1,2,4-Trichlorobenzene
Danbury 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 | 2 | 0 | ND |
| 2019 | ND | 2 | 0 | ND |
| 2020 | ND | 3 | 0 | ND |
| 2021 | ND | 2 | 0 | ND |
| 2022 | ND | 2 | 0 | ND |
| 2023 | ND | 2 | 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 |
|---|---|---|
| 2018-02-21 | 210745GE | ND |
| 2018-02-21 | 210744GE | ND |
| 2019-08-15 | VOC1 200545121 | ND |
| 2019-08-15 | VOC1 200545122 | ND |
| 2020-02-20 | VOC1 200566893 | ND |
| 2020-02-20 | VOC1 200566892 | ND |
| 2020-02-21 | VOC1 200566982 | ND |
| 2021-01-21 | VOC1 200604571 | ND |
| 2021-01-21 | VOC1 200604570 | ND |
| 2022-01-20 | 279326 | ND |
| 2022-01-20 | 279325 | ND |
| 2023-02-09 | 306232 | ND |
| 2023-02-09 | 306231 | ND |