Diquat
Newtown Artesian Water Company
Diquat is a herbicide used on potato crops and aquatic weeds.
14
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 | 4 | 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 |
|---|---|---|
| 2020-05-01 | 22195196.00 | ND |
| 2020-05-01 | 22195225.00 | ND |
| 2020-05-01 | 22195254.00 | ND |
| 2020-05-08 | 22393303.00 | ND |
| 2020-05-08 | 22393332.00 | ND |
| 2020-07-06 | 22587699.00 | ND |
| 2020-07-06 | 22587728.00 | ND |
| 2020-07-06 | 22587757.00 | ND |
| 2020-07-07 | 22587786.00 | ND |
| 2020-07-07 | 22587815.00 | ND |
| 2023-04-03 | 28681839.00 | ND |
| 2023-04-03 | 28681811.00 | ND |
| 2023-07-05 | 29283026.00 | ND |
| 2023-07-06 | 29282998.00 | ND |