Diquat
Sunnyslope County Water District
Diquat is a herbicide used on potato crops and aquatic weeds.
19
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 | 8 | 0 | ND |
| 2015 | N/A | 0 | 0 | N/A |
| 2016 | ND | 2 | 0 | ND |
| 2017 | ND | 8 | 0 | ND |
| 2018 | N/A | 0 | 0 | N/A |
| 2019 | ND | 1 | 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 |
|---|---|---|
| 2014-01-08 | 5810-009-1120 | ND |
| 2014-01-08 | 5810-007-0935 | ND |
| 2014-01-08 | 5810-003-1020 | ND |
| 2014-01-08 | 5810-002-1050 | ND |
| 2014-04-02 | 5810-009-1101 | ND |
| 2014-04-02 | 5810-007-0946 | ND |
| 2014-04-02 | 5810-003-1023 | ND |
| 2014-04-02 | 5810-002-1046 | ND |
| 2016-01-07 | 5810-016-0600 | ND |
| 2016-04-13 | 5810-016-0630 | ND |
| 2017-01-18 | 5810-002-0910 | ND |
| 2017-01-18 | 5810-009-0830 | ND |
| 2017-01-18 | 5810-007-0810 | ND |
| 2017-01-18 | 5810-003-0700 | ND |
| 2017-04-06 | 5810-009-0820 | ND |
| 2017-04-06 | 5810-007-0935 | ND |
| 2017-04-06 | 5810-003-0705 | ND |
| 2017-04-06 | 5810-002-0750 | ND |
| 2019-01-10 | 5810-016-0920 | ND |