-12-09355175910011.30 ppb
2019-12-09355175910021.40 ppb
2019-12-09355175910031.20 ppb
2019-12-0935517591004ND
2020-03-1135537039001ND
2020-03-1135537039002ND
2020-03-1135537039003ND
2020-03-1135537039004ND
2020-06-11355562500012.90 ppb
2020-06-11355562500021.80 ppb
2020-06-11355562500031.70 ppb
2020-06-11355562500042.10 ppb
2020-09-0335575675001ND
2020-09-0335575675002ND
2020-09-0335575675003ND
2020-09-03355756750041.70 ppb
2020-12-10355983180011.40 ppb
2020-12-10355983180021.30 ppb
2020-12-10355983180031.40 ppb
2020-12-10355983180041.60 ppb
2021-03-1835620545001ND
2021-03-1935620545002ND
2021-03-1935620545003ND
2021-03-1935620545004ND
2021-06-30356444690011.80 ppb
2021-06-30356444690021.70 ppb
2021-06-30356444690032.00 ppb
2021-06-30356444690041.70 ppb
2021-09-24356671050011.90 ppb
2021-09-24356671050021.40 ppb
2021-09-24356671050031.50 ppb
2021-09-2435667105004ND
2021-12-21356863050010.910 ppb
2021-12-21356863050021.000 ppb
2021-12-21356863050031.000 ppb
2021-12-21356863050041.40 ppb
2022-03-1035702953001ND
2022-03-1035702953002ND
2022-03-1035702953003ND
2022-03-1035702953004ND
2022-07-25357342720011.20 ppb
2022-07-25357342720021.60 ppb
2022-07-25357342720031.50 ppb
2022-07-25357342720042.50 ppb
2022-09-07357450590011.80 ppb
2022-09-07357450590021.60 ppb
2022-09-07357450590031.90 ppb
2022-09-07357450590041.30 ppb
2022-12-01357634240011.50 ppb
2022-12-01357634240021.50 ppb
2022-12-01357634240031.60 ppb
2022-12-01357634240041.70 ppb
2023-03-1635786614001ND
2023-03-16357866140021.60 ppb
2023-03-16357866140031.60 ppb
2023-03-1635786614004ND
2023-06-21358083690011.90 ppb
2023-06-21358083690021.40 ppb
2023-06-21358083690032.10 ppb
2023-06-21358083690042.80 ppb
2023-09-1835828418001ND
2023-09-1835828418002ND
2023-09-1835828418003ND
2023-09-1835828418004ND
2023-12-27358505920011.90 ppb
2023-12-27358505920021.30 ppb
2023-12-27358505920032.00 ppb
2023-12-27358505920041.90 ppb