1,2,4-Trichlorobenzene
City of Leon Valley
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 | 8 | 0 | ND |
| 2019 | ND | 7 | 0 | ND |
| 2020 | ND | 8 | 0 | ND |
| 2021 | ND | 8 | 0 | ND |
| 2022 | ND | 8 | 0 | ND |
| 2023 | ND | 8 | 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
| Date | Lab ID | Result |
|---|---|---|
| 2018-01-23 | AE09914 | ND |
| 2018-03-02 | AE16656 | ND |
| 2018-04-26 | AE24190 | ND |
| 2018-04-26 | AE24188 | ND |
| 2018-08-17 | AE37649 | ND |
| 2018-08-17 | AE37653 | ND |
| 2018-10-26 | AE44764 | ND |
| 2018-10-26 | AE44766 | ND |
| 2019-03-01 | AE56915 | ND |
| 2019-03-01 | AE56919 | ND |
| 2019-04-25 | AE63758 | ND |
| 2019-07-19 | AE75356 | ND |
| 2019-07-19 | AE75358 | ND |
| 2019-10-09 | AE86133 | ND |
| 2019-10-09 | AE86135 | ND |
| 2020-01-30 | AE96323 | ND |
| 2020-03-25 | AF04528 | ND |
| 2020-04-09 | AF06303 | ND |
| 2020-04-09 | AF06305 | ND |
| 2020-07-08 | AF18899 | ND |
| 2020-07-08 | AF18901 | ND |
| 2020-11-02 | AF32838 | ND |
| 2020-11-02 | AF32840 | ND |
| 2021-01-14 | AF39552 | ND |
| 2021-01-14 | AF39558 | ND |
| 2021-04-01 | AF48854 | ND |
| 2021-05-13 | AF53869 | ND |
| 2021-08-03 | AF64491 | ND |
| 2021-08-03 | AF64493 | ND |
| 2021-12-09 | AF78497 | ND |
| 2021-12-09 | AF78505 | ND |
| 2022-02-14 | AF84680 | ND |
| 2022-02-14 | AF84682 | ND |
| 2022-04-28 | AF94837 | ND |
| 2022-04-28 | AF94841 | ND |
| 2022-07-15 | AG04971 | ND |
| 2022-07-15 | AG04973 | ND |
| 2022-10-18 | AG17425 | ND |
| 2022-10-18 | AG17427 | ND |
| 2023-02-17 | AG29691 | ND |
| 2023-02-17 | AG29695 | ND |
| 2023-04-21 | AG37706 | ND |
| 2023-04-21 | AG37738 | ND |
| 2023-08-14 | AG52400 | ND |
| 2023-08-14 | AG52408 | ND |
| 2023-10-06 | AG58929 | ND |
| 2023-10-06 | AG58931 | ND |