1,2,4-Trichlorobenzene
Bristol Water Department
1,2,4-Trichlorobenzene is an industrial solvent that can harm the adrenal glands and may increase the risk of cancer.
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 | ND | 4 | 0 | ND |
| 2019 | ND | 4 | 0 | ND |
| 2020 | ND | 4 | 0 | ND |
| 2021 | ND | 4 | 0 | ND |
| 2022 | ND | 8 | 0 | ND |
| 2023 | ND | 4 | 0 | ND |
ppb = parts per billion
State, National, and Health Guidelines for Drinking Water
EWG Health Guideline: 5 ppb
The EWG Health Guideline of 5 ppb for 1,2,4-trichlorobenzene was defined by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against hormone disruption.
EPA Maximum Contaminant
Level (MCL): 70 ppb
The legal limit for 1,2,4-trichlorobenzene, established in 1992, was based on a toxicity study in laboratory animals conducted in 1981. This limit may not fully protect against hormone disruption.
ppb = parts per billion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2018-01-10 | D8A0568-04VOC | ND |
| 2018-01-10 | D8A0568-03VOC | ND |
| 2018-01-10 | D8A0568-02VOC | ND |
| 2018-01-10 | D8A0568-01VOC | ND |
| 2019-10-28 | D9J2584-01VOC | ND |
| 2019-10-28 | D9J2584-04VOC | ND |
| 2019-10-28 | D9J2584-03VOC | ND |
| 2019-10-28 | D9J2584-02VOC | ND |
| 2020-11-19 | D0K1813-01VOC | ND |
| 2020-11-19 | D0K1813-02VOC | ND |
| 2020-11-19 | D0K1813-03VOC | ND |
| 2020-11-19 | D0K1813-04VOC | ND |
| 2021-08-12 | D1H1346-03VOC | ND |
| 2021-08-12 | D1H1346-04VOC | ND |
| 2021-08-12 | D1H1346-02VOC | ND |
| 2021-08-12 | D1H1346-01VOC | ND |
| 2022-11-21 | D2K1965-01VOC | ND |
| 2022-11-21 | D2K1965-04VOC | ND |
| 2022-11-21 | D2K1965-05VOC | ND |
| 2022-11-21 | D2K1965-02VOC | ND |
| 2022-11-21 | D2K1965-03VOC | ND |
| 2022-11-21 | D2K1965-06VOC | ND |
| 2022-11-28 | D2K2374-01VOC | ND |
| 2022-11-28 | D2K2374-02VOC | ND |
| 2023-03-06 | D3C0654-01VOC | ND |
| 2023-03-06 | D3C0654-02VOC | ND |
| 2023-03-06 | D3C0654-03VOC | ND |
| 2023-03-15 | D3C1373-01VOC | ND |