Diquat
Grand Prairie Bayou 2 PWA
Diquat is a herbicide used on potato crops and aquatic weeds.
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 | 2 | 0 | ND |
2017 | N/A | 0 | 0 | N/A |
2018 | ND | 2 | 0 | ND |
2019 | ND | 3 | 0 | ND |
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 |
---|---|---|
2015-05-06 | 15127013508 | ND |
2015-07-21 | 15204006108 | ND |
2016-08-16 | 16230003507 | ND |
2016-10-10 | 16287007107 | ND |
2018-05-22 | 18144004008 | ND |
2018-08-14 | 18228000308 | ND |
2019-03-13 | 4226422 | ND |
2019-07-17 | 19199004208 | ND |
2019-10-02 | 19277006208 | ND |