1,2,4-Trichlorobenzene
Harris County Fresh Water Supply District 1a
NOTE: Harris County Fresh Water Supply District 1a purchases water from Baytown Area Water Authority which is required to test for 1,2,4-trichlorobenzene. Sample information shown below was taken by Baytown Area Water Authority.
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 | 1 | 0 | ND |
| 2019 | ND | 1 | 0 | ND |
| 2020 | ND | 1 | 0 | ND |
| 2021 | ND | 1 | 0 | ND |
| 2022 | ND | 1 | 0 | ND |
| 2023 | ND | 1 | 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
NOTE: Harris County Fresh Water Supply District 1a purchases water from Baytown Area Water Authority which is required to test for 1,2,4-trichlorobenzene. Sample information shown below was taken by Baytown Area Water Authority.
| Date | Lab ID | Result |
|---|---|---|
| 2018-08-03 | AE35860 | ND |
| 2019-09-06 | AE82509 | ND |
| 2020-07-14 | AF19344 | ND |
| 2021-08-09 | AF65379 | ND |
| 2021-10-20 | AF74188 | ND |
| 2022-01-12 | AF80002 | ND |
| 2022-04-04 | AF91855 | ND |
| 2022-07-05 | AG03267 | ND |
| 2022-07-05 | AG03269 | ND |
| 2023-01-12 | AG24428 | ND |
| 2023-07-11 | AG47888 | ND |