Diquat
Marion Waterworks
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 | N/A | 0 | 0 | N/A |
2015 | ND | 6 | 0 | ND |
2016 | N/A | 0 | 0 | N/A |
2017 | ND | 1 | 0 | ND |
2018 | ND | 9 | 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 |
---|---|---|
2015-09-16 | 15260000408 | ND |
2015-09-16 | 15260000308 | ND |
2015-09-16 | 15260000508 | ND |
2015-11-19 | 15324001608 | ND |
2015-11-19 | 15324001708 | ND |
2015-11-19 | 15324001908 | ND |
2017-12-06 | 17341002008 | ND |
2018-01-18 | 18019004209 | ND |
2018-04-10 | 18101008308 | ND |
2018-08-15 | 18228001108 | ND |
2018-08-15 | 18228001208 | ND |
2018-08-15 | 18228001408 | ND |
2018-08-15 | 18228001308 | ND |
2018-10-15 | 18291006308 | ND |
2018-10-15 | 18291006408 | ND |
2018-10-15 | 18291006208 | ND |