1,2,4-Trichlorobenzene
Thousand Trails San Benito Preserve
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 | 11 | 0 | ND |
| 2019 | ND | 5 | 0 | ND |
| 2020 | N/A | 0 | 0 | N/A |
| 2021 | ND | 2 | 0 | ND |
| 2022 | N/A | 0 | 0 | N/A |
| 2023 | N/A | 0 | 0 | N/A |
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 |
|---|---|---|
| 2018-03-28 | CA3500505_002_002-201803281502 | ND |
| 2018-03-28 | CA3500505_001_001-201803281545 | ND |
| 2018-06-21 | CA3500505_005_005-201806211321 | ND |
| 2018-06-21 | CA3500505_001_001-201806211103 | ND |
| 2018-06-21 | CA3500505_002_002-201806211138 | ND |
| 2018-08-08 | CA3500505_001_001-201808080856 | ND |
| 2018-08-08 | CA3500505_002_002-201808080816 | ND |
| 2018-09-13 | CA3500505_005_005-201809131015 | ND |
| 2018-11-14 | CA3500505_005_005-201811141030 | ND |
| 2018-11-27 | CA3500505_002_002-201811271215 | ND |
| 2018-12-11 | CA3500505_001_001-201812111139 | ND |
| 2019-03-26 | CA3500505_001_001-201903261406 | ND |
| 2019-03-26 | CA3500505_005_005-201903261100 | ND |
| 2019-12-23 | CA3500505_005_005-201912230940 | ND |
| 2019-12-23 | CA3500505_001_001-201912231110 | ND |
| 2019-12-23 | CA3500505_002_002-201912231035 | ND |
| 2021-03-15 | CA3500505_005_005-202103151209 | ND |
| 2021-03-29 | CA3500505_001_001-202103290656 | ND |