1,2,4-Trichlorobenzene
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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 | 4 | 0 | ND |
| 2019 | ND | 4 | 0 | ND |
| 2020 | ND | 3 | 0 | ND |
| 2021 | ND | 4 | 0 | ND |
| 2022 | ND | 4 | 0 | ND |
| 2023 | ND | 4 | 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 |
|---|---|---|
| 2018-03-14 | 371423001 | ND |
| 2018-05-29 | 385147001 | ND |
| 2018-08-22 | 403173001 | ND |
| 2018-10-23 | 199879 | ND |
| 2019-03-20 | 436653001 | ND |
| 2019-06-24 | 453752001 | ND |
| 2019-08-19 | 464655001 | ND |
| 2019-12-18 | 487030001 | ND |
| 2020-05-12 | 1188026 | ND |
| 2020-09-24 | 1219644 | ND |
| 2020-10-21 | 1225956 | ND |
| 2021-01-28 | 1238946 | ND |
| 2021-04-19 | 1250918 | ND |
| 2021-09-01 | 1276129 | ND |
| 2021-11-08 | 1289483 | ND |
| 2022-03-14 | 5040671A | ND |
| 2022-04-05 | 5040801A | ND |
| 2022-07-26 | 52025291 | ND |
| 2022-10-11 | 52036553 | ND |
| 2023-03-23 | 53012772 | ND |
| 2023-05-10 | 53019602 | ND |
| 2023-07-19 | 53028169 | ND |
| 2023-10-04 | 53038727 | ND |