1,2,4-Trichlorobenzene
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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 | N/A | 0 | 0 | N/A |
| 2019 | N/A | 0 | 0 | N/A |
| 2020 | ND | 3 | 0 | ND |
| 2021 | N/A | 0 | 0 | N/A |
| 2022 | 0.106 ppb | 5 | 1 | ND - 0.530 ppb |
| 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 |
|---|---|---|
| 2020-04-24 | 2004060 | ND |
| 2020-04-24 | 2004061 | ND |
| 2020-04-24 | 2004062 | ND |
| 2022-02-14 | 2121356 | 0.530 ppb |
| 2022-05-11 | 2202658 | ND |
| 2022-05-11 | 2204158 | ND |
| 2022-07-27 | 2214506 | ND |
| 2022-10-18 | 2219530 | ND |
| 2023-01-18 | 2222953 | ND |
| 2023-04-06 | 2303249 | ND |
| 2023-08-15 | 2311357 | ND |
| 2023-10-17 | 2316658 | ND |