Diquat
Aqua Pennsylvania Main System
Diquat is a herbicide used on potato crops and aquatic weeds.
29
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 |
|---|---|---|---|---|
| 2013 | N/A | 0 | 0 | N/A |
| 2014 | ND | 15 | 0 | ND |
| 2015 | N/A | 0 | 0 | N/A |
| 2016 | ND | 1 | 0 | ND |
| 2017 | ND | 13 | 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 |
|---|---|---|
| 2014-02-26 | 1073772001 | ND |
| 2014-04-23 | 2003543001 | ND |
| 2014-04-23 | 2003544001 | ND |
| 2014-04-23 | 2003542001 | ND |
| 2014-04-23 | 2003541001 | ND |
| 2014-04-28 | 2004650001 | ND |
| 2014-04-29 | 2004652001 | ND |
| 2014-04-29 | 2004651001 | ND |
| 2014-07-21 | 2019295001 | ND |
| 2014-07-21 | 2019297001 | ND |
| 2014-07-22 | 2019998001 | ND |
| 2014-07-23 | 2019999001 | ND |
| 2014-07-23 | 2020000001 | ND |
| 2014-07-24 | 2020242001 | ND |
| 2014-07-24 | 2020244001 | ND |
| 2016-08-11 | 14739510 | ND |
| 2017-05-15 | 16098298 | ND |
| 2017-05-15 | 16098317 | ND |
| 2017-05-15 | 16098279 | ND |
| 2017-05-17 | 16098373 | ND |
| 2017-05-17 | 16098345 | ND |
| 2017-05-17 | 16098401 | ND |
| 2017-05-25 | 16099734 | ND |
| 2017-08-14 | 16569950 | ND |
| 2017-08-14 | 16569894 | ND |
| 2017-08-15 | 16569922 | ND |
| 2017-08-16 | 16571248 | ND |
| 2017-08-16 | 16571219 | ND |
| 2017-08-16 | 16571277 | ND |