Dichloroacetic acid
CTWC - Unionville System
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 | 12.1 ppb | 16 | 16 | 2.50 ppb - 18.2 ppb |
| 2019 | 8.73 ppb | 16 | 16 | 2.20 ppb - 19.5 ppb |
| 2020 | 8.14 ppb | 16 | 16 | 0.900 ppb - 15.1 ppb |
| 2021 | 8.04 ppb | 17 | 17 | 2.50 ppb - 17.8 ppb |
| 2022 | 7.58 ppb | 16 | 16 | 1.20 ppb - 20.0 ppb |
| 2023 | 9.28 ppb | 16 | 16 | 5.50 ppb - 14.0 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 |
|---|---|---|
| 2018-01-16 | BZ73287HAA5 | 13.0 ppb |
| 2018-01-16 | BZ73288HAA5 | 15.0 ppb |
| 2018-01-16 | BZ73289HAA5 | 12.0 ppb |
| 2018-01-16 | BZ73286HAA5 | 16.0 ppb |
| 2018-04-27 | CA37381HAA5 | 13.0 ppb |
| 2018-04-27 | CA37382HAA5 | 14.0 ppb |
| 2018-04-27 | CA37383HAA5 | 15.0 ppb |
| 2018-04-27 | CA37384HAA5 | 15.0 ppb |
| 2018-07-24 | CA96734 | 16.0 ppb |
| 2018-07-24 | CA96735 | 18.0 ppb |
| 2018-07-24 | CA96736 | 8.20 ppb |
| 2018-07-24 | CA96737 | 2.50 ppb |
| 2018-10-02 | DBP 200507666 | 9.10 ppb |
| 2018-10-02 | DBP 200508020 | 5.70 ppb |
| 2018-10-02 | DBP 200507667 | 3.40 ppb |
| 2018-10-02 | DBP 200507665 | 18.2 ppb |
| 2019-01-08 | DBP 200518130 | 19.5 ppb |
| 2019-01-08 | DBP 200518136 | 10.8 ppb |
| 2019-01-08 | DBP 200518139 | 13.4 ppb |
| 2019-01-08 | DBP 200518143 | 4.60 ppb |
| 2019-04-09 | DBP 200527846 | 8.00 ppb |
| 2019-04-09 | DBP 200527847 | 4.20 ppb |
| 2019-04-09 | DBP 200527848 | 15.7 ppb |
| 2019-04-09 | DBP 200527849 | 5.90 ppb |
| 2019-07-02 | DBP 200538987 | 3.70 ppb |
| 2019-07-02 | DBP 200538989 | 15.9 ppb |
| 2019-07-02 | DBP 200538988 | 6.10 ppb |
| 2019-07-02 | DBP 200538986 | 11.4 ppb |
| 2019-10-08 | DBP 200552013 | 10.00 ppb |
| 2019-10-08 | DBP 200552014 | 2.20 ppb |
| 2019-10-08 | DBP 200552015 | 2.90 ppb |
| 2019-10-08 | DBP 200552012 | 5.30 ppb |
| 2020-01-16 | DBP 200563400 | 13.0 ppb |
| 2020-01-16 | DBP 200563401 | 6.40 ppb |
| 2020-01-16 | DBP 200563402 | 6.30 ppb |
| 2020-01-16 | DBP 200563403 | 15.1 ppb |
| 2020-04-16 | DBP 200572920 | 0.900 ppb |
| 2020-04-16 | DBP 200572922 | 13.7 ppb |
| 2020-04-16 | DBP 200572918 | 14.8 ppb |
| 2020-04-16 | DBP 200572917 | 12.2 ppb |
| 2020-07-13 | DBP 200582481 | 6.20 ppb |
| 2020-07-13 | DBP 200582482 | 1.40 ppb |
| 2020-07-13 | DBP 200582483 | 12.7 ppb |
| 2020-07-14 | DBP 200582841 | 13.6 ppb |
| 2020-10-19 | DBP 200594469 | 1.80 ppb |
| 2020-10-20 | DBP 200594847 | 4.70 ppb |
| 2020-10-20 | DBP 200594848 | 2.70 ppb |
| 2020-10-20 | DBP 200594849 | 4.70 ppb |
| 2021-01-08 | DBP 200603413 | 3.60 ppb |
| 2021-01-08 | DBP 200603410 | 6.00 ppb |
| 2021-01-08 | DBP 200603411 | 5.80 ppb |
| 2021-01-08 | DBP 200603412 | 2.50 ppb |
| 2021-04-15 | DBP 200613658 | 7.80 ppb |
| 2021-04-15 | DBP 200613659 | 10.9 ppb |
| 2021-04-15 | DBP 200613660 | 14.0 ppb |
| 2021-04-15 | DBP 200613661 | 7.60 ppb |
| 2021-07-15 | DBP 200625135 | 5.20 ppb |
| 2021-07-15 | DBP 200625136 | 16.8 ppb |
| 2021-07-15 | DBP 200625137 | 6.20 ppb |
| 2021-07-15 | DBP 200625138 | 5.10 ppb |
| 2021-07-29 | DBP 200626678 | 11.3 ppb |
| 2021-10-11 | H300079421 300079427 | 17.8 ppb |
| 2021-10-11 | H300079423 300079431 | 4.00 ppb |
| 2021-10-11 | H300079422 300079429 | 4.25 ppb |
| 2021-10-11 | H300079420 300079425 | 7.80 ppb |
| 2022-01-13 | CK15522 | 7.80 ppb |
| 2022-01-13 | CK15523 | 6.90 ppb |
| 2022-01-13 | CK15524 | 20.0 ppb |
| 2022-01-13 | CK15525 | 11.0 ppb |
| 2022-04-08 | CL06148 | 7.70 ppb |
| 2022-04-08 | CL06149 | 1.60 ppb |
| 2022-04-08 | CL06150 | 1.20 ppb |
| 2022-04-08 | CL06151 | 6.70 ppb |
| 2022-07-11 | CL75327 | 5.90 ppb |
| 2022-07-11 | CL75330 | 5.80 ppb |
| 2022-07-11 | CL75328 | 4.30 ppb |
| 2022-07-11 | CL75329 | 13.0 ppb |
| 2022-10-07 | CM58820 | 6.40 ppb |
| 2022-10-07 | CM58821 | 6.00 ppb |
| 2022-10-07 | CM58822 | 9.10 ppb |
| 2022-10-07 | CM58823 | 7.90 ppb |
| 2023-01-16 | CN24479 | 12.0 ppb |
| 2023-01-16 | CN24480 | 8.00 ppb |
| 2023-01-16 | CN24481 | 11.0 ppb |
| 2023-01-16 | CN24482 | 5.50 ppb |
| 2023-04-07 | CN80791 | 6.70 ppb |
| 2023-04-07 | CN80793 | 8.50 ppb |
| 2023-04-07 | CN80792 | 14.0 ppb |
| 2023-04-07 | CN80790 | 11.0 ppb |
| 2023-07-18 | CO53034 | 7.00 ppb |
| 2023-07-18 | CO53035 | 8.60 ppb |
| 2023-07-18 | CO53036 | 13.0 ppb |
| 2023-07-18 | CO53037 | 11.0 ppb |
| 2023-10-04 | CP17811 | 6.80 ppb |
| 2023-10-04 | CP17812 | 7.10 ppb |
| 2023-10-04 | CP17813 | 11.0 ppb |
| 2023-10-04 | CP17814 | 7.20 ppb |