Diquat
Bryan County Rural Water District #9
Diquat is a herbicide used on potato crops and aquatic weeds.
25
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 | 12 | 0 | ND |
| 2021 | ND | 7 | 0 | ND |
| 2022 | ND | 5 | 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
| Date | Lab ID | Result |
|---|---|---|
| 2020-03-02 | SDWA-1470003-00 | ND |
| 2020-03-02 | SDWA-1470003-09 | ND |
| 2020-03-02 | SDWA-1470004-00 | ND |
| 2020-03-02 | SDWA-1470004-09 | ND |
| 2020-03-02 | SDWA-1470005-00 | ND |
| 2020-03-02 | SDWA-1470005-09 | ND |
| 2020-03-02 | SDWA-1470054-00 | ND |
| 2020-03-02 | SDWA-1470054-15 | ND |
| 2020-09-01 | SDWA-1516099-00 | ND |
| 2020-09-01 | SDWA-1516100-00 | ND |
| 2020-09-01 | SDWA-1516101-00 | ND |
| 2020-09-01 | SDWA-1516075-00 | ND |
| 2021-09-09 | SDWA-1603650-00 | ND |
| 2021-09-09 | SDWA-1603649-00 | ND |
| 2021-09-09 | SDWA-1603648-00 | ND |
| 2021-11-02 | SDWA-1641421-00 | ND |
| 2021-11-02 | SDWA-1641474-00 | ND |
| 2021-11-02 | SDWA-1641423-00 | ND |
| 2021-11-02 | SDWA-1641422-00 | ND |
| 2022-03-07 | SDWA-1674251-00 | ND |
| 2022-04-20 | SDWA-1684779-00 | ND |
| 2022-04-20 | SDWA-1684806-00 | ND |
| 2022-04-20 | SDWA-1684830-00 | ND |
| 2022-04-20 | SDWA-1684848-00 | ND |
| 2023-12-15 | SDWA-1859120-00 | ND |