Diquat
Makawao
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 | ND | 8 | 0 | ND |
2015 | N/A | 0 | 0 | N/A |
2016 | N/A | 0 | 0 | N/A |
2017 | ND | 8 | 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 |
---|---|---|
2014-03-17 | 201403190885 | ND |
2014-03-17 | 201403190888 | ND |
2014-03-17 | 201403190889 | ND |
2014-03-18 | 201403200528 | ND |
2014-04-29 | 201405010562 | ND |
2014-04-29 | 201405010616 | ND |
2014-04-29 | 201405010665 | ND |
2014-05-01 | 201405050006 | ND |
2017-01-27 | ND | |
2017-01-31 | ND | |
2017-01-31 | ND | |
2017-01-31 | ND | |
2017-09-07 | ND | |
2017-10-25 | ND | |
2017-10-25 | ND | |
2017-10-25 | ND |