Diquat
City of Denham Springs Water System
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 |
---|---|---|---|---|
2013 | N/A | 0 | 0 | N/A |
2014 | ND | 14 | 0 | ND |
2015 | ND | 2 | 0 | ND |
2016 | N/A | 0 | 0 | N/A |
2017 | ND | 10 | 0 | ND |
2018 | ND | 2 | 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 |
---|---|---|
2014-06-17 | AD92288 | ND |
2014-06-17 | AD92286 | ND |
2014-06-17 | AD92285 | ND |
2014-06-17 | AD92287 | ND |
2014-06-17 | AD92288 | ND |
2014-06-17 | AD92289 | ND |
2014-06-17 | AD92287 | ND |
2014-06-17 | AD92286 | ND |
2014-06-17 | AD92285 | ND |
2014-06-17 | AD92289 | ND |
2014-06-24 | AD92626 | ND |
2014-06-24 | AD92626 | ND |
2014-12-08 | AE00303 | ND |
2014-12-08 | AE00303 | ND |
2015-09-16 | 35207899001 | ND |
2015-09-16 | 35207899001 | ND |
2017-07-17 | 35325021004 | ND |
2017-07-17 | 35325021003 | ND |
2017-07-17 | 35325021002 | ND |
2017-07-17 | 35325021001 | ND |
2017-07-17 | 35325021002 | ND |
2017-07-17 | 35325021003 | ND |
2017-07-17 | 35325021004 | ND |
2017-07-17 | 35325021001 | ND |
2017-09-25 | 35338791003 | ND |
2017-09-25 | 35338791003 | ND |
2018-01-29 | 35371221001 | ND |
2018-01-29 | 35371221001 | ND |