Diquat
Marco Rural 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 |
---|---|---|---|---|
2013 | N/A | 0 | 0 | N/A |
2014 | ND | 2 | 0 | ND |
2015 | N/A | 0 | 0 | N/A |
2016 | ND | 8 | 0 | ND |
2017 | N/A | 0 | 0 | N/A |
2018 | N/A | 0 | 0 | N/A |
2019 | ND | 8 | 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 |
---|---|---|
2014-03-04 | AD36307 | ND |
2014-06-10 | AD41057 | ND |
2016-11-08 | AD85403 | ND |
2016-11-08 | AD85422 | ND |
2016-11-08 | AD85395 | ND |
2016-11-08 | AD85412 | ND |
2016-11-08 | AD85401 | ND |
2016-11-08 | AD85416 | ND |
2016-11-08 | AD85399 | ND |
2016-11-08 | AD85414 | ND |
2019-12-02 | AE40915 | ND |
2019-12-02 | AE40929 | ND |
2019-12-03 | AE41078 | ND |
2019-12-03 | AE41076 | ND |
2019-12-03 | AE41048 | ND |
2019-12-03 | AE41070 | ND |
2019-12-03 | AE41072 | ND |
2019-12-03 | AE41074 | ND |