Diquat
Antelope Valley - East Kern Water Agency
Diquat is a herbicide used on potato crops and aquatic weeds.
14
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 |
|---|---|---|---|---|
| 2014 | ND | 2 | 0 | ND |
| 2015 | N/A | 0 | 0 | N/A |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | ND | 2 | 0 | ND |
| 2018 | ND | 6 | 0 | ND |
| 2019 | ND | 4 | 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 |
|---|---|---|
| 2014-09-10 | 9588-015-1016 | ND |
| 2014-12-03 | 9588-015-0954 | ND |
| 2017-08-09 | 9590-015-0831 | ND |
| 2017-12-20 | 9590-015-0931 | ND |
| 2018-02-28 | 9590-019-0928 | ND |
| 2018-03-21 | 9590-023-0830 | ND |
| 2018-05-23 | 9590-019-0947 | ND |
| 2018-06-20 | 9590-023-1023 | ND |
| 2018-06-20 | 9590-024-0811 | ND |
| 2018-08-08 | 9590-019-1055 | ND |
| 2019-08-14 | 9590-017-0925 | ND |
| 2019-08-14 | 9590-018-1145 | ND |
| 2019-11-13 | 9590-017-0940 | ND |
| 2019-11-13 | 9590-018-1235 | ND |