1,2,4-Trichlorobenzene
San Antonio Water Company
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 | N/A | 0 | 0 | N/A |
| 2019 | ND | 9 | 0 | ND |
| 2020 | ND | 1 | 0 | ND |
| 2021 | N/A | 0 | 0 | N/A |
| 2022 | ND | 10 | 0 | ND |
| 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 |
|---|---|---|
| 2019-07-16 | CA3610085_003_003-201907161305 | ND |
| 2019-07-16 | CA3610085_016_016-201907161200 | ND |
| 2019-07-16 | CA3610085_011_011-201907161250 | ND |
| 2019-07-16 | CA3610085_002_002-201907161140 | ND |
| 2019-07-16 | CA3610085_001_001-201907161100 | ND |
| 2019-07-16 | CA3610085_018_018-201907161130 | ND |
| 2019-07-16 | CA3610085_013_013-201907161350 | ND |
| 2019-07-16 | CA3610085_017_017-201907161330 | ND |
| 2019-07-17 | CA3610085_004_004-201907170800 | ND |
| 2020-04-07 | CA3610085_021_021-202004071020 | ND |
| 2022-07-20 | CA3610085_004_004-202207200945 | ND |
| 2022-07-20 | CA3610085_017_017-202207201100 | ND |
| 2022-07-20 | CA3610085_003_003-202207201030 | ND |
| 2022-07-20 | CA3610085_013_013-202207201130 | ND |
| 2022-07-20 | CA3610085_002_002-202207201230 | ND |
| 2022-07-20 | CA3610085_001_001-202207201200 | ND |
| 2022-07-20 | CA3610085_011_011-202207201010 | ND |
| 2022-07-20 | CA3610085_018_018-202207201300 | ND |
| 2022-07-21 | CA3610085_016_016-202207211030 | ND |
| 2022-07-21 | CA3610085_021_021-202207210945 | ND |