1,2,4-Trichlorobenzene
Conyngham Water Company
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 | 3 | 0 | ND |
| 2019 | ND | 3 | 0 | ND |
| 2020 | ND | 5 | 0 | ND |
| 2021 | ND | 3 | 0 | ND |
| 2022 | ND | 3 | 0 | ND |
| 2023 | ND | 5 | 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 |
|---|---|---|
| 2018-04-17 | 7048808001 | ND |
| 2018-04-17 | 7048808002 | ND |
| 2018-04-17 | 7048808003 | ND |
| 2019-03-12 | 1903-156-2 | ND |
| 2019-03-12 | 19030-156-1 | ND |
| 2019-03-12 | 1903-156-1 | ND |
| 2020-03-02 | 21862224.00 | ND |
| 2020-03-02 | 21862204.00 | ND |
| 2020-03-02 | 21862184.00 | ND |
| 2020-03-02 | 21862164.00 | ND |
| 2020-03-02 | 21862144.00 | ND |
| 2021-06-01 | 24454884.00 | ND |
| 2021-06-01 | 24454864.00 | ND |
| 2021-06-01 | 24454904.00 | ND |
| 2022-04-04 | 26478811.00 | ND |
| 2022-04-04 | 26478831.00 | ND |
| 2022-04-04 | 26478851.00 | ND |
| 2023-03-06 | 28536369.00 | ND |
| 2023-03-06 | 28536389.00 | ND |
| 2023-03-06 | 28536409.00 | ND |
| 2023-12-12 | 30259319.00 | ND |
| 2023-12-12 | 30259299.00 | ND |