Trichloroacetic acid
Fort Johnson South 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 | 0.810 ppb | 4 | 4 | 0.800 ppb - 0.820 ppb |
| 2019 | 0.355 ppb | 4 | 4 | 0.280 ppb - 0.430 ppb |
| 2020 | ND | 2 | 0 | ND |
| 2021 | 0.370 ppb | 6 | 5 | ND - 0.500 ppb |
| 2022 | 0.434 ppb | 16 | 10 | ND - 1.000 ppb |
| 2023 | 0.240 ppb | 16 | 6 | ND - 0.790 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 |
|---|---|---|
| 2018-07-25 | 35407305001 | 0.800 ppb |
| 2018-07-25 | 35407305002 | 0.820 ppb |
| 2018-07-25 | 35407305001 | 0.800 ppb |
| 2018-07-25 | 35407305002 | 0.820 ppb |
| 2019-07-25 | 35485195002 | 0.280 ppb |
| 2019-07-25 | 35485195001 | 0.430 ppb |
| 2019-07-25 | 35485195002 | 0.280 ppb |
| 2019-07-25 | 35485195001 | 0.430 ppb |
| 2020-07-22 | 35565518001 | ND |
| 2020-07-22 | 35565518002 | ND |
| 2021-07-08 | 35646122001 | 0.440 ppb |
| 2021-07-08 | 35646122002 | 0.500 ppb |
| 2021-10-25 | 35673978004 | 0.380 ppb |
| 2021-10-25 | 35673978001 | 0.460 ppb |
| 2021-10-25 | 35673978002 | 0.440 ppb |
| 2021-10-25 | 35673978003 | ND |
| 2022-01-19 | 35691935001 | 0.620 ppb |
| 2022-01-19 | 35691935004 | 0.600 ppb |
| 2022-01-19 | 35691935003 | 0.560 ppb |
| 2022-01-19 | 35691935002 | 0.600 ppb |
| 2022-04-20 | 35712728004 | ND |
| 2022-04-20 | 35712728003 | ND |
| 2022-04-20 | 35712728002 | 0.400 ppb |
| 2022-04-20 | 35712728001 | 0.670 ppb |
| 2022-07-07 | 35730077004 | 0.880 ppb |
| 2022-07-07 | 35730077003 | 0.770 ppb |
| 2022-07-07 | 35730077002 | 1.000 ppb |
| 2022-07-07 | 35730077001 | 0.840 ppb |
| 2022-10-03 | 35750343001 | ND |
| 2022-10-03 | 35750343003 | ND |
| 2022-10-03 | 35750343002 | ND |
| 2022-10-03 | 35750343004 | ND |
| 2023-01-05 | 35770746003 | ND |
| 2023-01-05 | 35770746004 | ND |
| 2023-01-05 | 35770746002 | ND |
| 2023-01-05 | 35770746001 | 0.310 ppb |
| 2023-04-12 | 35792471004 | ND |
| 2023-04-12 | 35792471003 | 0.640 ppb |
| 2023-04-12 | 35792471002 | 0.790 ppb |
| 2023-04-12 | 35792471001 | 0.750 ppb |
| 2023-07-05 | 35811228001 | ND |
| 2023-07-05 | 35811228002 | ND |
| 2023-07-05 | 35811228003 | ND |
| 2023-07-05 | 35811228004 | ND |
| 2023-10-16 | 35835687001 | 0.660 ppb |
| 2023-10-16 | 35835687002 | 0.690 ppb |
| 2023-10-16 | 35835687003 | ND |
| 2023-10-16 | 35835687004 | ND |