1,2,4-Trichlorobenzene
El Dorado Utility 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 | 2 | 0 | ND |
| 2019 | ND | 2 | 0 | ND |
| 2020 | ND | 2 | 0 | ND |
| 2021 | ND | 3 | 0 | ND |
| 2022 | ND | 4 | 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 |
|---|---|---|
| 2018-05-23 | AE27472 | ND |
| 2018-05-23 | AE27494 | ND |
| 2019-11-07 | AE88917 | ND |
| 2019-11-07 | AE88949 | ND |
| 2020-09-03 | AF26496 | ND |
| 2020-09-03 | AF26498 | ND |
| 2021-07-28 | AF63797 | ND |
| 2021-07-28 | AF63803 | ND |
| 2021-11-01 | AF75259 | ND |
| 2022-03-25 | AF90742 | ND |
| 2022-03-25 | AF90744 | ND |
| 2022-05-23 | AF98024 | ND |
| 2022-08-23 | AG10530 | ND |
| 2023-06-29 | AG46796 | ND |
| 2023-06-29 | AG46798 | ND |