1,2,4-Trichlorobenzene
Westbound Water Supply Corporation Cisco Source
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 | 2 | 0 | ND |
| 2022 | ND | 2 | 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 |
|---|---|---|
| 2018-11-28 | Q1848312002 | ND |
| 2018-11-28 | Q1848312004 | ND |
| 2019-12-17 | Q1980357004 | ND |
| 2019-12-17 | Q1980357006 | ND |
| 2020-11-09 | Q2043631003 | ND |
| 2020-11-09 | Q2043631009 | ND |
| 2021-02-09 | Q2103863001 | ND |
| 2021-02-09 | Q2103863003 | ND |
| 2022-02-16 | Q2205765002 | ND |
| 2022-02-16 | Q2205765004 | ND |
| 2023-02-07 | Q2304671006 | ND |
| 2023-07-12 | Q2327347004 | ND |