Dinoseb
City of Tualatin
NOTE: City of Tualatin purchases water from Portland Water Bureau which is required to test for dinoseb. Sample information shown below was taken by Portland Water Bureau.
Dinoseb is a herbicide that causes birth defects and reproductive difficulties. It has been banned in the U.S. since 1986.
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 | 1 | 0 | ND |
| 2019 | N/A | 0 | 0 | N/A |
| 2020 | ND | 2 | 0 | ND |
| 2021 | ND | 1 | 0 | ND |
| 2022 | N/A | 0 | 0 | N/A |
| 2023 | ND | 2 | 0 | ND |
ppb = parts per billion
State, National, and Health Guidelines for Drinking Water
EPA Maximum Contaminant
Level (MCL): 7 ppb
The legal limit for dinoseb, established in 1992, was based on toxicity studies conducted in laboratory animals in the 1970s and 1980s.
ppb = parts per billion
All test results
NOTE: City of Tualatin purchases water from Portland Water Bureau which is required to test for dinoseb. Sample information shown below was taken by Portland Water Bureau.
| Date | Lab ID | Result |
|---|---|---|
| 2018-03-15 | BC03118-S | ND |
| 2020-05-12 | BC38533-S | ND |
| 2020-08-04 | 202008070432-S | ND |
| 2020-08-05 | 202008070418-S | ND |
| 2021-08-04 | BC60213-S | ND |
| 2023-04-04 | 380-42758-1-S | ND |
| 2023-08-15 | 380-59561-1-S | ND |
| 2023-08-29 | 380-61323-1 | ND |
| 2023-10-02 | 380-65583-1-S | ND |