1,2,4-Trichlorobenzene
City of Tualatin
NOTE: City of Tualatin purchases water from Portland Water Bureau which is required to test for 1,2,4-trichlorobenzene. Sample information shown below was taken by Portland Water Bureau.
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 | 2 | 0 | ND |
| 2020 | ND | 1 | 0 | ND |
| 2021 | ND | 2 | 0 | ND |
| 2022 | ND | 2 | 0 | ND |
| 2023 | ND | 1 | 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
NOTE: City of Tualatin purchases water from Portland Water Bureau which is required to test for 1,2,4-trichlorobenzene. Sample information shown below was taken by Portland Water Bureau.
| Date | Lab ID | Result |
|---|---|---|
| 2018-03-15 | BC03118-V | ND |
| 2018-04-03 | BC04117-V | ND |
| 2019-04-02 | BC21049-V | ND |
| 2019-07-15 | BC25289-V | ND |
| 2020-05-12 | BC38533-V | ND |
| 2020-08-06 | BC41702 | ND |
| 2021-04-06 | BC53668-V | ND |
| 2021-08-04 | BC60213-V | ND |
| 2022-04-05 | BC75262-V | ND |
| 2022-08-03 | BC85642-V | ND |
| 2023-04-04 | BC96020-V | ND |
| 2023-08-29 | BD02264-V | ND |