1,2,4-Trichlorobenzene
Lacey 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 | ND | 1 | 0 | ND |
| 2019 | ND | 2 | 0 | ND |
| 2020 | N/A | 0 | 0 | N/A |
| 2021 | ND | 5 | 0 | ND |
| 2022 | ND | 9 | 0 | ND |
| 2023 | ND | 1 | 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 |
|---|---|---|
| 2018-04-26 | ND | |
| 2019-06-20 | ND | |
| 2019-11-13 | ND | |
| 2021-09-13 | 4178879 | ND |
| 2021-09-13 | 4178883 | ND |
| 2021-09-13 | 4178876 | ND |
| 2021-09-13 | 4178874 | ND |
| 2021-09-14 | 4178973 | ND |
| 2022-09-26 | 4367968 | ND |
| 2022-09-27 | 4361750 | ND |
| 2022-10-25 | 4374626 | ND |
| 2022-10-25 | 4374622 | ND |
| 2022-10-26 | 4374712 | ND |
| 2022-10-27 | 4374639 | ND |
| 2022-11-28 | 4384852 | ND |
| 2022-11-28 | 4384848 | ND |
| 2022-12-29 | 4401375 | ND |
| 2023-01-26 | 4481718 | ND |