1,2,4-Trichlorobenzene
Tahlequah PWA
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 |
|---|---|---|---|---|
| 2013 | N/A | 0 | 0 | N/A |
| 2014 | ND | 4 | 0 | ND |
| 2015 | ND | 4 | 0 | ND |
| 2016 | ND | 4 | 0 | ND |
| 2017 | ND | 1 | 0 | ND |
| 2018 | ND | 1 | 0 | ND |
| 2019 | ND | 2 | 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 |
|---|---|---|
| 2014-03-18 | 4C19114-01 | ND |
| 2014-05-06 | 4E07128-01 | ND |
| 2014-07-22 | 4G23092-01 | ND |
| 2014-10-21 | 4J22060-01 | ND |
| 2015-03-24 | 5C25045-01 | ND |
| 2015-05-26 | 5E27065-01 | ND |
| 2015-09-15 | 5I16064-01 | ND |
| 2015-12-08 | 5L09067-01 | ND |
| 2016-03-08 | 6C09092-01 | ND |
| 2016-03-08 | 6C09093-01 | ND |
| 2016-05-10 | 6E11039-01 | ND |
| 2016-09-27 | 6I28024-01 | ND |
| 2017-02-07 | 7B08033-01 | ND |
| 2018-02-06 | AB07206-01 | ND |
| 2019-03-26 | BC27034-01 | ND |
| 2019-10-29 | BJ30058-01 | ND |