1,2,4-Trichlorobenzene
Mountain Regional Water Special Service District
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 | 5 | 0 | ND |
| 2019 | ND | 13 | 0 | ND |
| 2020 | ND | 8 | 0 | ND |
| 2021 | ND | 6 | 0 | ND |
| 2022 | ND | 17 | 0 | ND |
| 2023 | ND | 8 | 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 | Result |
|---|---|
| 2018-03-20 | ND |
| 2018-06-06 | ND |
| 2018-06-20 | ND |
| 2018-08-23 | ND |
| 2018-09-05 | ND |
| 2019-01-03 | ND |
| 2019-01-03 | ND |
| 2019-01-03 | ND |
| 2019-01-03 | ND |
| 2019-01-24 | ND |
| 2019-01-24 | ND |
| 2019-01-24 | ND |
| 2019-02-25 | ND |
| 2019-02-25 | ND |
| 2019-02-25 | ND |
| 2019-03-20 | ND |
| 2019-04-18 | ND |
| 2019-11-14 | ND |
| 2020-02-27 | ND |
| 2020-03-02 | ND |
| 2020-07-14 | ND |
| 2020-07-14 | ND |
| 2020-09-15 | ND |
| 2020-09-21 | ND |
| 2020-12-04 | ND |
| 2020-12-30 | ND |
| 2021-03-16 | ND |
| 2021-06-03 | ND |
| 2021-06-08 | ND |
| 2021-08-04 | ND |
| 2021-12-08 | ND |
| 2021-12-08 | ND |
| 2022-02-17 | ND |
| 2022-02-17 | ND |
| 2022-02-17 | ND |
| 2022-02-17 | ND |
| 2022-05-04 | ND |
| 2022-05-05 | ND |
| 2022-05-05 | ND |
| 2022-05-05 | ND |
| 2022-08-04 | ND |
| 2022-08-04 | ND |
| 2022-08-04 | ND |
| 2022-08-04 | ND |
| 2022-08-04 | ND |
| 2022-09-07 | ND |
| 2022-12-06 | ND |
| 2022-12-06 | ND |
| 2022-12-07 | ND |
| 2023-03-16 | ND |
| 2023-06-21 | ND |
| 2023-09-21 | ND |
| 2023-11-06 | ND |
| 2023-11-06 | ND |
| 2023-11-06 | ND |
| 2023-12-11 | ND |
| 2023-12-11 | ND |