Diquat
St. Louis City
Diquat is a herbicide used on potato crops and aquatic weeds.
34
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 | ND | 6 | 0 | ND |
| 2015 | ND | 2 | 0 | ND |
| 2016 | ND | 6 | 0 | ND |
| 2017 | ND | 6 | 0 | ND |
| 2018 | ND | 6 | 0 | ND |
| 2019 | ND | 8 | 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 |
|---|---|---|
| 2014-03-19 | HBCB031914M549 | ND |
| 2014-03-19 | CRCW031914M549 | ND |
| 2014-06-18 | CRCW061814M549 | ND |
| 2014-06-18 | HBCB061814M549 | ND |
| 2014-09-25 | CRCW092514M549 | ND |
| 2014-09-25 | HBCB092514M549 | ND |
| 2015-11-19 | HBCB111915M549 | ND |
| 2015-11-19 | CRCW111915M549 | ND |
| 2016-03-28 | HBCB032816M549 | ND |
| 2016-03-28 | CRCW032816M549 | ND |
| 2016-08-22 | HBCB082216M549 | ND |
| 2016-08-22 | CRCW082216M549 | ND |
| 2016-11-21 | HBCB112116M549 | ND |
| 2016-11-21 | CRCW112116M549 | ND |
| 2017-02-27 | CRCW022717M549 | ND |
| 2017-02-27 | HBCB022717M549 | ND |
| 2017-09-26 | CRCW092617M549 | ND |
| 2017-09-26 | HBCB092617M549 | ND |
| 2017-11-17 | CRCW111717M549 | ND |
| 2017-11-17 | HBCB111717M549 | ND |
| 2018-06-25 | CRCW062518M549 | ND |
| 2018-06-25 | HBCB062518M549 | ND |
| 2018-09-26 | CRCW092618M549 | ND |
| 2018-09-26 | HBCB092618M549 | ND |
| 2018-11-13 | HBCB111318M549 | ND |
| 2018-11-13 | CRCW111318M549 | ND |
| 2019-02-25 | CRCW022519M549 | ND |
| 2019-02-25 | HBCB022519M549 | ND |
| 2019-05-23 | CRCW052319M549 | ND |
| 2019-05-23 | HBCB052319M549 | ND |
| 2019-08-20 | CRCW082019M549 | ND |
| 2019-08-20 | HBCB082019M549 | ND |
| 2019-11-21 | CRCW112119M549 | ND |
| 2019-11-21 | HBCB112119M549 | ND |