Trichloroacetic acid
Hilly-greenwood Water System
Trichloroacetic 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 | 0.750 ppb | 4 | 4 | 0.610 ppb - 0.890 ppb |
| 2019 | 0.795 ppb | 4 | 4 | 0.730 ppb - 0.860 ppb |
| 2020 | 0.780 ppb | 2 | 2 | 0.700 ppb - 0.860 ppb |
| 2021 | 0.605 ppb | 2 | 2 | 0.590 ppb - 0.620 ppb |
| 2022 | 0.865 ppb | 2 | 2 | 0.730 ppb - 1.000 ppb |
| 2023 | 0.990 ppb | 2 | 2 | 0.880 ppb - 1.10 ppb |
ppb = parts per billion
State, National, and Health Guidelines for Drinking Water
EWG Health Guideline: 0.1 ppb
The EWG Health Guideline of 0.1 ppb for trichloroacetic 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 |
|---|---|---|
| 2018-06-18 | 35399876001 | 0.890 ppb |
| 2018-06-18 | 35399876002 | 0.610 ppb |
| 2018-06-18 | 35399876001 | 0.890 ppb |
| 2018-06-18 | 35399876002 | 0.610 ppb |
| 2019-06-12 | 35475533001 | 0.860 ppb |
| 2019-06-12 | 35475533002 | 0.730 ppb |
| 2019-06-12 | 35475533001 | 0.860 ppb |
| 2019-06-12 | 35475533002 | 0.730 ppb |
| 2020-06-04 | 35554848001 | 0.860 ppb |
| 2020-06-04 | 35554848002 | 0.700 ppb |
| 2021-06-28 | 35643813001 | 0.620 ppb |
| 2021-06-28 | 35643813002 | 0.590 ppb |
| 2022-06-02 | 35722429001 | 1.000 ppb |
| 2022-06-02 | 35722429002 | 0.730 ppb |
| 2023-06-14 | 35806765001 | 0.880 ppb |
| 2023-06-14 | 35806765002 | 1.10 ppb |