Diquat
Water District 1 of Johnson County
Diquat is a herbicide used on potato crops and aquatic weeds.
15
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 | 3 | 0 | ND |
| 2015 | ND | 3 | 0 | ND |
| 2016 | ND | 3 | 0 | ND |
| 2017 | ND | 3 | 0 | ND |
| 2018 | ND | 3 | 0 | ND |
| 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 |
|---|---|---|
| 2014-05-07 | MAY2014-OC-TP1 | ND |
| 2014-05-07 | MAY2014-OC-TP2 | ND |
| 2014-05-07 | MAY2014-OC-TP3 | ND |
| 2015-05-19 | MAY2015-SOC-TP1 | ND |
| 2015-05-19 | MAY2015-SOC-TP2 | ND |
| 2015-05-19 | MAY2015-SOC-TP3 | ND |
| 2016-05-17 | MAY2016--TP2 | ND |
| 2016-05-17 | MAY2016--TP3 | ND |
| 2016-06-20 | JUN2016--TP1 | ND |
| 2017-05-16 | MAY2017--TP2 EUR | ND |
| 2017-05-16 | MAY2017--TP3 EUR | ND |
| 2017-07-12 | JUL2017--TP1 EUR | ND |
| 2018-05-01 | MAY2018--TP3 SOC | ND |
| 2018-05-17 | MAY2018--TP1 PAC | ND |
| 2018-05-17 | MAY2018--TP1 PAC | ND |