Diquat
Florence Water-Wastewater Department
Diquat is a herbicide used on potato crops and aquatic weeds.
24
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 | 8 | 0 | ND |
| 2015 | ND | 2 | 0 | ND |
| 2016 | ND | 2 | 0 | ND |
| 2017 | ND | 8 | 0 | ND |
| 2018 | ND | 2 | 0 | ND |
| 2019 | ND | 2 | 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 |
|---|---|---|
| 2014-02-14 | 140214093-1 | ND |
| 2014-05-30 | 140530024-2 | ND |
| 2014-05-30 | 140530024-1 | ND |
| 2014-05-30 | 140530024-3 | ND |
| 2014-06-26 | 140626039-1 | ND |
| 2014-08-11 | 140812013-2 | ND |
| 2014-08-11 | 140812013-3 | ND |
| 2014-08-11 | 140812013-1 | ND |
| 2015-05-12 | 150512045-2 | ND |
| 2015-05-12 | 150512045-1 | ND |
| 2016-05-09 | 160510008-1 | ND |
| 2016-05-09 | 160510008-2 | ND |
| 2017-02-21 | 170221017-1 | ND |
| 2017-06-08 | 170609002-1 | ND |
| 2017-06-08 | 170609002-4 | ND |
| 2017-06-08 | 170609002-3 | ND |
| 2017-06-08 | 170609002-2 | ND |
| 2017-08-01 | 170801069-3 | ND |
| 2017-08-01 | 170801069-2 | ND |
| 2017-08-01 | 170801069-1 | ND |
| 2018-05-14 | 180515028-1 | ND |
| 2018-05-15 | 180515028-2 | ND |
| 2019-05-14 | 19050485-001 | ND |
| 2019-07-16 | 20112933001_ISOC | ND |