Diquat
Pennsylvania American Royersford
Diquat is a herbicide used on potato crops and aquatic weeds.
20
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 | 10 | 0 | ND |
| 2015 | N/A | 0 | 0 | N/A |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | ND | 10 | 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 |
|---|---|---|
| 2014-04-02 | 25339901 | ND |
| 2014-04-02 | 25340101 | ND |
| 2014-04-03 | 25339801 | ND |
| 2014-04-03 | 25340201 | ND |
| 2014-06-25 | 25340401 | ND |
| 2014-08-05 | 26516601 | ND |
| 2014-08-05 | 26516201 | ND |
| 2014-08-06 | 26516401 | ND |
| 2014-08-06 | 26516701 | ND |
| 2014-08-12 | 26516501 | ND |
| 2017-04-11 | 15931559 | ND |
| 2017-04-11 | 15931529 | ND |
| 2017-04-11 | 15931501 | ND |
| 2017-04-11 | 15931473 | ND |
| 2017-04-11 | 15931445 | ND |
| 2017-08-15 | 16560835 | ND |
| 2017-08-15 | 16560863 | ND |
| 2017-08-15 | 16560807 | ND |
| 2017-08-16 | 16560891 | ND |
| 2017-08-31 | 16721946 | ND |