Diquat
Parker WSD
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 | ND | 32 | 0 | ND |
2016 | ND | 8 | 0 | ND |
2017 | ND | 6 | 0 | ND |
2018 | N/A | 0 | 0 | N/A |
2019 | ND | 17 | 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 | Result |
---|---|
2014-07-21 | ND |
2014-07-24 | ND |
2015-03-19 | ND |
2015-03-26 | ND |
2015-03-30 | ND |
2015-04-15 | ND |
2015-04-15 | ND |
2015-04-27 | ND |
2015-05-21 | ND |
2015-05-21 | ND |
2015-06-10 | ND |
2015-06-10 | ND |
2015-06-16 | ND |
2015-06-17 | ND |
2015-06-17 | ND |
2015-06-24 | ND |
2015-06-24 | ND |
2015-07-29 | ND |
2015-08-13 | ND |
2015-08-13 | ND |
2015-08-20 | ND |
2015-08-20 | ND |
2015-08-20 | ND |
2015-08-26 | ND |
2015-09-01 | ND |
2015-09-01 | ND |
2015-09-01 | ND |
2015-09-03 | ND |
2015-09-10 | ND |
2015-09-15 | ND |
2015-09-15 | ND |
2015-09-15 | ND |
2015-09-16 | ND |
2015-10-21 | ND |
2016-01-28 | ND |
2016-05-03 | ND |
2016-07-14 | ND |
2016-07-18 | ND |
2016-07-28 | ND |
2016-10-04 | ND |
2016-10-18 | ND |
2016-10-18 | ND |
2017-06-08 | ND |
2017-07-18 | ND |
2017-07-24 | ND |
2017-07-26 | ND |
2017-07-31 | ND |
2017-10-23 | ND |
2019-04-16 | ND |
2019-04-16 | ND |
2019-04-17 | ND |
2019-04-22 | ND |
2019-04-23 | ND |
2019-04-24 | ND |
2019-04-25 | ND |
2019-04-25 | ND |
2019-08-26 | ND |
2019-08-27 | ND |
2019-08-29 | ND |
2019-08-29 | ND |
2019-09-05 | ND |
2019-09-16 | ND |
2019-09-23 | ND |
2019-09-25 | ND |
2019-10-02 | ND |