Diquat
Schuylkill County. Municipal Authority
Diquat is a herbicide used on potato crops and aquatic weeds.
16
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 | 8 | 0 | ND |
| 2021 | N/A | 0 | 0 | N/A |
| 2022 | N/A | 0 | 0 | N/A |
| 2023 | ND | 8 | 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 |
|---|---|---|
| 2020-04-29 | 22281724.00 | ND |
| 2020-04-29 | 22281695.00 | ND |
| 2020-04-29 | 22281782.00 | ND |
| 2020-04-29 | 22281753.00 | ND |
| 2020-07-29 | 22864902.00 | ND |
| 2020-07-29 | 22864873.00 | ND |
| 2020-07-29 | 22864844.00 | ND |
| 2020-08-06 | 22864943.00 | ND |
| 2023-05-08 | 29175405.00 | ND |
| 2023-05-09 | 29175406.00 | ND |
| 2023-05-10 | 29175408.00 | ND |
| 2023-05-11 | 29175407.00 | ND |
| 2023-08-03 | 29762928.00 | ND |
| 2023-08-04 | 29762927.00 | ND |
| 2023-08-09 | 29763027.00 | ND |
| 2023-08-09 | 29763028.00 | ND |