Diquat
Great Waters At Reynolds Plantation
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 |
|---|---|---|---|---|
| 2014 | ND | 3 | 0 | ND |
| 2015 | ND | 9 | 0 | ND |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | ND | 4 | 0 | ND |
| 2018 | N/A | 0 | 0 | N/A |
| 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 |
|---|---|---|
| 2014-12-15 | AI61690 | ND |
| 2014-12-15 | AI61706 | ND |
| 2014-12-15 | AI61709 | ND |
| 2015-01-12 | AI62715 | ND |
| 2015-01-12 | AI62730 | ND |
| 2015-01-12 | AI62732 | ND |
| 2015-04-13 | AI74731 | ND |
| 2015-04-13 | AI74735 | ND |
| 2015-04-13 | AI74737 | ND |
| 2015-07-15 | AI83036 | ND |
| 2015-07-15 | AI83041 | ND |
| 2015-07-15 | AI83043 | ND |
| 2017-01-10 | AJ37942 | ND |
| 2017-04-04 | AJ52723 | ND |
| 2017-07-11 | AJ59988 | ND |
| 2017-10-09 | AJ71123 | ND |