1,2,4-Trichlorobenzene
City of Lewiston
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 | 4 | 0 | ND |
| 2019 | ND | 4 | 0 | ND |
| 2020 | ND | 6 | 0 | ND |
| 2021 | ND | 5 | 0 | ND |
| 2022 | ND | 3 | 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 |
|---|---|---|
| 2018-02-21 | V180221045-001 | ND |
| 2018-02-22 | V180223004-001 | ND |
| 2018-12-13 | V181213011-001 | ND |
| 2018-12-13 | V181213011-002 | ND |
| 2019-01-24 | V190124017-001 | ND |
| 2019-04-23 | V190423067-001 | ND |
| 2019-04-23 | V190423067-002 | ND |
| 2019-08-14 | V190814075-003 | ND |
| 2020-02-19 | V200219035-001 | ND |
| 2020-07-28 | VMAG0811-07 | ND |
| 2020-07-28 | VMAG0811-08 | ND |
| 2020-07-28 | VMAG0811-05 | ND |
| 2020-07-28 | VMAG0811-03 | ND |
| 2020-07-28 | VMAG0811-01 | ND |
| 2021-06-29 | VMBF0852-06 | ND |
| 2021-06-29 | VMBF0852-03 | ND |
| 2021-06-29 | VMBF0852-01 | ND |
| 2021-06-29 | VMBG0852-04 | ND |
| 2021-06-29 | VMBF0852-07 | ND |
| 2022-06-28 | VMCF0954-01 | ND |
| 2022-09-21 | VMCI0682-01 | ND |
| 2022-11-21 | VMCK0693-01 | ND |
| 2023-01-01 | VMDA0450-01 | ND |
| 2023-08-02 | VMDH0130-01 | ND |