Diquat
Blanchard Water System
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 | 4 | 0 | ND |
2017 | ND | 4 | 0 | ND |
2018 | ND | 2 | 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 |
---|---|---|
2014-04-07 | AD90458 | ND |
2014-04-07 | AD90458 | ND |
2015-03-23 | 35181011004 | ND |
2015-03-23 | 35181011004 | ND |
2015-10-19 | 35212906004 | ND |
2015-10-19 | 35212906004 | ND |
2016-05-02 | 35242556004 | ND |
2016-05-02 | 35242556004 | ND |
2016-12-08 | 35282332005 | ND |
2016-12-08 | 35282332005 | ND |
2017-04-17 | 35307223002 | ND |
2017-04-17 | 35307223002 | ND |
2017-12-13 | 35363594001 | ND |
2017-12-13 | 35363594001 | ND |
2018-01-08 | 35367511001 | ND |
2018-01-08 | 35367511001 | ND |
2019-02-18 | 35449623001 | ND |
2019-02-18 | 35449623001 | ND |
2019-07-25 | 35485233001 | ND |
2019-07-25 | 35485233001 | ND |