Diquat
Hillview Water Company-oakhurst/sierra Lakes
Diquat is a herbicide used on potato crops and aquatic weeds.
6
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 | 6 | 0 | ND |
| 2021 | N/A | 0 | 0 | N/A |
| 2022 | N/A | 0 | 0 | N/A |
| 2023 | N/A | 0 | 0 | N/A |
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 |
|---|---|---|
| 2020-12-09 | CA2010007_017_017-202012091258 | ND |
| 2020-12-09 | CA2010007_034_034-202012091158 | ND |
| 2020-12-10 | CA2010007_030_030-202012101120 | ND |
| 2020-12-10 | CA2010007_033_033-202012101725 | ND |
| 2020-12-10 | CA2010007_032_032-202012101705 | ND |
| 2020-12-10 | CA2010007_031_031-202012101648 | ND |