Diquat
Auburn Water Works
Diquat is a herbicide used on potato crops and aquatic weeds.
12
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 | 4 | 0 | ND |
| 2015 | ND | 4 | 0 | ND |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | N/A | 0 | 0 | N/A |
| 2019 | ND | 4 | 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 |
|---|---|---|
| 2014-03-04 | 80403042014-5 | ND |
| 2014-06-04 | 80406042014-1 | ND |
| 2014-08-19 | 80408192014-2 | ND |
| 2014-10-16 | 80410162014-1S | ND |
| 2015-03-18 | 80403182015-4 | ND |
| 2015-05-20 | 80405202015-1 | ND |
| 2015-09-03 | 80409032015-2 | ND |
| 2015-10-21 | 80410212015-1S | ND |
| 2019-03-19 | 188578-01SOC | ND |
| 2019-03-19 | 188577-01SOC | ND |
| 2019-09-18 | 195598-01SOC | ND |
| 2019-09-18 | 195597-01SOC | ND |