Dichloroacetic acid
Mountain Park Public Works Authority
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 | 5.07 ppb | 4 | 2 | ND - 12.9 ppb |
| 2019 | 5.77 ppb | 4 | 3 | ND - 10.1 ppb |
| 2020 | 8.75 ppb | 4 | 3 | ND - 12.6 ppb |
| 2021 | 7.95 ppb | 4 | 4 | 7.63 ppb - 8.10 ppb |
| 2022 | 4.92 ppb | 4 | 2 | ND - 13.3 ppb |
| 2023 | 4.06 ppb | 4 | 2 | ND - 10.5 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 |
|---|---|---|
| 2018-02-19 | 2663184 | ND |
| 2018-04-21 | 1804668 | 7.36 ppb |
| 2018-07-09 | 1807275 | 12.9 ppb |
| 2018-10-01 | 1810269 | ND |
| 2019-01-07 | 1901360 | 10.1 ppb |
| 2019-04-25 | 1905099 | 5.67 ppb |
| 2019-07-17 | 1907617 | 7.32 ppb |
| 2019-10-17 | 1910612 | ND |
| 2020-01-22 | 2001618 | 10.1 ppb |
| 2020-04-14 | 100736-01 | 12.6 ppb |
| 2020-07-13 | 101849-01 | ND |
| 2020-10-13 | 103314-01 | 12.3 ppb |
| 2021-01-21 | 104617-01 | 8.01 ppb |
| 2021-04-28 | 106010-01 | 8.04 ppb |
| 2021-07-14 | 107308-01 | 7.63 ppb |
| 2021-10-21 | 108810-01 | 8.10 ppb |
| 2022-01-24 | 109996-01 | ND |
| 2022-04-25 | 111360-01 | 13.3 ppb |
| 2022-07-25 | 112649-01 | ND |
| 2022-10-13 | 113956-01 | 6.37 ppb |
| 2023-01-18 | 115228-01 | ND |
| 2023-04-11 | 116424-01 | 5.74 ppb |
| 2023-07-10 | 118060-01 | 10.5 ppb |
| 2023-10-05 | 119362-01 | ND |