Diquat
Paw Penn District
Diquat is a herbicide used on potato crops and aquatic weeds.
37
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 | ND | 1 | 0 | ND |
| 2019 | ND | 3 | 0 | ND |
| 2020 | ND | 16 | 0 | ND |
| 2021 | ND | 1 | 0 | ND |
| 2022 | ND | 1 | 0 | ND |
| 2023 | ND | 15 | 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 |
|---|---|---|
| 2018-01-11 | 38160801 | ND |
| 2019-01-09 | 42498901 | ND |
| 2019-07-15 | 45716201 | ND |
| 2019-10-31 | 43999701 | ND |
| 2020-01-06 | 21542590.00 | ND |
| 2020-04-06 | 22069249.00 | ND |
| 2020-04-06 | 22069220.00 | ND |
| 2020-04-08 | 22069438.00 | ND |
| 2020-04-08 | 22069380.00 | ND |
| 2020-04-14 | 22069351.00 | ND |
| 2020-04-16 | 22069409.00 | ND |
| 2020-04-16 | 22069467.00 | ND |
| 2020-05-06 | 22261477.00 | ND |
| 2020-07-01 | 22652388.00 | ND |
| 2020-07-01 | 22652301.00 | ND |
| 2020-07-01 | 22652272.00 | ND |
| 2020-07-09 | 22652214.00 | ND |
| 2020-07-09 | 22652330.00 | ND |
| 2020-07-09 | 22652243.00 | ND |
| 2020-07-13 | 22652359.00 | ND |
| 2021-04-21 | 24290978.00 | ND |
| 2022-01-05 | 25982868.00 | ND |
| 2023-01-05 | 28212758.00 | ND |
| 2023-04-06 | 28749310.00 | ND |
| 2023-04-06 | 28749478.00 | ND |
| 2023-04-06 | 28749439.00 | ND |
| 2023-04-13 | 28749424.00 | ND |
| 2023-04-13 | 28749368.00 | ND |
| 2023-04-13 | 28749339.00 | ND |
| 2023-06-07 | 29155719.00 | ND |
| 2023-07-13 | 29346867.00 | ND |
| 2023-07-13 | 29346817.00 | ND |
| 2023-07-13 | 29346788.00 | ND |
| 2023-07-13 | 29346885.00 | ND |
| 2023-07-20 | 29346701.00 | ND |
| 2023-07-20 | 29346759.00 | ND |
| 2023-07-20 | 29346757.00 | ND |