Dichloroacetic acid
University of Connecticut - Main Campus
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 | 1.000 ppb | 24 | 13 | ND - 3.80 ppb |
| 2019 | 1.20 ppb | 24 | 15 | ND - 3.50 ppb |
| 2020 | 1.45 ppb | 22 | 13 | ND - 5.00 ppb |
| 2021 | 2.32 ppb | 16 | 14 | ND - 6.70 ppb |
| 2022 | 2.31 ppb | 16 | 13 | ND - 5.80 ppb |
| 2023 | 1.75 ppb | 16 | 10 | ND - 7.90 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 |
|---|---|---|
| 2018-03-15 | CA02987HAA5 | 3.80 ppb |
| 2018-03-15 | CA02988HAA5 | 1.70 ppb |
| 2018-03-15 | CA02989HAA5 | 2.10 ppb |
| 2018-03-15 | CA02990HAA5 | ND |
| 2018-06-12 | CA68568HAA5 | 1.90 ppb |
| 2018-06-12 | CA68569HAA5 | 3.60 ppb |
| 2018-06-12 | CA68570HAA5 | 1.10 ppb |
| 2018-06-12 | CA68571HAA5 | ND |
| 2018-09-19 | DBP 200506182 | 0.900 ppb |
| 2018-09-19 | DBP 200506184 | ND |
| 2018-09-19 | DBP 200506186 | ND |
| 2018-09-19 | DBP 200506189 | 0.600 ppb |
| 2018-09-25 | DBP 200506720 | 1.000 ppb |
| 2018-09-25 | DBP 200506721 | ND |
| 2018-09-25 | DBP 200506722 | ND |
| 2018-09-25 | DBP 200506723 | 0.800 ppb |
| 2018-09-26 | DBP 200506966 | ND |
| 2018-09-27 | DBP 200507073 | ND |
| 2018-12-04 | DBP 200514724 | 1.30 ppb |
| 2018-12-04 | DBP 200514725 | ND |
| 2018-12-04 | DBP 200514726 | ND |
| 2018-12-04 | DBP 200514728 | 2.90 ppb |
| 2018-12-17 | DBP 200516281 | 2.30 ppb |
| 2018-12-17 | DBP 200516282 | ND |
| 2019-03-18 | DBP 200525024 | 2.30 ppb |
| 2019-03-18 | DBP 200525026 | 2.90 ppb |
| 2019-03-18 | DBP 200525029 | 1.80 ppb |
| 2019-03-18 | DBP 200525031 | ND |
| 2019-03-18 | DBP 200525033 | 2.40 ppb |
| 2019-03-18 | DBP 200525034 | ND |
| 2019-06-24 | DBP 200537541 | ND |
| 2019-06-24 | DBP 200537542 | 0.900 ppb |
| 2019-06-24 | DBP 200537543 | ND |
| 2019-06-25 | DBP 200537806 | 2.30 ppb |
| 2019-06-25 | DBP 200537807 | 3.50 ppb |
| 2019-06-25 | DBP 200537808 | ND |
| 2019-09-16 | DBP 200549001 | 1.20 ppb |
| 2019-09-16 | DBP 200549002 | 0.800 ppb |
| 2019-09-16 | DBP 200549040 | 0.800 ppb |
| 2019-09-16 | DBP 200549041 | ND |
| 2019-09-16 | DBP 200549043 | 0.600 ppb |
| 2019-09-16 | DBP 200549044 | ND |
| 2019-12-09 | DBP 200559412 | 2.50 ppb |
| 2019-12-09 | DBP 200559416 | 1.80 ppb |
| 2019-12-09 | DBP 200559419 | ND |
| 2019-12-09 | DBP 200559422 | 2.70 ppb |
| 2019-12-09 | DBP 200559425 | 2.20 ppb |
| 2019-12-09 | DBP 200559427 | ND |
| 2020-03-10 | DBP 200568861 | 4.20 ppb |
| 2020-03-10 | DBP 200568862 | 3.70 ppb |
| 2020-03-10 | DBP 200568863 | 1.10 ppb |
| 2020-03-10 | DBP 200568864 | ND |
| 2020-03-10 | DBP 200568865 | 2.90 ppb |
| 2020-03-10 | DBP 200568866 | 0.800 ppb |
| 2020-06-08 | DBP 200578348 | 5.00 ppb |
| 2020-06-08 | DBP 200578349 | 4.60 ppb |
| 2020-06-08 | DBP 200578350 | 0.700 ppb |
| 2020-06-08 | DBP 200578351 | ND |
| 2020-06-08 | DBP 200578352 | ND |
| 2020-06-08 | DBP 200578353 | ND |
| 2020-09-08 | DBP 200589310 | 1.10 ppb |
| 2020-09-08 | DBP 200589311 | 1.40 ppb |
| 2020-09-08 | DBP 200589312 | ND |
| 2020-09-08 | DBP 200589313 | ND |
| 2020-09-08 | DBP 200589314 | ND |
| 2020-09-08 | DBP 200589315 | ND |
| 2020-12-14 | DBP 200601156 | 2.40 ppb |
| 2020-12-14 | DBP 200601157 | 1.60 ppb |
| 2020-12-14 | DBP 200601385 | ND |
| 2020-12-15 | DBP 200601475 | 2.40 ppb |
| 2021-03-10 | DBP 200609379 | 3.40 ppb |
| 2021-03-10 | DBP 200609380 | 2.10 ppb |
| 2021-03-10 | DBP 200609381 | 3.30 ppb |
| 2021-03-10 | DBP 200609382 | 1.20 ppb |
| 2021-06-01 | DBP 200619042 | 5.60 ppb |
| 2021-06-01 | DBP 200619044 | 0.600 ppb |
| 2021-06-01 | DBP 200619046 | 2.40 ppb |
| 2021-06-01 | DBP 200619048 | ND |
| 2021-09-08 | 300054204 300054208 | 1.79 ppb |
| 2021-09-08 | 300054205 300054210 | 1.36 ppb |
| 2021-09-08 | 300054206 300054212 | 1.19 ppb |
| 2021-09-08 | 300054207 300054214 | 0.520 ppb |
| 2021-12-07 | D300114234 300114238 | 6.50 ppb |
| 2021-12-07 | D300114235 300114240 | 0.500 ppb |
| 2021-12-07 | D300114236 300114242 | 6.70 ppb |
| 2021-12-07 | D300114237 300114244 | ND |
| 2022-03-07 | CK80432 | 5.40 ppb |
| 2022-03-07 | CK80433 | ND |
| 2022-03-07 | CK80434 | 5.80 ppb |
| 2022-03-07 | CK80435 | 2.60 ppb |
| 2022-06-02 | CL46810 | 3.50 ppb |
| 2022-06-02 | CL46811 | ND |
| 2022-06-02 | CL46812 | 5.20 ppb |
| 2022-06-02 | CL46813 | 1.10 ppb |
| 2022-09-12 | CM28524 | 2.10 ppb |
| 2022-09-12 | CM28525 | ND |
| 2022-09-12 | CM28526 | 1.80 ppb |
| 2022-09-12 | CM28527 | 1.10 ppb |
| 2022-12-12 | CN02522 | 2.70 ppb |
| 2022-12-12 | CN02523 | 1.10 ppb |
| 2022-12-12 | CN02524 | 3.50 ppb |
| 2022-12-12 | CN02525 | 1.000 ppb |
| 2023-03-08 | CN55281 | 3.30 ppb |
| 2023-03-08 | CN55282 | ND |
| 2023-03-08 | CN55283 | 3.10 ppb |
| 2023-03-08 | CN55284 | ND |
| 2023-06-05 | CO19179 | 7.90 ppb |
| 2023-06-05 | CO19180 | ND |
| 2023-06-05 | CO19181 | 2.40 ppb |
| 2023-06-05 | CO19182 | 1.60 ppb |
| 2023-09-11 | CO94210 | 2.20 ppb |
| 2023-09-11 | CO94211 | ND |
| 2023-09-11 | CO94212 | 1.40 ppb |
| 2023-09-11 | CO94213 | 1.20 ppb |
| 2023-12-05 | CP59865 | 2.40 ppb |
| 2023-12-05 | CP59866 | ND |
| 2023-12-05 | CP59867 | 2.50 ppb |
| 2023-12-05 | CP59868 | ND |