Diquat
Liberty Water Rio Rico
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 | N/A | 0 | 0 | N/A |
2015 | N/A | 0 | 0 | N/A |
2016 | ND | 12 | 0 | ND |
2017 | N/A | 0 | 0 | N/A |
2018 | N/A | 0 | 0 | N/A |
2019 | ND | 12 | 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 |
---|---|---|
2016-05-18 | 3453953 | ND |
2016-05-18 | 3453947 | ND |
2016-05-18 | 3453941 | ND |
2016-05-18 | 3453935 | ND |
2016-06-27 | 3479517 | ND |
2016-06-27 | 3479511 | ND |
2016-08-23 | 3530512 | ND |
2016-08-23 | 3530542 | ND |
2016-08-23 | 3530536 | ND |
2016-08-23 | 3530530 | ND |
2016-08-23 | 3530524 | ND |
2016-08-23 | 3530518 | ND |
2019-04-09 | 4257188 | ND |
2019-04-09 | 4257182 | ND |
2019-04-09 | 4257176 | ND |
2019-04-09 | 4257170 | ND |
2019-04-09 | 4257164 | ND |
2019-04-09 | 4257158 | ND |
2019-08-12 | 4386017 | ND |
2019-08-12 | 4386061 | ND |
2019-08-12 | 4386055 | ND |
2019-08-12 | 4386049 | ND |
2019-08-12 | 4386029 | ND |
2019-08-12 | 4386023 | ND |