1,2,4-Trichlorobenzene
Deforest Waterworks
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 | 3 | 0 | ND |
| 2019 | ND | 2 | 0 | ND |
| 2020 | ND | 4 | 0 | ND |
| 2021 | ND | 2 | 0 | ND |
| 2022 | ND | 1 | 0 | ND |
| 2023 | ND | 12 | 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 |
|---|---|---|
| 2018-03-13 | 1044928 | ND |
| 2018-03-13 | 1044929 | ND |
| 2018-08-29 | 404007001 | ND |
| 2019-06-19 | 1129331 | ND |
| 2019-06-19 | 1129330 | ND |
| 2020-06-02 | 1191108 | ND |
| 2020-06-02 | 1191109 | ND |
| 2020-06-02 | 1191107 | ND |
| 2020-06-02 | 1191092 | ND |
| 2021-04-13 | 1248611 | ND |
| 2021-04-13 | 1248610 | ND |
| 2022-07-26 | 1326226 | ND |
| 2023-03-21 | 669283001 | ND |
| 2023-03-21 | 669282001 | ND |
| 2023-06-08 | 682745001 | ND |
| 2023-06-08 | 682743001 | ND |
| 2023-07-25 | 691015001 | ND |
| 2023-07-25 | 691015002 | ND |
| 2023-09-07 | 698953003 | ND |
| 2023-09-07 | 698953001 | ND |
| 2023-09-19 | 701205001 | ND |
| 2023-09-19 | 701208001 | ND |
| 2023-12-12 | 714406001 | ND |
| 2023-12-12 | 714406002 | ND |