Diquat
Oakview Water Corporation
Diquat is a herbicide used on potato crops and aquatic weeds.
21
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 | 9 | 0 | ND |
| 2021 | ND | 6 | 0 | ND |
| 2022 | ND | 3 | 0 | ND |
| 2023 | ND | 3 | 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 |
|---|---|---|
| 2020-02-26 | 2002643 | ND |
| 2020-03-04 | 100104-01 | ND |
| 2020-03-11 | 100286-01 | ND |
| 2020-07-14 | 101916-01 | ND |
| 2020-07-14 | 101917-01 | ND |
| 2020-07-14 | 101918-01 | ND |
| 2020-09-29 | 103000-01 | ND |
| 2020-09-29 | 103001-01 | ND |
| 2020-11-03 | 103535-01 | ND |
| 2021-03-09 | 105357-01 | ND |
| 2021-03-09 | 105356-01 | ND |
| 2021-03-10 | 105358-01 | ND |
| 2021-04-13 | 105834-01 | ND |
| 2021-04-13 | 105835-01 | ND |
| 2021-04-21 | 105921-01 | ND |
| 2022-04-05 | 110971-01 | ND |
| 2022-04-05 | 110972-01 | ND |
| 2022-07-12 | 112482-01 | ND |
| 2023-05-16 | 117057-01 | ND |
| 2023-05-16 | 117058-01 | ND |
| 2023-05-16 | 117059-01 | ND |