Diquat
Alameda County Water District
Diquat is a herbicide used on potato crops and aquatic weeds.
25
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 | ND | 5 | 0 | ND |
| 2015 | ND | 4 | 0 | ND |
| 2016 | ND | 4 | 0 | ND |
| 2017 | ND | 4 | 0 | ND |
| 2018 | ND | 4 | 0 | ND |
| 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 |
|---|---|---|
| 2014-05-27 | 9590-015-1020 | ND |
| 2014-07-21 | 9590-041-0955 | ND |
| 2014-07-21 | 9590-038-0955 | ND |
| 2014-07-22 | 9590-053-0905 | ND |
| 2014-07-22 | 9590-040-0925 | ND |
| 2015-07-06 | 9590-038-1000 | ND |
| 2015-07-06 | 9590-040-1105 | ND |
| 2015-07-06 | 9590-041-0921 | ND |
| 2015-07-21 | 9590-053-0905 | ND |
| 2016-07-11 | 9590-038-0850 | ND |
| 2016-07-11 | 9590-041-0820 | ND |
| 2016-07-19 | 9590-053-0955 | ND |
| 2016-07-19 | 9590-040-0825 | ND |
| 2017-07-17 | 9590-041-1005 | ND |
| 2017-07-17 | 9590-038-1030 | ND |
| 2017-07-25 | 9590-053-1032 | ND |
| 2017-07-25 | 9590-040-0915 | ND |
| 2018-07-11 | 9590-041-0755 | ND |
| 2018-07-11 | 9590-038-0726 | ND |
| 2018-07-17 | 9590-040-0850 | ND |
| 2018-07-17 | 9590-053-0845 | ND |
| 2019-04-16 | 9590-038-0800 | ND |
| 2019-04-23 | 9590-053-0745 | ND |
| 2019-04-30 | 9590-041-0905 | ND |
| 2019-06-04 | 9590-040-0815 | ND |