Diquat
United Water Cons District
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 | 2 | 0 | ND |
2015 | ND | 4 | 0 | ND |
2016 | ND | 2 | 0 | ND |
2017 | ND | 1 | 0 | ND |
2018 | ND | 2 | 0 | ND |
2019 | ND | 3 | 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 |
---|---|---|
2014-08-13 | 5867-008-0810 | ND |
2014-08-13 | 5867-013-0900 | ND |
2015-02-17 | 5867-026-0905 | ND |
2015-08-12 | 5867-004-0716 | ND |
2015-08-12 | 5867-007-0736 | ND |
2015-08-12 | 5867-010-0830 | ND |
2016-08-11 | 5867-017-0752 | ND |
2016-08-11 | 5867-026-0732 | ND |
2017-08-09 | 5867-008-0806 | ND |
2018-08-08 | 5867-004-0820 | ND |
2018-08-08 | 5867-007-0849 | ND |
2019-08-14 | 5867-013-0855 | ND |
2019-08-14 | 5867-017-0925 | ND |
2019-08-14 | 5867-027-0915 | ND |