Diquat
Carthage
Diquat is a herbicide used on potato crops and aquatic weeds.
9
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 | ND | 1 | 0 | ND |
| 2019 | ND | 1 | 0 | ND |
| 2020 | ND | 1 | 0 | ND |
| 2021 | ND | 1 | 0 | ND |
| 2022 | ND | 3 | 0 | ND |
| 2023 | ND | 2 | 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 |
|---|---|---|
| 2018-05-07 | 39201701 | ND |
| 2019-04-07 | 43308601 | ND |
| 2020-05-18 | 2005E75-001E | ND |
| 2021-05-25 | 2105Q83-001F | ND |
| 2022-04-26 | 2204M85-001G | ND |
| 2022-07-06 | 2207405-001G | ND |
| 2022-12-07 | FL02069-01 | ND |
| 2023-01-12 | GA02520-01 | ND |
| 2023-05-05 | GE01478-01 | ND |