1,2,4-Trichlorobenzene
Redmond Water Department
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 | N/A | 0 | 0 | N/A |
| 2021 | ND | 8 | 0 | ND |
| 2022 | N/A | 0 | 0 | N/A |
| 2023 | ND | 8 | 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 |
|---|---|---|
| 2021-05-11 | 2132295-V | ND |
| 2021-05-11 | 2132299-V | ND |
| 2021-05-11 | 2132264-V | ND |
| 2021-05-18 | 2133712-V | ND |
| 2021-05-18 | 2133715-V | ND |
| 2021-05-18 | 2133726-V | ND |
| 2021-06-02 | 2137357-V | ND |
| 2021-06-02 | 2137359-V | ND |
| 2023-07-13 | 23-40882-V | ND |
| 2023-07-13 | 23-40886-V | ND |
| 2023-07-13 | 23-40883-V | ND |
| 2023-07-13 | 23-40863-V | ND |
| 2023-07-13 | 23-40885-V | ND |
| 2023-07-13 | 23-40887-V | ND |
| 2023-07-13 | 23-40884-V | ND |
| 2023-07-17 | 23-41527-V | ND |