1,2,4-Trichlorobenzene
City of Caldwell
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 | ND | 7 | 0 | ND |
| 2020 | N/A | 0 | 0 | N/A |
| 2021 | ND | 10 | 0 | ND |
| 2022 | N/A | 0 | 0 | N/A |
| 2023 | N/A | 0 | 0 | N/A |
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 |
|---|---|---|
| 2019-08-06 | V1938594 | ND |
| 2019-08-06 | V1938597 | ND |
| 2019-08-19 | V1941181 | ND |
| 2019-08-19 | V1941183 | ND |
| 2019-08-19 | V1941174 | ND |
| 2019-08-19 | V1941177 | ND |
| 2019-08-19 | V1941179 | ND |
| 2021-06-30 | V2132702 | ND |
| 2021-06-30 | V2132703 | ND |
| 2021-08-02 | V2139301 | ND |
| 2021-08-02 | V2139302 | ND |
| 2021-09-16 | V2148955 | ND |
| 2021-09-16 | V2148956 | ND |
| 2021-10-28 | V2158341 | ND |
| 2021-10-28 | V2158343 | ND |
| 2021-10-28 | V2158342 | ND |
| 2021-11-15 | V2162140 | ND |