Diquat
Arizona Water Company - Pinal Valley
Diquat is a herbicide used on potato crops and aquatic weeds.
46
Samples
0
Samples exceeding legal limit (MCL)
0
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2013 | N/A | 0 | 0 | N/A |
| 2014 | ND | 21 | 0 | ND |
| 2015 | ND | 1 | 0 | ND |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | ND | 24 | 0 | ND |
| 2018 | N/A | 0 | 0 | N/A |
| 2019 | N/A | 0 | 0 | N/A |
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 |
|---|---|---|
| 2014-05-05 | 4050314-01S | ND |
| 2014-05-05 | 4050312-01S | ND |
| 2014-05-05 | 4050311-01S | ND |
| 2014-05-05 | 4050309-01S | ND |
| 2014-05-05 | 4050308-01S | ND |
| 2014-05-05 | 4050306-01S | ND |
| 2014-05-05 | 4050303-01S | ND |
| 2014-06-10 | 4060913-02S | ND |
| 2014-06-10 | 4060913-01S | ND |
| 2014-06-10 | 4060912-01S | ND |
| 2014-06-26 | 4062286-01 | ND |
| 2014-11-06 | 4110581-01S | ND |
| 2014-11-06 | 4110579-01S | ND |
| 2014-11-06 | 4110577-01S | ND |
| 2014-11-06 | 4110576-01S | ND |
| 2014-11-06 | 4110572-01 | ND |
| 2014-11-17 | 4111338-01 | ND |
| 2014-11-18 | 4111466-01S | ND |
| 2014-12-02 | 4120306-03 | ND |
| 2014-12-02 | 4120306-02 | ND |
| 2014-12-02 | 4120306-01 | ND |
| 2015-04-21 | 5041926-01 | ND |
| 2017-03-13 | 7031063-01S | ND |
| 2017-05-03 | 7050545-01SOC | ND |
| 2017-05-03 | 7050544-01SOC | ND |
| 2017-05-03 | 7050541-01SOC | ND |
| 2017-05-04 | 7050621-01SOC | ND |
| 2017-05-04 | 7050624-01SOC | ND |
| 2017-05-04 | 7050626-01SOC | ND |
| 2017-05-04 | 7050629-01SOC | ND |
| 2017-05-04 | 7050632-01SOC | ND |
| 2017-05-04 | 7050636-01SOC | ND |
| 2017-05-04 | 7050640-01SOC | ND |
| 2017-05-04 | 7050644-01 | ND |
| 2017-08-16 | 7081780-01 SOC | ND |
| 2017-10-25 | 7102493-01SOC | ND |
| 2017-10-30 | 7102855-01SOC | ND |
| 2017-10-30 | 7102853-01SOC | ND |
| 2017-10-30 | 7102843-01SOC | ND |
| 2017-10-31 | 7102970-01SOC | ND |
| 2017-10-31 | 7110135-01SOC | ND |
| 2017-10-31 | 7110133-01SOC | ND |
| 2017-10-31 | 7110130-01SOC | ND |
| 2017-10-31 | 7102976-01SOC | ND |
| 2017-10-31 | 7102975-01SOC | ND |
| 2017-10-31 | 7102973-01SOC | ND |