Diquat
Cassatt Water Kershaw-lee Company RWA
Diquat is a herbicide used on potato crops and aquatic weeds.
29
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 | 6 | 0 | ND |
| 2015 | N/A | 0 | 0 | N/A |
| 2016 | ND | 11 | 0 | ND |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | N/A | 0 | 0 | N/A |
| 2019 | ND | 12 | 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 |
|---|---|---|
| 2014-01-22 | AD34864 | ND |
| 2014-01-22 | AD34860 | ND |
| 2014-04-23 | AD38844 | ND |
| 2014-04-23 | AD38845 | ND |
| 2014-08-13 | AD44050 | ND |
| 2014-10-30 | AD47415 | ND |
| 2016-04-19 | AD74642 | ND |
| 2016-04-19 | AD74644 | ND |
| 2016-04-19 | AD74641 | ND |
| 2016-04-19 | AD74643 | ND |
| 2016-08-03 | AD80276 | ND |
| 2016-08-03 | AD80277 | ND |
| 2016-08-03 | AD80279 | ND |
| 2016-08-03 | AD80278 | ND |
| 2016-08-03 | AD80280 | ND |
| 2016-09-15 | AD82548 | ND |
| 2016-09-19 | AD82888 | ND |
| 2019-04-24 | AE29258 | ND |
| 2019-04-24 | AE29260 | ND |
| 2019-04-24 | AE29257 | ND |
| 2019-04-24 | AE29261 | ND |
| 2019-05-01 | AE29682 | ND |
| 2019-05-01 | AE29684 | ND |
| 2019-05-01 | AE29685 | ND |
| 2019-05-01 | AE29686 | ND |
| 2019-05-01 | AE29691 | ND |
| 2019-05-01 | AE29688 | ND |
| 2019-05-01 | AE29692 | ND |
| 2019-05-01 | AE29689 | ND |