Diquat
Franklin Water Supply
Diquat is a herbicide used on potato crops and aquatic weeds.
15
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 | 4 | 0 | ND |
| 2019 | ND | 2 | 0 | ND |
| 2020 | ND | 2 | 0 | ND |
| 2021 | ND | 2 | 0 | ND |
| 2022 | ND | 3 | 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 |
|---|---|---|
| 2018-01-25 | 35370415004 | ND |
| 2018-01-25 | 35370415004 | ND |
| 2018-07-09 | 35403036001 | ND |
| 2018-07-09 | 35403036001 | ND |
| 2019-01-15 | 35442684001 | ND |
| 2019-01-15 | 35442684001 | ND |
| 2020-01-07 | 35522561001 | ND |
| 2020-09-28 | 35581275001 | ND |
| 2021-02-11 | 35611668001 | ND |
| 2021-11-30 | 35680898001 | ND |
| 2022-01-06 | 35688910 001 | ND |
| 2022-01-06 | 35688910001 | ND |
| 2022-07-28 | 35735504001 | ND |
| 2023-01-30 | 35776509001 | ND |
| 2023-10-09 | 35833396001 | ND |