Diquat
SBDNO County Service Area 64
Diquat is a herbicide used on potato crops and aquatic weeds.
16
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 | 4 | 0 | ND |
| 2015 | ND | 8 | 0 | ND |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | ND | 4 | 0 | ND |
| 2018 | N/A | 0 | 0 | N/A |
| 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 |
|---|---|---|
| 2014-01-29 | 9588-001-1415 | ND |
| 2014-01-29 | 9588-002-1200 | ND |
| 2014-01-29 | 9588-004-1310 | ND |
| 2014-01-29 | 9588-005-1045 | ND |
| 2015-01-05 | 9588-002-1230 | ND |
| 2015-07-24 | 9588-006-1630 | ND |
| 2015-07-30 | 3761-006-1525 | ND |
| 2015-07-30 | 9588-006-1525 | ND |
| 2015-08-02 | 3761-006-0700 | ND |
| 2015-08-02 | 9588-006-0700 | ND |
| 2015-08-04 | 3761-006-0700 | ND |
| 2015-08-04 | 9588-006-0700 | ND |
| 2017-01-03 | 3761-002-1100 | ND |
| 2017-01-03 | 3761-005-0940 | ND |
| 2017-01-05 | 3761-004-0900 | ND |
| 2017-01-31 | 3761-001-1000 | ND |