Diquat
Slippery Rock Municipal Authority
Diquat is a herbicide used on potato crops and aquatic weeds.
10
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 | 2 | 0 | ND |
| 2019 | N/A | 0 | 0 | N/A |
| 2020 | ND | 4 | 0 | ND |
| 2021 | N/A | 0 | 0 | N/A |
| 2022 | N/A | 0 | 0 | N/A |
| 2023 | ND | 4 | 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 |
|---|---|---|
| 2018-03-15 | 2302800001 | ND |
| 2018-09-27 | 2341473001 | ND |
| 2020-04-09 | 22126556.00 | ND |
| 2020-04-09 | 22126586.00 | ND |
| 2020-07-09 | 22709959.00 | ND |
| 2020-08-19 | 22906850.00 | ND |
| 2023-05-04 | 29011956.00 | ND |
| 2023-05-04 | 29011957.00 | ND |
| 2023-08-10 | 29609021.00 | ND |
| 2023-08-10 | 29609050.00 | ND |