1,2,4-Trichlorobenzene
Frognot Water Supply Corporation
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 | 4 | 0 | ND |
| 2021 | ND | 2 | 0 | ND |
| 2022 | ND | 2 | 0 | ND |
| 2023 | ND | 3 | 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 |
|---|---|---|
| 2018-04-19 | Q1816227008 | ND |
| 2018-06-20 | Q1824690001 | ND |
| 2019-03-18 | Q1911123002 | ND |
| 2019-08-12 | Q1954104001 | ND |
| 2020-03-10 | Q2009278009 | ND |
| 2020-03-10 | Q2009278011 | ND |
| 2020-03-10 | Q2009278013 | ND |
| 2020-05-12 | Q2018415002 | ND |
| 2021-07-13 | Q2118248008 | ND |
| 2021-07-13 | Q2118248010 | ND |
| 2022-05-11 | Q2214187002 | ND |
| 2022-05-11 | Q2214187005 | ND |
| 2023-03-14 | Q2310003002 | ND |
| 2023-03-14 | Q2310003004 | ND |
| 2023-03-14 | Q2310003006 | ND |