Diquat
Shreveport Water System
Diquat is a herbicide used on potato crops and aquatic weeds.
20
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 | 2 | 0 | ND |
| 2015 | ND | 4 | 0 | ND |
| 2016 | ND | 4 | 0 | ND |
| 2017 | ND | 4 | 0 | ND |
| 2018 | ND | 2 | 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 |
|---|---|---|
| 2014-07-14 | AD93520 | ND |
| 2014-07-14 | AD93520 | ND |
| 2015-03-23 | 35181011001 | ND |
| 2015-03-23 | 35181011001 | ND |
| 2015-10-19 | 35212906001 | ND |
| 2015-10-19 | 35212906001 | ND |
| 2016-04-12 | 35239164006 | ND |
| 2016-04-12 | 35239164006 | ND |
| 2016-12-08 | 35282332002 | ND |
| 2016-12-08 | 35282332002 | ND |
| 2017-04-17 | 35307223001 | ND |
| 2017-04-17 | 35307223001 | ND |
| 2017-12-13 | 35363594004 | ND |
| 2017-12-13 | 35363594004 | ND |
| 2018-01-08 | 35367518001 | ND |
| 2018-01-08 | 35367518001 | ND |
| 2019-02-18 | 35449627001 | ND |
| 2019-02-18 | 35449627001 | ND |
| 2019-07-25 | 35485236001 | ND |
| 2019-07-25 | 35485236001 | ND |