Diquat
Beauregard Water Works District #3
Diquat is a herbicide used on potato crops and aquatic weeds.
46
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 | N/A | 0 | 0 | N/A |
| 2015 | ND | 2 | 0 | ND |
| 2016 | 0.0860 ppb | 20 | 2 | ND - 0.860 ppb |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | ND | 24 | 0 | ND |
| 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 |
|---|---|---|
| 2015-03-02 | 35177665002 | ND |
| 2015-03-02 | 35177665002 | ND |
| 2016-01-19 | 35225812002 | ND |
| 2016-01-19 | 35225812001 | ND |
| 2016-01-19 | 35225812002 | ND |
| 2016-01-19 | 35225812005 | 0.860 ppb |
| 2016-01-19 | 35225812004 | ND |
| 2016-01-19 | 35225812003 | ND |
| 2016-01-19 | 35225812001 | ND |
| 2016-01-19 | 35225812005 | 0.860 ppb |
| 2016-01-19 | 35225812004 | ND |
| 2016-01-19 | 35225812003 | ND |
| 2016-02-01 | 35227539001 | ND |
| 2016-02-01 | 35227539002 | ND |
| 2016-02-01 | 35227539003 | ND |
| 2016-02-01 | 35227539004 | ND |
| 2016-02-01 | 35227539004 | ND |
| 2016-02-01 | 35227539003 | ND |
| 2016-02-01 | 35227539002 | ND |
| 2016-02-01 | 35227539001 | ND |
| 2016-05-02 | 35242594004 | ND |
| 2016-05-02 | 35242594004 | ND |
| 2018-02-27 | 35377534001 | ND |
| 2018-02-27 | 35377534001 | ND |
| 2018-03-19 | 35381349004 | ND |
| 2018-03-19 | 35381349005 | ND |
| 2018-03-19 | 35381349004 | ND |
| 2018-03-19 | 35381349003 | ND |
| 2018-03-19 | 35381349002 | ND |
| 2018-03-19 | 35381349001 | ND |
| 2018-03-19 | 35381349005 | ND |
| 2018-03-19 | 35381349001 | ND |
| 2018-03-19 | 35381349002 | ND |
| 2018-03-19 | 35381349003 | ND |
| 2018-04-04 | 35384625001 | ND |
| 2018-04-04 | 35384625001 | ND |
| 2018-04-16 | 35387317001 | ND |
| 2018-04-16 | 35387317005 | ND |
| 2018-04-16 | 35387317004 | ND |
| 2018-04-16 | 35387317003 | ND |
| 2018-04-16 | 35387317002 | ND |
| 2018-04-16 | 35387317001 | ND |
| 2018-04-16 | 35387317005 | ND |
| 2018-04-16 | 35387317004 | ND |
| 2018-04-16 | 35387317003 | ND |
| 2018-04-16 | 35387317002 | ND |