1,2,4-Trichlorobenzene
Columbia Water Company
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 | 1 | 0 | ND |
| 2020 | ND | 4 | 0 | ND |
| 2021 | ND | 1 | 0 | ND |
| 2022 | ND | 1 | 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 |
|---|---|---|
| 2018-04-02 | 2306480001 | ND |
| 2019-04-10 | 9042204-01 | ND |
| 2020-04-07 | 22172644.00 | ND |
| 2020-04-07 | 22172665.00 | ND |
| 2020-04-13 | 22172766.00 | ND |
| 2020-04-23 | 22173046.00 | ND |
| 2021-04-12 | 24395227.00 | ND |
| 2022-04-11 | 26608855.00 | ND |
| 2023-03-06 | 28662963.00 | ND |
| 2023-04-03 | 28859656.00 | ND |
| 2023-04-17 | 29061111.00 | ND |
| 2023-04-17 | 28859826.00 | ND |