Diquat
Solano Irrigation District - Pleasant Hills Ranch
Diquat is a herbicide used on potato crops and aquatic weeds.
8
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 | 3 | 0 | ND |
| 2019 | N/A | 0 | 0 | N/A |
| 2020 | ND | 4 | 0 | ND |
| 2021 | N/A | 0 | 0 | N/A |
| 2022 | N/A | 0 | 0 | N/A |
| 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 |
|---|---|---|
| 2018-05-10 | CA4810025_004_004-201805101015 | ND |
| 2018-08-23 | CA4810025_004_004-201808230920 | ND |
| 2018-11-15 | CA4810025_004_004-201811151120 | ND |
| 2020-03-10 | CA4810025_001_001-202003101005 | ND |
| 2020-03-10 | CA4810025_003_003-202003101130 | ND |
| 2020-06-22 | CA4810025_003_003-202006221125 | ND |
| 2020-06-22 | CA4810025_001_001-202006221235 | ND |
| 2023-03-16 | CA4810025_001_001-202303160950 | ND |