Diquat
Lee County Utilities
Diquat is a herbicide used on potato crops and aquatic weeds.
26
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 | 10 | 0 | ND |
| 2015 | N/A | 0 | 0 | N/A |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | ND | 11 | 0 | ND |
| 2018 | ND | 3 | 0 | ND |
| 2019 | 0.200 ppb | 2 | 1 | ND - 0.400 ppb |
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 |
|---|---|
| 2014-03-06 | ND |
| 2014-03-06 | ND |
| 2014-03-24 | ND |
| 2014-03-24 | ND |
| 2014-05-29 | ND |
| 2014-09-09 | ND |
| 2014-09-09 | ND |
| 2014-09-10 | ND |
| 2014-09-10 | ND |
| 2014-11-17 | ND |
| 2017-03-01 | ND |
| 2017-03-01 | ND |
| 2017-03-02 | ND |
| 2017-03-02 | ND |
| 2017-03-02 | ND |
| 2017-09-22 | ND |
| 2017-09-22 | ND |
| 2017-09-22 | ND |
| 2017-09-22 | ND |
| 2017-09-22 | ND |
| 2017-11-02 | ND |
| 2018-06-11 | ND |
| 2018-07-09 | ND |
| 2018-10-01 | ND |
| 2019-01-07 | 0.400 ppb |
| 2019-07-01 | ND |