Diquat
City of Lexington
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 |
|---|---|---|---|---|
| 2014 | N/A | 0 | 0 | N/A |
| 2015 | ND | 4 | 0 | ND |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | ND | 4 | 0 | ND |
| 2019 | ND | 7 | 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 |
|---|---|---|
| 2015-04-20 | 357165 | ND |
| 2015-04-20 | 357166 | ND |
| 2015-07-13 | 375234 | ND |
| 2015-07-13 | 375235 | ND |
| 2018-04-16 | 546122 | ND |
| 2018-04-16 | 546123 | ND |
| 2018-09-17 | 561377 | ND |
| 2018-09-17 | 561378 | ND |
| 2019-02-19 | 592170 | ND |
| 2019-02-19 | 592171 | ND |
| 2019-02-19 | 592172 | ND |
| 2019-02-19 | 592173 | ND |
| 2019-02-19 | 592174 | ND |
| 2019-02-19 | 592175 | ND |
| 2019-02-19 | 592176 | ND |