Diquat
State College Boro Water Auth.
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 |
|---|---|---|
| 2020-05-13 | 22292185.00 | ND |
| 2020-05-13 | 22292158.00 | ND |
| 2020-05-13 | 22292266.00 | ND |
| 2020-05-13 | 22292212.00 | ND |
| 2020-05-13 | 22292239.00 | ND |
| 2020-08-17 | 23069128.00 | ND |
| 2020-08-17 | 22876893.00 | ND |
| 2020-08-17 | 22876870.00 | ND |
| 2020-08-17 | 22876913.00 | ND |
| 2020-09-22 | 23069443.00 | ND |
| 2023-05-15 | 28981623.00 | ND |
| 2023-05-15 | 28981614.00 | ND |
| 2023-05-15 | 28981637.00 | ND |
| 2023-05-15 | 28981651.00 | ND |
| 2023-05-15 | 28981605.00 | ND |
| 2023-08-14 | 29577850.00 | ND |
| 2023-08-16 | 29578216.00 | ND |
| 2023-08-16 | 29578158.00 | ND |
| 2023-08-16 | 29578245.00 | ND |
| 2023-08-16 | 29578187.00 | ND |