1,2,4-Trichlorobenzene
Harris County FWSD 61
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 | 6 | 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 |
|---|---|---|
| 2014-02-04 | AC41253 | ND |
| 2015-04-01 | AC86960 | ND |
| 2015-04-01 | AC86966 | ND |
| 2015-04-01 | AC86972 | ND |
| 2015-04-01 | AC86968 | ND |
| 2015-09-18 | AD07856 | ND |
| 2015-10-12 | AD10264 | ND |
| 2016-01-12 | AD17578 | ND |
| 2016-01-12 | AD17584 | ND |
| 2016-01-12 | AD17592 | ND |
| 2016-01-12 | AD17582 | ND |
| 2017-02-02 | AD68419 | ND |
| 2017-02-02 | AD68455 | ND |
| 2017-02-02 | AD68425 | ND |
| 2017-02-02 | AD68423 | ND |
| 2018-03-01 | AE16318 | ND |
| 2018-03-01 | AE16344 | ND |
| 2018-03-01 | AE16320 | ND |
| 2018-03-01 | AE16316 | ND |
| 2019-01-09 | AE49217 | ND |
| 2019-01-09 | AE49223 | ND |
| 2019-01-09 | AE49221 | ND |
| 2019-01-09 | AE49215 | ND |