Diquat
Frankfort
Diquat is a herbicide used on potato crops and aquatic weeds.
12
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 | N/A | 0 | 0 | N/A |
| 2015 | ND | 2 | 0 | ND |
| 2016 | ND | 4 | 0 | ND |
| 2017 | ND | 1 | 0 | ND |
| 2018 | ND | 5 | 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 |
|---|---|---|
| 2015-08-18 | 1508E42-003A | ND |
| 2015-11-17 | 1511D02-003A | ND |
| 2016-02-16 | 1602A55-002A | ND |
| 2016-04-18 | 1604D34-003A | ND |
| 2016-08-16 | 1608E42-003A | ND |
| 2016-10-17 | 1610D06-002A | ND |
| 2017-01-17 | 1701903-003A | ND |
| 2018-02-05 | 1802380-001E | ND |
| 2018-05-23 | 1805I66-003A | ND |
| 2018-07-16 | 1807B08-001E | ND |
| 2018-11-28 | 1811J20-002B | ND |
| 2018-11-29 | 1811J64-001E | ND |