Diquat
Belvidere
Diquat is a herbicide used on potato crops and aquatic weeds.
30
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 | N/A | 0 | 0 | N/A |
| 2015 | ND | 14 | 0 | ND |
| 2016 | ND | 2 | 0 | ND |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | ND | 12 | 0 | ND |
| 2019 | ND | 2 | 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 |
|---|---|---|
| 2015-02-10 | 5021964-02 | ND |
| 2015-02-10 | 5021964-03 | ND |
| 2015-02-10 | 5021968-01 | ND |
| 2015-02-10 | 5021968-02 | ND |
| 2015-02-10 | 5021968-03 | ND |
| 2015-02-10 | 5021964-01 | ND |
| 2015-04-07 | 5041620-01 | ND |
| 2015-04-07 | 5041620-02 | ND |
| 2015-04-07 | 5041620-03 | ND |
| 2015-04-07 | 5041620-04 | ND |
| 2015-04-07 | 5041657-01 | ND |
| 2015-04-07 | 5041657-02 | ND |
| 2015-08-04 | 5081145-01 | ND |
| 2015-10-27 | 5104292-01 | ND |
| 2016-01-05 | 6011007-01 | ND |
| 2016-04-05 | 6041267-01 | ND |
| 2018-02-14 | 1802861-003A | ND |
| 2018-02-20 | 1802D45-006A | ND |
| 2018-02-20 | 1802D45-012A | ND |
| 2018-02-20 | 1802D45-015A | ND |
| 2018-02-21 | 1802D45-003A | ND |
| 2018-02-21 | 1802D45-009A | ND |
| 2018-04-18 | 1804D35-003A | ND |
| 2018-05-02 | 1805210-003A | ND |
| 2018-05-08 | 1805739-009A | ND |
| 2018-05-08 | 1805739-012A | ND |
| 2018-05-09 | 1805739-003A | ND |
| 2018-05-09 | 1805739-006A | ND |
| 2019-01-08 | 1901379-001E | ND |
| 2019-12-10 | 9122120-01 | ND |