Diquat
Salinas Valley State Prison
Diquat is a herbicide used on potato crops and aquatic weeds.
7
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 | 2 | 0 | ND |
| 2019 | N/A | 0 | 0 | N/A |
| 2020 | ND | 2 | 0 | ND |
| 2021 | ND | 2 | 0 | ND |
| 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 |
|---|---|---|
| 2018-01-16 | CA2710851_002_002-201801161015 | ND |
| 2018-04-10 | CA2710851_002_002-201804100900 | ND |
| 2020-07-22 | CA2710851_004_004-202007221010 | ND |
| 2020-10-06 | CA2710851_004_004-202010060937 | ND |
| 2021-01-05 | CA2710851_002_002-202101050800 | ND |
| 2021-04-06 | CA2710851_002_002-202104060843 | ND |
| 2023-07-31 | CA2710851_004_004-202307311530 | ND |