1,2,4-Trichlorobenzene
City of San Juan Capistrano
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 | ND | 3 | 0 | ND |
| 2016 | ND | 1 | 0 | ND |
| 2017 | ND | 1 | 0 | ND |
| 2018 | ND | 1 | 0 | ND |
| 2019 | ND | 3 | 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 |
|---|---|---|
| 2014-12-23 | 9590-010-1508 | ND |
| 2015-02-10 | 9590-010-1111 | ND |
| 2015-05-19 | 9590-010-0808 | ND |
| 2015-08-24 | 9590-010-0911 | ND |
| 2016-02-29 | 9590-010-0809 | ND |
| 2017-02-08 | 9590-010-0815 | ND |
| 2018-06-13 | 9590-010-1322 | ND |
| 2019-03-27 | 4792-010-0715 | ND |
| 2019-07-08 | 4792-010-1215 | ND |
| 2019-10-15 | 4792-010-1230 | ND |