Diquat
SCWA Mather-Sunrise
Diquat is a herbicide used on potato crops and aquatic weeds.
22
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 | ND | 7 | 0 | ND |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | ND | 6 | 0 | ND |
| 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 |
|---|---|---|
| 2014-08-13 | 5810-017-1106 | ND |
| 2014-08-13 | 5810-016-1145 | ND |
| 2014-08-13 | 5810-015-1205 | ND |
| 2014-08-13 | 5810-008-0800 | ND |
| 2014-08-13 | 5810-007-0817 | ND |
| 2014-08-13 | 5810-006-1005 | ND |
| 2014-08-13 | 5810-001-0914 | ND |
| 2014-08-13 | 5810-002-0842 | ND |
| 2015-08-19 | 5810-001-1227 | ND |
| 2015-08-19 | 5810-002-1324 | ND |
| 2015-08-19 | 5810-006-1155 | ND |
| 2015-08-19 | 5810-007-1037 | ND |
| 2015-08-20 | 5810-015-0930 | ND |
| 2015-08-20 | 5810-016-0856 | ND |
| 2015-08-20 | 5810-017-0819 | ND |
| 2018-08-09 | 5810-001-1438 | ND |
| 2018-08-09 | 5810-015-1526 | ND |
| 2018-08-09 | 5810-006-1416 | ND |
| 2018-08-09 | 5810-002-1354 | ND |
| 2018-08-16 | 5810-017-1239 | ND |
| 2018-08-16 | 5810-016-1343 | ND |
| 2019-05-06 | 5810-007-1415 | ND |