Diquat
Leeds Water Board
Diquat is a herbicide used on potato crops and aquatic weeds.
31
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 | 12 | 0 | ND |
| 2015 | N/A | 0 | 0 | N/A |
| 2016 | ND | 2 | 0 | ND |
| 2017 | ND | 11 | 0 | ND |
| 2018 | N/A | 0 | 0 | N/A |
| 2019 | ND | 6 | 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 |
|---|---|---|
| 2014-02-07 | 1402-00132-2 | ND |
| 2014-02-07 | 1402-00132-3 | ND |
| 2014-02-07 | 1402-00132-5 | ND |
| 2014-02-07 | 1402-00132-6 | ND |
| 2014-02-07 | 1402-00132-1 | ND |
| 2014-02-07 | 1402-00132-4 | ND |
| 2014-07-21 | 1407-00247-4 | ND |
| 2014-07-21 | 1407-00247-1 | ND |
| 2014-07-21 | 1407-00247-2 | ND |
| 2014-07-21 | 1407-00247-3 | ND |
| 2014-07-21 | 1407-00247-6 | ND |
| 2014-07-21 | 1407-00247-5 | ND |
| 2016-01-19 | 1601-00275-8 | ND |
| 2016-07-18 | 1607-00217-7 | ND |
| 2017-01-10 | 1701-00096-4 | ND |
| 2017-01-10 | 1701-00096-2 | ND |
| 2017-01-10 | 1701-00096-5 | ND |
| 2017-01-10 | 1701-00096-3 | ND |
| 2017-01-10 | 1701-00096-1 | ND |
| 2017-07-18 | 1707-00227-5 | ND |
| 2017-07-18 | 1707-00227-3 | ND |
| 2017-07-18 | 1707-00227-7 | ND |
| 2017-07-18 | 1707-00227-10 | ND |
| 2017-07-18 | 1707-00227-12 | ND |
| 2017-10-04 | 1710-00071-1S | ND |
| 2019-01-15 | 1901-00212-008 | ND |
| 2019-04-25 | 1904-00393-001 | ND |
| 2019-07-17 | 1907-00242-008 | ND |
| 2019-07-31 | 1907-00423-002 | ND |
| 2019-10-21 | 1910-00348-003 | ND |
| 2019-10-21 | 1910-00348-006 | ND |