Diquat
Canada Woods Water Company
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 | 1 | 0 | ND |
2015 | ND | 4 | 0 | ND |
2016 | ND | 2 | 0 | ND |
2017 | N/A | 0 | 0 | N/A |
2018 | ND | 3 | 0 | ND |
2019 | ND | 4 | 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 |
---|---|---|
2014-07-21 | 5810-028-1030 | ND |
2015-03-30 | 5810-012-1200 | ND |
2015-12-09 | 5810-001-1130 | ND |
2015-12-09 | 5810-002-1145 | ND |
2015-12-09 | 5810-010-1030 | ND |
2016-03-24 | 5810-027-1000 | ND |
2016-06-27 | 5867-027-1125 | ND |
2018-04-06 | 5810-008-1110 | ND |
2018-04-06 | 5810-028-1050 | ND |
2018-04-06 | 5810-029-1010 | ND |
2019-03-28 | 5810-027-1216 | ND |
2019-08-27 | 5810-001-1122 | ND |
2019-08-27 | 5810-002-1134 | ND |
2019-12-26 | 5810-010-0906 | ND |