1,2,4-Trichlorobenzene
Opp Utilities Board
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 |
|---|---|---|---|---|
| 2014 | ND | 1 | 0 | ND |
| 2015 | N/A | 0 | 0 | N/A |
| 2016 | ND | 5 | 0 | ND |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | N/A | 0 | 0 | N/A |
| 2019 | ND | 6 | 0 | ND |
ppb = parts per billion
State and national drinking water standards and health guidelines
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 |
|---|---|---|
| 2014-08-20 | 375-082014-VOC-1 | ND |
| 2016-09-06 | 37509062016-3V | ND |
| 2016-09-06 | 37509062016-4V | ND |
| 2016-09-06 | 37509062016-1V | ND |
| 2016-09-06 | 37509062016-5V | ND |
| 2016-09-06 | 37509062016-2V | ND |
| 2019-02-20 | 187669-07VOC | ND |
| 2019-02-20 | 187669-04VOC | ND |
| 2019-02-20 | 187669-06VOC | ND |
| 2019-02-20 | 187669-03VOC | ND |
| 2019-02-20 | 187669-05VOC | ND |
| 2019-02-20 | 187669-01VOC | ND |