Diquat
Woodbury
Diquat is a herbicide used on potato crops and aquatic weeds.
32
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 | N/A | 0 | 0 | N/A |
| 2021 | ND | 16 | 0 | ND |
| 2022 | ND | 14 | 0 | ND |
| 2023 | ND | 2 | 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 |
|---|---|---|
| 2021-08-18 | 4990523 | ND |
| 2021-08-18 | 4990521 | ND |
| 2021-08-18 | 4990519 | ND |
| 2021-08-18 | 4990535 | ND |
| 2021-08-18 | 4990537 | ND |
| 2021-08-18 | 4990539 | ND |
| 2021-08-18 | 4990556 | ND |
| 2021-11-16 | 7789-2 | ND |
| 2021-11-16 | 7789-1 | ND |
| 2021-11-16 | 7789-3 | ND |
| 2021-11-16 | 7789-4 | ND |
| 2021-11-16 | 7789-5 | ND |
| 2021-11-16 | 7789-6 | ND |
| 2021-11-16 | 7789-7 | ND |
| 2021-11-16 | 7789-8 | ND |
| 2021-11-16 | 7789-9 | ND |
| 2022-02-14 | 14920-2 | ND |
| 2022-02-14 | 14930-3 | ND |
| 2022-02-14 | 14930-2 | ND |
| 2022-02-14 | 14930-1 | ND |
| 2022-02-14 | 14920-4 | ND |
| 2022-02-14 | 14920-3 | ND |
| 2022-02-14 | 14920-1 | ND |
| 2022-05-05 | 23869-7 | ND |
| 2022-05-05 | 23869-6 | ND |
| 2022-05-05 | 23869-5 | ND |
| 2022-05-05 | 23869-4 | ND |
| 2022-05-05 | 23869-3 | ND |
| 2022-05-05 | 23869-2 | ND |
| 2022-05-05 | 23869-1 | ND |
| 2023-09-19 | 78216-1 | ND |
| 2023-12-20 | 88916-1 | ND |