Diquat
Newberry System
Diquat is a herbicide used on potato crops and aquatic weeds.
24
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 | N/A | 0 | 0 | N/A |
| 2022 | N/A | 0 | 0 | N/A |
| 2023 | ND | 12 | 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 |
|---|---|---|
| 2020-04-23 | 22184196.00 | ND |
| 2020-04-23 | 22184160.00 | ND |
| 2020-04-30 | 22184222.00 | ND |
| 2020-05-19 | 22383223.00 | ND |
| 2020-05-19 | 22383187.00 | ND |
| 2020-05-19 | 22383259.00 | ND |
| 2020-08-13 | 22969991.00 | ND |
| 2020-08-13 | 22969950.00 | ND |
| 2020-08-27 | 22970413.00 | ND |
| 2020-08-27 | 22970339.00 | ND |
| 2020-08-27 | 22970377.00 | ND |
| 2020-08-27 | 22970301.00 | ND |
| 2023-04-04 | 28871728.00 | ND |
| 2023-04-04 | 28871758.00 | ND |
| 2023-04-04 | 28871788.00 | ND |
| 2023-04-12 | 28872012.00 | ND |
| 2023-04-12 | 28872042.00 | ND |
| 2023-04-12 | 28871979.00 | ND |
| 2023-07-13 | 29467489.00 | ND |
| 2023-07-13 | 29467641.00 | ND |
| 2023-07-13 | 29467592.00 | ND |
| 2023-07-18 | 29467519.00 | ND |
| 2023-07-18 | 29467580.00 | ND |
| 2023-07-18 | 29467550.00 | ND |