1,2,4-Trichlorobenzene
Altoona Waterworks
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 | 5 | 0 | ND |
| 2019 | ND | 5 | 0 | ND |
| 2020 | ND | 8 | 0 | ND |
| 2021 | ND | 5 | 0 | ND |
| 2022 | ND | 4 | 0 | ND |
| 2023 | ND | 11 | 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 |
|---|---|---|
| 2018-03-12 | 1044559 | ND |
| 2018-06-19 | 1062457 | ND |
| 2018-06-19 | 1062452 | ND |
| 2018-09-18 | 1081371 | ND |
| 2018-12-17 | 1097851 | ND |
| 2019-03-11 | 1108740 | ND |
| 2019-06-18 | 1128839 | ND |
| 2019-06-18 | 1128844 | ND |
| 2019-09-16 | 1148215 | ND |
| 2019-12-09 | 1164494 | ND |
| 2020-06-16 | 1193784 | ND |
| 2020-06-16 | 1193785 | ND |
| 2020-06-16 | 1193781 | ND |
| 2020-06-16 | 1193782 | ND |
| 2020-06-16 | 1193783 | ND |
| 2020-06-16 | 1193780 | ND |
| 2020-09-15 | 1214813 | ND |
| 2020-12-15 | 1232451 | ND |
| 2021-03-15 | 1243823 | ND |
| 2021-03-15 | 1243823 | ND |
| 2021-06-15 | 1259378 | ND |
| 2021-09-07 | 1275724 | ND |
| 2021-11-08 | 1288394 | ND |
| 2022-01-19 | 1296685 | ND |
| 2022-05-03 | 1311124 | ND |
| 2022-09-21 | 1338361 | ND |
| 2022-10-20 | 1345196 | ND |
| 2023-01-25 | CB00795-02 | ND |
| 2023-01-26 | CB00861-02 | ND |
| 2023-02-08 | CB01247-01 | ND |
| 2023-06-12 | CB06321-09 | ND |
| 2023-07-31 | CB08782-06 | ND |
| 2023-07-31 | CB08782-09 | ND |
| 2023-07-31 | CB08782-12 | ND |
| 2023-07-31 | CB08782-03 | ND |
| 2023-08-01 | CB08877-06 | ND |
| 2023-08-01 | CB08877-03 | ND |
| 2023-11-07 | CB13662-01 | ND |