1,2,4-Trichlorobenzene
Town of Hampstead
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 | 2 | 0 | ND |
| 2019 | ND | 7 | 0 | ND |
| 2020 | ND | 7 | 0 | ND |
| 2021 | ND | 5 | 0 | ND |
| 2022 | ND | 2 | 0 | ND |
| 2023 | ND | 2 | 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 |
|---|---|---|
| 2018-10-02 | E19001151004 | ND |
| 2018-10-02 | E19001151001 | ND |
| 2019-08-28 | E20000817001 | ND |
| 2019-08-28 | E20000817004 | ND |
| 2019-08-28 | E20000817006 | ND |
| 2019-08-28 | E20000817008 | ND |
| 2019-08-28 | E20000817010 | ND |
| 2019-08-28 | E20000817012 | ND |
| 2019-08-28 | E20000817014 | ND |
| 2020-03-03 | E20002984004 | ND |
| 2020-06-03 | E20003719001 | ND |
| 2020-06-03 | E20003719004 | ND |
| 2020-07-29 | E21000294001 | ND |
| 2020-07-29 | E21000294004 | ND |
| 2020-09-01 | E064325-05 | ND |
| 2020-10-28 | E21001178004 | ND |
| 2021-01-21 | E21001850001 | ND |
| 2021-06-03 | E21003568001 | ND |
| 2021-09-08 | E22000814001 | ND |
| 2021-09-08 | E22000814004 | ND |
| 2021-11-08 | E220007804 | ND |
| 2022-03-01 | 0060003_14_030122354 | ND |
| 2022-05-25 | E2201063401 | ND |
| 2023-03-22 | E2300224001 | ND |
| 2023-03-22 | E2300224003 | ND |