1,2,4-Trichlorobenzene
City of Houston Willow Chase
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 | N/A | 0 | 0 | N/A |
| 2015 | ND | 4 | 0 | ND |
| 2016 | ND | 4 | 0 | ND |
| 2017 | ND | 4 | 0 | ND |
| 2018 | ND | 4 | 0 | ND |
| 2019 | ND | 4 | 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 |
|---|---|---|
| 2015-05-29 | AC93893 | ND |
| 2015-05-29 | AC93899 | ND |
| 2015-05-29 | AC93891 | ND |
| 2015-05-29 | AC93875 | ND |
| 2016-03-03 | AD26935 | ND |
| 2016-03-03 | AD26933 | ND |
| 2016-03-03 | AD26925 | ND |
| 2016-03-03 | AD26929 | ND |
| 2017-03-02 | AD73126 | ND |
| 2017-03-02 | AD73122 | ND |
| 2017-05-31 | AD86149 | ND |
| 2017-05-31 | AD86147 | ND |
| 2018-04-11 | AE22081 | ND |
| 2018-04-11 | AE22085 | ND |
| 2018-04-11 | AE22055 | ND |
| 2018-04-11 | AE22057 | ND |
| 2019-02-28 | AE56578 | ND |
| 2019-02-28 | AE56614 | ND |
| 2019-02-28 | AE56582 | ND |
| 2019-02-28 | AE56580 | ND |