Diquat
Southwest Ouachita Waterworks Inc.
Diquat is a herbicide used on potato crops and aquatic weeds.
28
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 | 12 | 0 | ND |
| 2015 | ND | 2 | 0 | ND |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | ND | 14 | 0 | ND |
| 2018 | N/A | 0 | 0 | N/A |
| 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 |
|---|---|---|
| 2014-06-16 | AD92414 | ND |
| 2014-06-16 | AD92413 | ND |
| 2014-06-16 | AD92414 | ND |
| 2014-06-16 | AD92413 | ND |
| 2014-10-20 | AD98782 | ND |
| 2014-10-20 | AD98780 | ND |
| 2014-10-20 | AD98781 | ND |
| 2014-10-20 | AD98782 | ND |
| 2014-10-20 | AD98783 | ND |
| 2014-10-20 | AD98781 | ND |
| 2014-10-20 | AD98780 | ND |
| 2014-10-20 | AD98783 | ND |
| 2015-01-05 | AE00867 | ND |
| 2015-01-05 | AE00867 | ND |
| 2017-06-12 | 35318592003 | ND |
| 2017-06-12 | 35318592002 | ND |
| 2017-06-12 | 35318592001 | ND |
| 2017-06-12 | 35318592001 | ND |
| 2017-06-12 | 35318592002 | ND |
| 2017-06-12 | 35318592003 | ND |
| 2017-10-16 | 35343270001 | ND |
| 2017-10-16 | 35343270004 | ND |
| 2017-10-16 | 35343270003 | ND |
| 2017-10-16 | 35343270002 | ND |
| 2017-10-16 | 35343270001 | ND |
| 2017-10-16 | 35343270004 | ND |
| 2017-10-16 | 35343270003 | ND |
| 2017-10-16 | 35343270002 | ND |