Diquat
Whitehall Twp Authority
Diquat is a herbicide used on potato crops and aquatic weeds.
20
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 | 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 |
|---|---|---|
| 2020-05-19 | 22274546.00 | ND |
| 2020-05-19 | 22274426.00 | ND |
| 2020-05-19 | 22274516.00 | ND |
| 2020-05-19 | 22274486.00 | ND |
| 2020-05-19 | 22274456.00 | ND |
| 2020-08-04 | 22857088.00 | ND |
| 2020-08-04 | 22857118.00 | ND |
| 2020-08-04 | 22857058.00 | ND |
| 2020-08-04 | 22857028.00 | ND |
| 2020-08-04 | 22856998.00 | ND |
| 2023-05-02 | 28962462.00 | ND |
| 2023-05-02 | 28962463.00 | ND |
| 2023-05-02 | 28962461.00 | ND |
| 2023-05-02 | 28962459.00 | ND |
| 2023-05-02 | 28962460.00 | ND |
| 2023-08-01 | 29558726.00 | ND |
| 2023-08-01 | 29558724.00 | ND |
| 2023-08-01 | 29558727.00 | ND |
| 2023-08-01 | 29558725.00 | ND |
| 2023-08-01 | 29558728.00 | ND |