Diquat
Swta - Main System
Diquat is a herbicide used on potato crops and aquatic weeds.
28
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 | 14 | 0 | ND |
| 2021 | N/A | 0 | 0 | N/A |
| 2022 | N/A | 0 | 0 | N/A |
| 2023 | ND | 14 | 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 |
|---|---|---|
| 2020-04-07 | 22080435.00 | ND |
| 2020-04-07 | 22080465.00 | ND |
| 2020-04-07 | 22080525.00 | ND |
| 2020-04-07 | 22080405.00 | ND |
| 2020-04-07 | 22080495.00 | ND |
| 2020-04-07 | 22080375.00 | ND |
| 2020-04-07 | 22080345.00 | ND |
| 2020-07-28 | 22854596.00 | ND |
| 2020-07-28 | 22854656.00 | ND |
| 2020-07-28 | 22854746.00 | ND |
| 2020-07-28 | 22854626.00 | ND |
| 2020-07-28 | 22854566.00 | ND |
| 2020-07-28 | 22854686.00 | ND |
| 2020-07-28 | 22854716.00 | ND |
| 2023-05-02 | 28960645.00 | ND |
| 2023-05-02 | 28960644.00 | ND |
| 2023-05-02 | 28960647.00 | ND |
| 2023-05-02 | 28960643.00 | ND |
| 2023-05-02 | 28960646.00 | ND |
| 2023-05-02 | 28960642.00 | ND |
| 2023-06-27 | 29166826.00 | ND |
| 2023-08-08 | 29556329.00 | ND |
| 2023-08-08 | 29556331.00 | ND |
| 2023-08-08 | 29556332.00 | ND |
| 2023-08-08 | 29556328.00 | ND |
| 2023-08-08 | 29556333.00 | ND |
| 2023-08-08 | 29556327.00 | ND |
| 2023-08-08 | 29556330.00 | ND |