Diquat
Mt. Joy Boro Authority
Diquat is a herbicide used on potato crops and aquatic weeds.
17
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 | ND | 2 | 0 | ND |
| 2020 | ND | 9 | 0 | ND |
| 2021 | N/A | 0 | 0 | N/A |
| 2022 | N/A | 0 | 0 | N/A |
| 2023 | ND | 6 | 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 |
|---|---|---|
| 2019-08-20 | 9083654-01 | ND |
| 2019-11-07 | 9110611-01 | ND |
| 2020-03-03 | 21981419.00 | ND |
| 2020-04-09 | 22170944.00 | ND |
| 2020-04-09 | 22171111.00 | ND |
| 2020-05-19 | 22368369.00 | ND |
| 2020-06-10 | 22565230.00 | ND |
| 2020-07-21 | 22955050.00 | ND |
| 2020-08-11 | 22955134.00 | ND |
| 2020-09-22 | 23142299.00 | ND |
| 2020-09-22 | 23142329.00 | ND |
| 2023-05-09 | 29059151.00 | ND |
| 2023-05-16 | 29059183.00 | ND |
| 2023-06-05 | 29260257.00 | ND |
| 2023-08-01 | 29657077.00 | ND |
| 2023-08-02 | 29657078.00 | ND |
| 2023-08-15 | 29846310.00 | ND |