1,2,4-Trichlorobenzene
Marble Community Water System
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 | N/A | 0 | 0 | N/A |
| 2020 | ND | 1 | 0 | ND |
| 2021 | ND | 4 | 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 |
|---|---|---|
| 2018-03-19 | 92377444001VOC | ND |
| 2020-03-16 | 92469616001_12710 | ND |
| 2021-03-29 | 92530231001A_12710 | ND |
| 2021-06-15 | 92544634001_12710 | ND |
| 2021-08-11 | 92555441001_12710 | ND |
| 2021-10-19 | 92567887001_12710 | ND |
| 2022-02-09 | 92587505001_12710 | ND |
| 2022-05-11 | 92604135001_12710 | ND |
| 2022-09-12 | 2093908-01 | ND |
| 2023-07-10 | 37729_23-36797 | ND |
| 2023-07-10 | 37729_23-36799 | ND |