1,2,4-Trichlorobenzene
St. Nersess Armenian Seminary
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 | ND | 5 | 0 | ND |
| 2021 | ND | 2 | 0 | ND |
| 2022 | ND | 3 | 0 | ND |
| 2023 | ND | 6 | 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 |
|---|---|---|
| 2020-03-17 | AW05461-POCS | ND |
| 2020-07-15 | AW13403-POCS | ND |
| 2020-07-15 | AW13401-POCS | ND |
| 2020-11-04 | 4201846171-POCS | ND |
| 2020-11-04 | 4201846173-POCS | ND |
| 2021-03-02 | AX04088-POCS | ND |
| 2021-07-21 | AX14494-POCS | ND |
| 2022-01-10 | AY00554-POCS | ND |
| 2022-09-20 | AY16882-POCS | ND |
| 2022-09-20 | AY16884-POCS | ND |
| 2023-01-23 | AZ01383-POCS | ND |
| 2023-09-14 | AZ16694-POCS | ND |
| 2023-09-14 | AZ16996-POCS | ND |
| 2023-09-28 | AZ17943-POCS | ND |
| 2023-10-04 | 1.232483-POCS | ND |
| 2023-10-04 | 1.232484-POCS | ND |