Diquat
Thibodaux Waterworks
Diquat is a herbicide used on potato crops and aquatic weeds.
16
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 | 4 | 0 | ND |
| 2020 | ND | 2 | 0 | ND |
| 2021 | ND | 2 | 0 | ND |
| 2022 | ND | 2 | 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 | 35370415010 | ND |
| 2018-01-25 | 35370415010 | ND |
| 2018-07-23 | 35406292001 | ND |
| 2018-07-23 | 35406292001 | ND |
| 2019-01-29 | 35445087001 | ND |
| 2019-01-29 | 35445087001 | ND |
| 2019-07-24 | 35484852001 | ND |
| 2019-07-24 | 35484852001 | ND |
| 2020-01-22 | 35526014001 | ND |
| 2020-10-15 | 35585521001 | ND |
| 2021-03-11 | 35619284001 | ND |
| 2021-11-04 | 35675780001 | ND |
| 2022-02-10 | 35696479001EF | ND |
| 2022-08-25 | 35742733001 | ND |
| 2023-02-27 | 35782421001 | ND |
| 2023-10-23 | 35836722001 | ND |