1,2,4-Trichlorobenzene
Monona 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 | 2 | 0 | ND |
| 2019 | ND | 2 | 0 | ND |
| 2020 | ND | 1 | 0 | ND |
| 2021 | ND | 5 | 0 | ND |
| 2022 | ND | 3 | 0 | ND |
| 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 |
|---|---|---|
| 2018-07-11 | 393604001 | ND |
| 2018-09-25 | 410134001 | ND |
| 2019-04-24 | 442084001 | ND |
| 2019-09-05 | 467810001 | ND |
| 2020-07-20 | 515426001 | ND |
| 2021-02-11 | 547362001 | ND |
| 2021-02-11 | 547362002 | ND |
| 2021-02-11 | 547362001 | ND |
| 2021-02-11 | 547362002 | ND |
| 2021-09-17 | 584334001 | ND |
| 2022-03-22 | 610616001 | ND |
| 2022-03-23 | 610869001 | ND |
| 2022-09-13 | 642092001 | ND |
| 2023-03-17 | 668942001 | ND |
| 2023-03-21 | 669257001 | ND |
| 2023-03-21 | 669257002 | ND |
| 2023-07-11 | 687958001 | ND |