Dichloroacetic acid
St Charles Water District 1 East Bank
Dichloroacetic 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.
Samples
Samples exceeding legal limit (MCL)
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2018 | 18.9 ppb | 32 | 32 | 12.3 ppb - 22.9 ppb |
| 2019 | 21.6 ppb | 64 | 64 | 11.1 ppb - 37.7 ppb |
| 2020 | 20.9 ppb | 32 | 32 | 11.8 ppb - 33.7 ppb |
| 2021 | 19.7 ppb | 32 | 32 | 9.00 ppb - 34.1 ppb |
| 2022 | 18.9 ppb | 32 | 32 | 9.90 ppb - 31.6 ppb |
| 2023 | 18.2 ppb | 32 | 32 | 7.90 ppb - 32.7 ppb |
ppb = parts per billion
State, National, and Health Guidelines for Drinking Water
EWG Health Guideline: 0.2 ppb
The EWG Health Guideline of 0.2 ppb for dichloroacetic 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. This health guideline protects against cancer and harm to reproduction and child development.
ppb = parts per billion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2018-03-13 | 35380152001 | 21.6 ppb |
| 2018-03-13 | 35380152002 | 21.2 ppb |
| 2018-03-13 | 35380152003 | 13.6 ppb |
| 2018-03-13 | 35380152004 | 18.5 ppb |
| 2018-03-13 | 35380152001 | 21.6 ppb |
| 2018-03-13 | 35380152002 | 21.2 ppb |
| 2018-03-13 | 35380152003 | 13.6 ppb |
| 2018-03-13 | 35380152004 | 18.5 ppb |
| 2018-06-12 | 35398121001 | 22.9 ppb |
| 2018-06-12 | 35398121002 | 22.0 ppb |
| 2018-06-12 | 35398121003 | 21.9 ppb |
| 2018-06-12 | 35398121004 | 22.2 ppb |
| 2018-06-12 | 35398121001 | 22.9 ppb |
| 2018-06-12 | 35398121002 | 22.0 ppb |
| 2018-06-12 | 35398121003 | 21.9 ppb |
| 2018-06-12 | 35398121004 | 22.2 ppb |
| 2018-09-20 | 35419460001 | 22.7 ppb |
| 2018-09-20 | 35419460002 | 20.1 ppb |
| 2018-09-20 | 35419460003 | 20.7 ppb |
| 2018-09-20 | 35419460004 | 21.5 ppb |
| 2018-09-20 | 35419460001 | 22.7 ppb |
| 2018-09-20 | 35419460002 | 20.1 ppb |
| 2018-09-20 | 35419460003 | 20.7 ppb |
| 2018-09-20 | 35419460004 | 21.5 ppb |
| 2018-12-13 | 35437252001 | 13.0 ppb |
| 2018-12-13 | 35437252002 | 12.5 ppb |
| 2018-12-13 | 35437252003 | 12.3 ppb |
| 2018-12-13 | 35437252004 | 15.2 ppb |
| 2018-12-13 | 35437252001 | 13.0 ppb |
| 2018-12-13 | 35437252002 | 12.5 ppb |
| 2018-12-13 | 35437252003 | 12.3 ppb |
| 2018-12-13 | 35437252004 | 15.2 ppb |
| 2019-03-14 | 35454705001 | 17.5 ppb |
| 2019-03-14 | 35454705002 | 20.1 ppb |
| 2019-03-14 | 35454705003 | 12.6 ppb |
| 2019-03-14 | 35454705004 | 11.1 ppb |
| 2019-03-14 | 35454705001 | 17.5 ppb |
| 2019-03-14 | 35454705002 | 20.1 ppb |
| 2019-03-14 | 35454705003 | 12.6 ppb |
| 2019-03-14 | 35454705004 | 11.1 ppb |
| 2019-06-12 | 35475693001 | 37.7 ppb |
| 2019-06-12 | 35475693002 | 32.9 ppb |
| 2019-06-12 | 35475693003 | 26.5 ppb |
| 2019-06-12 | 35475693004 | 33.4 ppb |
| 2019-06-12 | 35475693001 | 37.7 ppb |
| 2019-06-12 | 35475693002 | 32.9 ppb |
| 2019-06-12 | 35475693003 | 26.5 ppb |
| 2019-06-12 | 35475693004 | 33.4 ppb |
| 2019-09-05 | 35495203001 | 28.0 ppb |
| 2019-09-05 | 35495203002 | 24.3 ppb |
| 2019-09-05 | 35495203003 | 27.2 ppb |
| 2019-09-05 | 35495203004 | 27.6 ppb |
| 2019-09-05 | 35495203005 | 23.4 ppb |
| 2019-09-05 | 35495203006 | 22.3 ppb |
| 2019-09-05 | 35495203007 | 29.0 ppb |
| 2019-09-05 | 35495203008 | 23.4 ppb |
| 2019-09-05 | 35495203001 | 28.0 ppb |
| 2019-09-05 | 35495203002 | 24.3 ppb |
| 2019-09-05 | 35495203003 | 27.2 ppb |
| 2019-09-05 | 35495203004 | 27.6 ppb |
| 2019-09-05 | 35495203005 | 23.4 ppb |
| 2019-09-05 | 35495203006 | 22.3 ppb |
| 2019-09-05 | 35495203007 | 29.0 ppb |
| 2019-09-05 | 35495203008 | 23.4 ppb |
| 2019-10-10 | 35504423001 | 22.9 ppb |
| 2019-10-10 | 35504423002 | 21.5 ppb |
| 2019-10-10 | 35504423003 | 20.8 ppb |
| 2019-10-10 | 35504423004 | 21.9 ppb |
| 2019-10-10 | 35504423005 | 19.4 ppb |
| 2019-10-10 | 35504423006 | 17.1 ppb |
| 2019-10-10 | 35504423007 | 17.9 ppb |
| 2019-10-10 | 35504423008 | 21.1 ppb |
| 2019-10-10 | 35504423001 | 22.9 ppb |
| 2019-10-10 | 35504423002 | 21.5 ppb |
| 2019-10-10 | 35504423003 | 20.8 ppb |
| 2019-10-10 | 35504423004 | 21.9 ppb |
| 2019-10-10 | 35504423005 | 19.4 ppb |
| 2019-10-10 | 35504423006 | 17.1 ppb |
| 2019-10-10 | 35504423007 | 17.9 ppb |
| 2019-10-10 | 35504423008 | 21.1 ppb |
| 2019-12-10 | 35518126001 | 18.4 ppb |
| 2019-12-10 | 35518126002 | 19.3 ppb |
| 2019-12-10 | 35518126003 | 19.1 ppb |
| 2019-12-10 | 35518126004 | 14.1 ppb |
| 2019-12-10 | 35518126005 | 15.4 ppb |
| 2019-12-10 | 35518126006 | 14.3 ppb |
| 2019-12-10 | 35518126007 | 13.6 ppb |
| 2019-12-10 | 35518126008 | 16.5 ppb |
| 2019-12-10 | 35518126001 | 18.4 ppb |
| 2019-12-10 | 35518126002 | 19.3 ppb |
| 2019-12-10 | 35518126003 | 19.1 ppb |
| 2019-12-10 | 35518126004 | 14.1 ppb |
| 2019-12-10 | 35518126005 | 15.4 ppb |
| 2019-12-10 | 35518126006 | 14.3 ppb |
| 2019-12-10 | 35518126007 | 13.6 ppb |
| 2019-12-10 | 35518126008 | 16.5 ppb |
| 2020-03-05 | 35535524001 | 16.6 ppb |
| 2020-03-05 | 35535524002 | 16.2 ppb |
| 2020-03-05 | 35535524003 | 15.4 ppb |
| 2020-03-05 | 35535524004 | 12.4 ppb |
| 2020-03-05 | 35535524005 | 12.6 ppb |
| 2020-03-05 | 35535524006 | 11.8 ppb |
| 2020-03-05 | 35535524007 | 12.0 ppb |
| 2020-03-05 | 35535524008 | 14.2 ppb |
| 2020-06-18 | 35557773001 | 33.7 ppb |
| 2020-06-18 | 35557773002 | 32.3 ppb |
| 2020-06-18 | 35557773003 | 33.6 ppb |
| 2020-06-18 | 35557773004 | 29.9 ppb |
| 2020-06-18 | 35557773005 | 30.7 ppb |
| 2020-06-18 | 35557773006 | 28.3 ppb |
| 2020-06-18 | 35557773007 | 29.1 ppb |
| 2020-06-18 | 35557773008 | 24.1 ppb |
| 2020-09-18 | 35579010001 | 23.6 ppb |
| 2020-09-18 | 35579010002 | 22.4 ppb |
| 2020-09-18 | 35579010003 | 23.2 ppb |
| 2020-09-18 | 35579010004 | 22.9 ppb |
| 2020-09-18 | 35579010005 | 22.6 ppb |
| 2020-09-18 | 35579010006 | 22.8 ppb |
| 2020-09-18 | 35579010007 | 21.5 ppb |
| 2020-09-18 | 35579010008 | 21.1 ppb |
| 2020-12-11 | 35598546001 | 19.4 ppb |
| 2020-12-11 | 35598546002 | 18.5 ppb |
| 2020-12-11 | 35598546003 | 18.1 ppb |
| 2020-12-11 | 35598546004 | 15.8 ppb |
| 2020-12-11 | 35598546005 | 16.8 ppb |
| 2020-12-11 | 35598546006 | 16.3 ppb |
| 2020-12-11 | 35598546007 | 15.7 ppb |
| 2020-12-11 | 35598546008 | 15.8 ppb |
| 2021-03-11 | 35618677001 | 16.5 ppb |
| 2021-03-11 | 35618677002 | 15.0 ppb |
| 2021-03-11 | 35618677003 | 15.2 ppb |
| 2021-03-11 | 35618677004 | 12.5 ppb |
| 2021-03-11 | 35618677005 | 13.6 ppb |
| 2021-03-11 | 35618677006 | 12.7 ppb |
| 2021-03-11 | 35618677007 | 12.2 ppb |
| 2021-03-11 | 35618677008 | 13.7 ppb |
| 2021-06-09 | 35639743001 | 34.1 ppb |
| 2021-06-09 | 35639743002 | 33.3 ppb |
| 2021-06-09 | 35639743003 | 32.2 ppb |
| 2021-06-09 | 35639743004 | 29.9 ppb |
| 2021-06-09 | 35639743005 | 30.3 ppb |
| 2021-06-09 | 35639743006 | 27.7 ppb |
| 2021-06-09 | 35639743007 | 27.8 ppb |
| 2021-06-09 | 35639743008 | 28.4 ppb |
| 2021-09-22 | 35666065001 | 23.5 ppb |
| 2021-09-22 | 35666065002 | 23.2 ppb |
| 2021-09-22 | 35666065003 | 24.4 ppb |
| 2021-09-22 | 35666065004 | 23.2 ppb |
| 2021-09-22 | 35666065005 | 26.6 ppb |
| 2021-09-22 | 35666065006 | 26.1 ppb |
| 2021-09-22 | 35666065007 | 20.8 ppb |
| 2021-09-22 | 35666065008 | 25.3 ppb |
| 2021-12-21 | 35685949001 | 11.9 ppb |
| 2021-12-21 | 35685949002 | 11.5 ppb |
| 2021-12-21 | 35685949003 | 12.0 ppb |
| 2021-12-21 | 35685949004 | 9.30 ppb |
| 2021-12-21 | 35685949005 | 9.00 ppb |
| 2021-12-21 | 35685949006 | 9.00 ppb |
| 2021-12-21 | 35685949007 | 9.60 ppb |
| 2021-12-21 | 35685949008 | 9.10 ppb |
| 2022-03-02 | 35701560001 | 17.2 ppb |
| 2022-03-02 | 35701560002 | 16.8 ppb |
| 2022-03-02 | 35701560003 | 16.6 ppb |
| 2022-03-02 | 35701560004 | 14.5 ppb |
| 2022-03-02 | 35701560005 | 14.2 ppb |
| 2022-03-02 | 35701560006 | 14.4 ppb |
| 2022-03-02 | 35701560007 | 14.3 ppb |
| 2022-03-02 | 35701560008 | 15.1 ppb |
| 2022-06-09 | B2202697-001 | 31.0 ppb |
| 2022-06-09 | B2202697-002 | 31.6 ppb |
| 2022-06-09 | B2202697-003 | 30.9 ppb |
| 2022-06-09 | B2202697-004 | 29.1 ppb |
| 2022-06-09 | B2202697-005 | 30.4 ppb |
| 2022-06-09 | B2202697-006 | 30.0 ppb |
| 2022-06-09 | B2202697-007 | 28.3 ppb |
| 2022-06-09 | B2202697-008 | 31.5 ppb |
| 2022-09-15 | 35747218001 | 20.0 ppb |
| 2022-09-15 | 35747218002 | 19.7 ppb |
| 2022-09-15 | 35747218003 | 21.2 ppb |
| 2022-09-15 | 35747218004 | 17.9 ppb |
| 2022-09-15 | 35747218005 | 17.5 ppb |
| 2022-09-15 | 35747218006 | 18.8 ppb |
| 2022-09-15 | 35747218007 | 18.9 ppb |
| 2022-09-15 | 35747218008 | 18.5 ppb |
| 2022-12-15 | 35767203001 | 12.7 ppb |
| 2022-12-15 | 35767203002 | 10.9 ppb |
| 2022-12-15 | 35767203003 | 11.3 ppb |
| 2022-12-15 | 35767203004 | 10.00 ppb |
| 2022-12-15 | 35767203005 | 10.5 ppb |
| 2022-12-15 | 35767203006 | 9.90 ppb |
| 2022-12-15 | 35767203007 | 10.2 ppb |
| 2022-12-15 | 35767203008 | 11.5 ppb |
| 2023-03-14 | 35785900001 | 18.0 ppb |
| 2023-03-14 | 35785900002 | 17.6 ppb |
| 2023-03-14 | 35785900003 | 18.6 ppb |
| 2023-03-14 | 35785900004 | 16.7 ppb |
| 2023-03-14 | 35785900005 | 16.8 ppb |
| 2023-03-14 | 35785900006 | 16.0 ppb |
| 2023-03-14 | 35785900007 | 15.9 ppb |
| 2023-03-14 | 35785900008 | 16.5 ppb |
| 2023-06-09 | 35805553001 | 27.0 ppb |
| 2023-06-09 | 35805553002 | 24.0 ppb |
| 2023-06-09 | 35805553003 | 32.7 ppb |
| 2023-06-09 | 35805553004 | 30.6 ppb |
| 2023-06-09 | 35805553005 | 31.1 ppb |
| 2023-06-09 | 35805553006 | 28.8 ppb |
| 2023-06-09 | 35805553007 | 26.9 ppb |
| 2023-06-09 | 35805553008 | 27.7 ppb |
| 2023-09-06 | 35826117001 | 19.4 ppb |
| 2023-09-06 | 35826117002 | 20.0 ppb |
| 2023-09-06 | 35826117003 | 18.2 ppb |
| 2023-09-06 | 35826117004 | 17.1 ppb |
| 2023-09-06 | 35826117005 | 17.5 ppb |
| 2023-09-06 | 35826117006 | 17.2 ppb |
| 2023-09-06 | 35826117007 | 16.8 ppb |
| 2023-09-06 | 35826117008 | 18.0 ppb |
| 2023-12-19 | 35849365001 | 8.70 ppb |
| 2023-12-19 | 35849365002 | 8.50 ppb |
| 2023-12-19 | 35849365003 | 9.40 ppb |
| 2023-12-19 | 35849365004 | 7.90 ppb |
| 2023-12-19 | 35849365006 | 9.80 ppb |
| 2023-12-19 | 35849365007 | 8.70 ppb |
| 2023-12-19 | 35849365008 | 10.2 ppb |
| 2023-12-19 | 35849991001 | 10.4 ppb |