Diquat
Lehigh County Authority Allentown Division
Diquat is a herbicide used on potato crops and aquatic weeds.
18
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 | 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 | 22077915.00 | ND |
| 2020-04-14 | 22077871.00 | ND |
| 2020-04-14 | 22077835.00 | ND |
| 2020-04-22 | 22078449.00 | ND |
| 2020-07-08 | 22660555.00 | ND |
| 2020-07-16 | 22660595.00 | ND |
| 2020-07-22 | 22660669.00 | ND |
| 2020-07-22 | 22660631.00 | ND |
| 2023-04-11 | 28759078.00 | ND |
| 2023-04-11 | 28759079.00 | ND |
| 2023-04-19 | 28759255.00 | ND |
| 2023-04-26 | 28958428.00 | ND |
| 2023-04-26 | 28958427.00 | ND |
| 2023-07-11 | 29355944.00 | ND |
| 2023-07-11 | 29355943.00 | ND |
| 2023-07-18 | 29355881.00 | ND |
| 2023-07-18 | 29355882.00 | ND |
| 2023-07-25 | 29554452.00 | ND |