Diquat
Bloomington
NOTE: Bloomington purchases water from Minneapolis which is required to test for diquat. Sample information shown below was taken by Minneapolis.
Diquat is a herbicide used on potato crops and aquatic weeds.
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 | N/A | 0 | 0 | N/A |
| 2019 | N/A | 0 | 0 | N/A |
| 2020 | N/A | 0 | 0 | N/A |
| 2021 | ND | 1 | 0 | ND |
| 2022 | ND | 3 | 0 | ND |
| 2023 | N/A | 0 | 0 | N/A |
ppb = parts per billion
State, National, and Health Guidelines for Drinking Water
EWG Health Guideline: 6 ppb
The EWG Health Guideline of 6 ppb for diquat 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 cataracts.
EPA Maximum Contaminant
Level (MCL): 20 ppb
The legal limit for diquat, established in 1992, was based on a toxicity study in laboratory animals conducted in the 1980s.
ppb = parts per billion
All test results
NOTE: Bloomington purchases water from Minneapolis which is required to test for diquat. Sample information shown below was taken by Minneapolis.
| Date | Lab ID | Result |
|---|---|---|
| 2021-09-08 | 1531-1 | ND |
| 2021-09-08 | 1531-2 | ND |
| 2021-12-16 | 10390-1 | ND |
| 2021-12-16 | 10390-2 | ND |
| 2022-02-14 | 14928-1 | ND |
| 2022-02-14 | 14928-2 | ND |
| 2022-05-10 | 24213-1 | ND |
| 2022-05-10 | 24213-2 | ND |