Diquat
Stillwater
Diquat is a herbicide used on potato crops and aquatic weeds.
32
Samples
0
Samples exceeding legal limit (MCL)
0
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 | 14 | 0 | ND |
| 2022 | ND | 17 | 0 | ND |
| 2023 | ND | 1 | 0 | ND |
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
| Date | Lab ID | Result |
|---|---|---|
| 2021-08-18 | 4990852 | ND |
| 2021-08-18 | 4990850 | ND |
| 2021-08-18 | 4990848 | ND |
| 2021-08-18 | 4990739 | ND |
| 2021-08-18 | 4990737 | ND |
| 2021-08-18 | 4990735 | ND |
| 2021-08-18 | 4990733 | ND |
| 2021-11-19 | 8237-7 | ND |
| 2021-11-19 | 8237-6 | ND |
| 2021-11-19 | 8237-5 | ND |
| 2021-11-19 | 8237-4 | ND |
| 2021-11-19 | 8237-3 | ND |
| 2021-11-19 | 8237-2 | ND |
| 2021-11-19 | 8237-1 | ND |
| 2022-02-08 | 14223-2 | ND |
| 2022-02-08 | 14223-1 | ND |
| 2022-02-08 | 14226-1 | ND |
| 2022-02-08 | 14226-2 | ND |
| 2022-02-08 | 14226-3 | ND |
| 2022-04-21 | 22025-4 | ND |
| 2022-04-21 | 22025-1 | ND |
| 2022-04-21 | 22025-2 | ND |
| 2022-04-21 | 22025-3 | ND |
| 2022-04-21 | 22025-5 | ND |
| 2022-04-21 | 22025-6 | ND |
| 2022-06-08 | 27036-1 | ND |
| 2022-06-08 | 27036-2 | ND |
| 2022-08-23 | 35201-3 | ND |
| 2022-08-23 | 35201-1 | ND |
| 2022-08-23 | 35201-2 | ND |
| 2022-11-22 | 45402-1 | ND |
| 2023-03-07 | 55738-1 | ND |