1,2,4-Trichlorobenzene
Madera Valley 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 | 3 | 0 | ND |
| 2019 | ND | 3 | 0 | ND |
| 2020 | ND | 4 | 0 | ND |
| 2021 | ND | 3 | 0 | ND |
| 2022 | ND | 3 | 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 |
|---|---|---|
| 2018-07-18 | Q1828958012 | ND |
| 2018-07-18 | Q1828958014 | ND |
| 2018-07-18 | Q1828958010 | ND |
| 2019-06-20 | Q1938291004 | ND |
| 2019-06-20 | Q1938291006 | ND |
| 2019-06-20 | Q1938291008 | ND |
| 2020-08-17 | Q2033215001 | ND |
| 2020-08-17 | Q2033215003 | ND |
| 2020-08-17 | Q2033215005 | ND |
| 2020-12-02 | Q2048267001 | ND |
| 2021-03-15 | Q2106895001 | ND |
| 2021-03-15 | Q2106895003 | ND |
| 2021-09-13 | Q2125100003 | ND |
| 2022-02-07 | Q2204392003 | ND |
| 2022-02-07 | Q2204392005 | ND |
| 2022-08-31 | Q2225814003 | ND |
| 2023-04-20 | Q2314887001 | ND |
| 2023-04-20 | Q2314887003 | ND |
| 2023-08-30 | Q2337553001 | ND |