Diquat
Pennsylvania American Royersford
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 | N/A | 0 | 0 | N/A |
| 2020 | ND | 11 | 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 |
|---|---|---|
| 2020-04-08 | 22016230.00 | ND |
| 2020-04-08 | 22016114.00 | ND |
| 2020-04-15 | 22016315.00 | ND |
| 2020-04-15 | 22016287.00 | ND |
| 2020-04-15 | 22016259.00 | ND |
| 2020-07-07 | 22601604.00 | ND |
| 2020-08-04 | 22792308.00 | ND |
| 2020-08-05 | 22792293.00 | ND |
| 2020-08-11 | 22792237.00 | ND |
| 2020-08-11 | 22792265.00 | ND |
| 2020-08-18 | 22792678.00 | ND |
| 2023-05-01 | 28893351.00 | ND |
| 2023-05-01 | 28893379.00 | ND |
| 2023-05-01 | 28893311.00 | ND |
| 2023-05-11 | 28893349.00 | ND |
| 2023-05-11 | 28893407.00 | ND |
| 2023-07-06 | 29296056.00 | ND |
| 2023-08-10 | 29491104.00 | ND |
| 2023-08-10 | 29491071.00 | ND |
| 2023-08-10 | 29491127.00 | ND |
| 2023-08-10 | 29491040.00 | ND |