Diquat
Sandy Point 480 Water System
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 |
|---|---|---|---|---|
| 2014 | ND | 2 | 0 | ND |
| 2015 | ND | 4 | 0 | ND |
| 2016 | ND | 4 | 0 | ND |
| 2017 | ND | 4 | 0 | ND |
| 2018 | ND | 4 | 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 |
|---|---|---|
| 2014-04-14 | AD90603 | ND |
| 2014-04-14 | AD90603 | ND |
| 2015-03-09 | 35178883002 | ND |
| 2015-03-09 | 35178883002 | ND |
| 2015-10-12 | 35211703002 | ND |
| 2015-10-12 | 35211703002 | ND |
| 2016-04-12 | 35239164009 | ND |
| 2016-04-12 | 35239164009 | ND |
| 2016-11-21 | 35279123005 | ND |
| 2016-11-21 | 35279123005 | ND |
| 2017-04-10 | 35306447003 | ND |
| 2017-04-10 | 35306447003 | ND |
| 2017-10-23 | 35344158001 | ND |
| 2017-10-23 | 35344158001 | ND |
| 2018-01-22 | 35370032001 | ND |
| 2018-01-22 | 35370032001 | ND |
| 2018-07-31 | 35408506001 | ND |
| 2018-07-31 | 35408506001 | ND |
| 2019-02-25 | 35450974001 | ND |
| 2019-02-25 | 35450974001 | ND |
| 2019-08-26 | 35493340001 | ND |
| 2019-08-26 | 35493340001 | ND |