Diquat
Otwell Water Corporation
NOTE: Otwell Water Corporation purchases water from Patoka Lake Regional Water which is required to test for diquat. Sample information shown below was taken by Patoka Lake Regional Water.
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 | N/A | 0 | 0 | N/A |
| 2020 | N/A | 0 | 0 | N/A |
| 2021 | ND | 1 | 0 | ND |
| 2022 | ND | 3 | 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: Otwell Water Corporation purchases water from Patoka Lake Regional Water which is required to test for diquat. Sample information shown below was taken by Patoka Lake Regional Water.
| Date | Lab ID | Result |
|---|---|---|
| 2018-05-16 | 416929RS28-1802 | ND |
| 2018-08-16 | 426574RS28-1803 | ND |
| 2021-08-18 | 4990898 | ND |
| 2021-11-10 | 1-810-7353-1 | ND |
| 2022-05-10 | 1-810-24180-1 | ND |
| 2022-08-16 | 1-810-34359-1_IN | ND |
| 2022-11-08 | 1-810-43880-1_IN | ND |
| 2023-05-09 | 1-810-62557-1_IN | ND |
| 2023-08-09 | 1-810-73252-1_IN | ND |