Diquat
Lahaina
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 | 8 | 0 | ND |
2015 | N/A | 0 | 0 | N/A |
2016 | ND | 2 | 0 | ND |
2017 | ND | 10 | 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 |
---|---|---|
2014-04-03 | 201404080935 | ND |
2014-04-03 | 201404080617 | ND |
2014-04-04 | 201404080992 | ND |
2014-04-11 | 201404150350 | ND |
2014-09-10 | 201409120763 | ND |
2014-09-10 | 201409120765 | ND |
2014-09-10 | 201409120770 | ND |
2014-09-10 | 201409120773 | ND |
2016-09-26 | ND | |
2016-11-28 | ND | |
2017-01-30 | ND | |
2017-01-30 | ND | |
2017-01-30 | ND | |
2017-01-30 | ND | |
2017-01-30 | ND | |
2017-09-07 | ND | |
2017-09-07 | ND | |
2017-09-07 | ND | |
2017-10-30 | ND | |
2017-10-30 | ND |