Diquat
Tipton
NOTE: Tipton purchases water from Frederick which is required to test for diquat. Sample information shown below was taken by Frederick.
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 | 2 | 0 | ND |
| 2019 | ND | 3 | 0 | ND |
| 2020 | ND | 2 | 0 | ND |
| 2021 | ND | 4 | 0 | ND |
| 2022 | ND | 2 | 0 | ND |
| 2023 | ND | 2 | 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: Tipton purchases water from Frederick which is required to test for diquat. Sample information shown below was taken by Frederick.
| Date | Lab ID | Result |
|---|---|---|
| 2018-07-24 | AG25016-01 | ND |
| 2018-10-09 | AJ10025-01 | ND |
| 2019-01-17 | BA18010-01 | ND |
| 2019-04-10 | BD11004-01 | ND |
| 2019-08-13 | BH14007-01 | ND |
| 2020-05-19 | CE20009-01 | ND |
| 2020-07-28 | CG29004-01 | ND |
| 2021-06-08 | DF09018-01 | ND |
| 2021-09-13 | DI14006-01 | ND |
| 2022-06-13 | EF14012-01 | ND |
| 2022-11-15 | EK15105-01 | ND |
| 2023-03-21 | FC21108-01 | ND |
| 2023-06-26 | FF26014-01 | ND |