Diquat
Germantown
NOTE: Germantown purchases water from Breese which is required to test for diquat. Sample information shown below was taken by Breese.
Diquat is a herbicide used on potato crops and aquatic weeds.
Samples
Samples exceeding legal limit (MCL)
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2018 | ND | 1 | 0 | ND |
| 2019 | ND | 1 | 0 | ND |
| 2020 | ND | 1 | 0 | ND |
| 2021 | ND | 1 | 0 | ND |
| 2022 | ND | 1 | 0 | ND |
| 2023 | ND | 1 | 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
NOTE: Germantown purchases water from Breese which is required to test for diquat. Sample information shown below was taken by Breese.
| Date | Lab ID | Result |
|---|---|---|
| 2018-04-12 | 8042654-01 | ND |
| 2019-04-09 | 9042429-01 | ND |
| 2020-04-13 | 0042460-01 | ND |
| 2021-04-15 | ED03365-01 | ND |
| 2022-04-27 | FD04969-01 | ND |
| 2023-06-21 | GF04162-01 | ND |