Diquat
Cal-water Service Company - Chico
Diquat is a herbicide used on potato crops and aquatic weeds.
18
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 | 2 | 0 | ND |
| 2015 | ND | 1 | 0 | ND |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | ND | 13 | 0 | ND |
| 2018 | ND | 2 | 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 |
|---|---|---|
| 2014-01-14 | 5810-140-1244 | ND |
| 2014-04-23 | 5810-140-0910 | ND |
| 2015-07-14 | 5810-052-0700 | ND |
| 2017-08-08 | 9590-017-1144 | ND |
| 2017-08-08 | 9590-064-1022 | ND |
| 2017-08-08 | 9590-062-0950 | ND |
| 2017-08-08 | 9590-032-0857 | ND |
| 2017-08-08 | 9590-007-0758 | ND |
| 2017-08-09 | 9590-054-0941 | ND |
| 2017-08-09 | 9590-059-0722 | ND |
| 2017-08-10 | 9590-063-0807 | ND |
| 2017-08-10 | 9590-074-1017 | ND |
| 2017-08-14 | 9590-049-1326 | ND |
| 2017-08-14 | 9590-075-1319 | ND |
| 2017-08-15 | 9590-041-0745 | ND |
| 2017-08-15 | 9590-038-1154 | ND |
| 2018-06-18 | 9590-036-1020 | ND |
| 2018-06-18 | 9590-031-0856 | ND |