Diquat
Paw Blue Mountain Division
Diquat is a herbicide used on potato crops and aquatic weeds.
21
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 | ND | 1 | 0 | ND |
| 2020 | ND | 10 | 0 | ND |
| 2021 | N/A | 0 | 0 | N/A |
| 2022 | N/A | 0 | 0 | N/A |
| 2023 | ND | 10 | 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 |
|---|---|---|
| 2019-07-16 | 45238801 | ND |
| 2020-04-22 | 22086532.00 | ND |
| 2020-04-29 | 22278276.00 | ND |
| 2020-04-29 | 22278347.00 | ND |
| 2020-05-11 | 22278405.00 | ND |
| 2020-05-11 | 22278376.00 | ND |
| 2020-07-20 | 22668158.00 | ND |
| 2020-07-20 | 22668129.00 | ND |
| 2020-08-17 | 22861739.00 | ND |
| 2020-08-17 | 22861681.00 | ND |
| 2020-08-17 | 22861710.00 | ND |
| 2023-04-10 | 28766828.00 | ND |
| 2023-04-10 | 28766820.00 | ND |
| 2023-04-11 | 28766770.00 | ND |
| 2023-04-11 | 28766679.00 | ND |
| 2023-06-07 | 29172399.00 | ND |
| 2023-07-12 | 29363499.00 | ND |
| 2023-07-12 | 29363440.00 | ND |
| 2023-07-24 | 29363577.00 | ND |
| 2023-07-24 | 29363527.00 | ND |
| 2023-07-24 | 29363496.00 | ND |