Diquat
Daphne
Diquat is a herbicide used on potato crops and aquatic weeds.
41
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 | 5 | 0 | ND |
| 2015 | ND | 2 | 0 | ND |
| 2016 | ND | 14 | 0 | ND |
| 2017 | ND | 2 | 0 | ND |
| 2018 | ND | 4 | 0 | ND |
| 2019 | ND | 14 | 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 |
|---|---|---|
| 2014-01-13 | 140114010-1 | ND |
| 2014-01-13 | 140114010-2 | ND |
| 2014-01-13 | 140114010-3 | ND |
| 2014-04-17 | 140418028-1 | ND |
| 2014-07-14 | 140715013-1 | ND |
| 2015-01-12 | 150114119-1 | ND |
| 2015-07-16 | 150717034-1 | ND |
| 2016-01-13 | 160114023-2 | ND |
| 2016-01-13 | 160114023-4 | ND |
| 2016-01-13 | 160114023-1 | ND |
| 2016-01-13 | 160114023-3 | ND |
| 2016-04-13 | 160414034-5 | ND |
| 2016-04-13 | 160414034-4 | ND |
| 2016-04-13 | 160414034-2 | ND |
| 2016-04-13 | 160414034-3 | ND |
| 2016-04-13 | 160413097-1 | ND |
| 2016-04-13 | 160414034-6 | ND |
| 2016-04-13 | 160414034-1 | ND |
| 2016-07-13 | 160714055-1 | ND |
| 2016-07-13 | 160714055-3 | ND |
| 2016-07-13 | 160714055-2 | ND |
| 2017-01-12 | 170113029-1 | ND |
| 2017-07-10 | 170713006-2 | ND |
| 2018-01-08 | 180110074-1 | ND |
| 2018-07-13 | 180717004-002 | ND |
| 2018-09-25 | 18090666-001H | ND |
| 2018-11-05 | 18110114-001H | ND |
| 2019-01-16 | 19010493-003H | ND |
| 2019-01-16 | 19010493-001H | ND |
| 2019-01-16 | 19010493-002H | ND |
| 2019-04-08 | 19040337-001A | ND |
| 2019-04-08 | 19040337-002A | ND |
| 2019-06-13 | 20108289003_ISOC | ND |
| 2019-06-13 | 20108289001_ISOC | ND |
| 2019-06-13 | 20108289002_ISOC | ND |
| 2019-09-12 | 20121489003_ISOC | ND |
| 2019-09-12 | 20121489002_ISOC | ND |
| 2019-09-12 | 20121489001_ISOC | ND |
| 2019-10-14 | 20126124002_ISOC | ND |
| 2019-10-14 | 20126124001_ISOC | ND |
| 2019-11-18 | 20131097001_ISOC | ND |