1,2,4-Trichlorobenzene
Paw Blue Mountain Division
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 | 1 | 0 | ND |
| 2019 | ND | 2 | 0 | ND |
| 2020 | ND | 5 | 0 | ND |
| 2021 | ND | 4 | 0 | ND |
| 2022 | ND | 4 | 0 | ND |
| 2023 | ND | 5 | 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 | 38160101 | ND |
| 2019-01-09 | 42498201 | ND |
| 2019-07-16 | 45238801 | ND |
| 2020-04-22 | 22086236.00 | ND |
| 2020-04-29 | 22086545.00 | ND |
| 2020-04-29 | 22086566.00 | ND |
| 2020-05-11 | 22278289.00 | ND |
| 2020-05-11 | 22278310.00 | ND |
| 2021-04-12 | 24308435.00 | ND |
| 2021-04-12 | 24308456.00 | ND |
| 2021-07-21 | 24889771.00 | ND |
| 2021-07-21 | 24889792.00 | ND |
| 2022-04-18 | 26522963.00 | ND |
| 2022-04-18 | 26522984.00 | ND |
| 2022-08-03 | 27300360.00 | ND |
| 2022-08-04 | 27300341.00 | ND |
| 2023-04-10 | 28766752.00 | ND |
| 2023-04-10 | 28766733.00 | ND |
| 2023-04-11 | 28766708.00 | ND |
| 2023-04-11 | 28766702.00 | ND |
| 2023-06-07 | 29172443.00 | ND |