Diquat
Lafourche Water District 1
Diquat is a herbicide used on potato crops and aquatic weeds.
31
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 | 8 | 0 | ND |
| 2019 | ND | 8 | 0 | ND |
| 2020 | ND | 4 | 0 | ND |
| 2021 | ND | 4 | 0 | ND |
| 2022 | ND | 3 | 0 | ND |
| 2023 | ND | 4 | 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 | 35370415009 | ND |
| 2018-01-25 | 35370415009 | ND |
| 2018-05-14 | 35392324001 | ND |
| 2018-05-14 | 35392324002 | ND |
| 2018-05-14 | 35392324002 | ND |
| 2018-05-14 | 35392324001 | ND |
| 2018-07-23 | 35406305001 | ND |
| 2018-07-23 | 35406305001 | ND |
| 2019-01-29 | 35445082001 | ND |
| 2019-01-29 | 35445082001 | ND |
| 2019-02-18 | 35449374001 | ND |
| 2019-02-18 | 35449374001 | ND |
| 2019-07-24 | 35484855001 | ND |
| 2019-07-24 | 35484855001 | ND |
| 2019-08-28 | 35494052001 | ND |
| 2019-08-28 | 35494052001 | ND |
| 2020-01-22 | 35526013001 | ND |
| 2020-01-22 | 35526013002 | ND |
| 2020-10-15 | 35585520001 | ND |
| 2020-12-03 | 35596468001 | ND |
| 2021-03-11 | 35619276001 | ND |
| 2021-03-11 | 35619285001 | ND |
| 2021-11-04 | 35675774001 | ND |
| 2021-12-16 | 35685695001 | ND |
| 2022-03-02 | 35701429001 | ND |
| 2022-08-25 | 35742731001 | ND |
| 2022-10-12 | 35753130001 | ND |
| 2023-02-27 | 35782418001 | ND |
| 2023-03-27 | 35789305001 | ND |
| 2023-10-23 | 35836721001 | ND |
| 2023-12-14 | 35848533001 | ND |