1,2,4-Trichlorobenzene
City of Sundown
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 | 2 | 0 | ND |
| 2019 | ND | 2 | 0 | ND |
| 2020 | ND | 2 | 0 | ND |
| 2021 | ND | 4 | 0 | ND |
| 2022 | ND | 4 | 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 |
|---|---|---|
| 2018-01-11 | Q1801555016 | ND |
| 2018-01-11 | Q1801555019 | ND |
| 2019-01-08 | Q1900776005 | ND |
| 2019-01-08 | Q1900776007 | ND |
| 2020-01-14 | Q2001302001 | ND |
| 2020-01-14 | Q2001302003 | ND |
| 2021-01-20 | Q2101443003 | ND |
| 2021-04-05 | Q2108480010 | ND |
| 2021-07-01 | Q2117329003 | ND |
| 2021-10-05 | Q2127289002 | ND |
| 2022-01-13 | Q2201435005 | ND |
| 2022-01-13 | Q2201435007 | ND |
| 2022-04-28 | Q2212820002 | ND |
| 2022-09-20 | Q2228114003 | ND |
| 2023-01-09 | Q2300847001 | ND |
| 2023-04-03 | Q2312040006 | ND |