Diquat
Natchitoches 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 | 2 | 0 | ND |
2015 | ND | 4 | 0 | ND |
2016 | ND | 4 | 0 | ND |
2017 | ND | 4 | 0 | ND |
2018 | ND | 4 | 0 | ND |
2019 | ND | 6 | 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 |
---|---|---|
2014-04-14 | AD90602 | ND |
2014-04-14 | AD90602 | ND |
2015-03-09 | 35178883003 | ND |
2015-03-09 | 35178883003 | ND |
2015-10-12 | 35211703003 | ND |
2015-10-12 | 35211703003 | ND |
2016-04-12 | 35239164010 | ND |
2016-04-12 | 35239164010 | ND |
2016-11-21 | 35279123004 | ND |
2016-11-21 | 35279123004 | ND |
2017-04-10 | 35306447004 | ND |
2017-04-10 | 35306447004 | ND |
2017-10-23 | 35344156001 | ND |
2017-10-23 | 35344156001 | ND |
2018-01-22 | 35370029001 | ND |
2018-01-22 | 35370029001 | ND |
2018-07-31 | 35408508001 | ND |
2018-07-31 | 35408508001 | ND |
2019-02-25 | 35450970001 | ND |
2019-02-25 | 35450970001 | ND |
2019-08-07 | 35488971001 | ND |
2019-08-07 | 35488971001 | ND |
2019-09-04 | 35495454001 | ND |
2019-09-04 | 35495454001 | ND |