Diquat
City of Prescott
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 | 7 | 0 | ND |
2015 | ND | 5 | 0 | ND |
2016 | ND | 4 | 0 | ND |
2017 | ND | 4 | 0 | ND |
2018 | ND | 5 | 0 | ND |
2019 | ND | 3 | 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 |
---|---|---|
2014-01-14 | 477391-001 | ND |
2014-01-28 | 478224-001 | ND |
2014-01-28 | 478223-001 | ND |
2014-01-28 | 478222-001 | ND |
2014-02-04 | 478707-001 | ND |
2014-02-04 | 478706-001 | ND |
2014-02-04 | 478705-001 | ND |
2015-06-10 | 509223-001D | ND |
2015-07-21 | 511845-001E | ND |
2015-07-21 | 511844-001 | ND |
2015-11-19 | 519827-001 | ND |
2015-11-19 | 519814-001 | ND |
2016-03-17 | 526847-001B | ND |
2016-04-14 | 550-61972-1 | ND |
2016-09-15 | 550-69719-1 | ND |
2016-11-14 | 550-72946-1 | ND |
2017-01-23 | 550-76311-1 | ND |
2017-04-25 | 550-81719-2SOC | ND |
2017-07-19 | 550-86412-1 | ND |
2017-11-02 | 550-92577-1 | ND |
2018-01-22 | 550-96710-2SOC | ND |
2018-01-29 | 550-97085-1SOC | ND |
2018-04-24 | 550-101814-1 SOC | ND |
2018-05-01 | 550-102163-1 SOC | ND |
2018-12-15 | 550-115025-1 SOC | ND |
2019-02-12 | 550-117899-1 | ND |
2019-02-12 | 550-117899-3 SOC | ND |
2019-02-12 | 550-117899-2 SOC | ND |