Diquat
Three Valleys Municipal Water 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 | 3 | 0 | ND |
2015 | ND | 2 | 0 | ND |
2016 | ND | 5 | 0 | ND |
2017 | ND | 4 | 0 | ND |
2018 | ND | 2 | 0 | ND |
2019 | ND | 1 | 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 |
---|---|---|
2014-02-18 | 9588-002-0800 | ND |
2014-06-10 | 9588-004-1030 | ND |
2014-09-16 | 9588-004-1101 | ND |
2015-03-10 | 5867-002-0930 | ND |
2015-06-09 | 9588-004-0940 | ND |
2016-03-15 | 3761-002-0900 | ND |
2016-06-21 | 3761-004-1006 | ND |
2016-06-21 | 3761-002-1030 | ND |
2016-09-13 | 3761-002-1000 | ND |
2016-12-13 | 3761-002-1020 | ND |
2017-03-21 | 3761-004-1040 | ND |
2017-06-21 | 3761-002-1000 | ND |
2017-06-21 | 3761-004-1100 | ND |
2017-09-12 | 3761-002-0900 | ND |
2018-06-12 | 3761-004-0000 | ND |
2018-09-11 | 3761-002-1045 | ND |
2019-09-17 | 3761-002-1005 | ND |