Diquat
Calhoun County Water and Fire Protection Authority
Diquat is a herbicide used on potato crops and aquatic weeds.
18
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 |
|---|---|---|---|---|
| 2014 | ND | 4 | 0 | ND |
| 2015 | ND | 2 | 0 | ND |
| 2016 | ND | 1 | 0 | ND |
| 2017 | ND | 9 | 0 | ND |
| 2018 | ND | 2 | 0 | ND |
| 2019 | N/A | 0 | 0 | N/A |
ppb = parts per billion
State and national drinking water standards and health guidelines
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 |
|---|---|---|
| 2014-06-25 | 140625053-2 | ND |
| 2014-06-25 | 140625053-3 | ND |
| 2014-06-25 | 140625053-1 | ND |
| 2014-09-25 | 140925025-1 | ND |
| 2015-02-17 | 150218002-1 | ND |
| 2015-11-16 | 151116034-1 | ND |
| 2016-12-01 | 161201073-1 | ND |
| 2017-02-22 | 170222064-3 | ND |
| 2017-02-22 | 170222064-2 | ND |
| 2017-02-22 | 170222064-1 | ND |
| 2017-03-09 | 170309036-1 | ND |
| 2017-06-05 | 170605052-3 | ND |
| 2017-06-05 | 170605052-1 | ND |
| 2017-06-05 | 170605052-2 | ND |
| 2017-06-05 | 170605052-4 | ND |
| 2017-08-08 | 170808021-001 | ND |
| 2018-02-22 | 180222037-1 | ND |
| 2018-05-21 | 180521037-1 | ND |