Diquat
Demopolis Water Works and Sewer Board
Diquat is a herbicide used on potato crops and aquatic weeds.
23
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 | N/A | 0 | 0 | N/A |
| 2016 | ND | 10 | 0 | ND |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | N/A | 0 | 0 | N/A |
| 2019 | ND | 13 | 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 |
|---|---|---|
| 2016-02-04 | 160204015-4 | ND |
| 2016-02-04 | 160204015-2 | ND |
| 2016-02-04 | 160204015-1 | ND |
| 2016-02-04 | 160204015-3 | ND |
| 2016-05-06 | 160506028-3 | ND |
| 2016-05-06 | 160506028-1 | ND |
| 2016-05-06 | 160506028-4 | ND |
| 2016-05-06 | 160506028-2 | ND |
| 2016-08-05 | 160805035-001 | ND |
| 2016-11-10 | 161110067-1 | ND |
| 2019-02-07 | 19020263-003H | ND |
| 2019-02-07 | 19020263-001H | ND |
| 2019-02-07 | 19020263-002H | ND |
| 2019-02-07 | 19020263-004H | ND |
| 2019-05-23 | 19050725-001A | ND |
| 2019-08-08 | 20116256003_ISOC | ND |
| 2019-08-08 | 20116256001_ISOC | ND |
| 2019-08-08 | 20116256005_ISOC | ND |
| 2019-08-08 | 20116256002_ISOC | ND |
| 2019-08-08 | 20116256004_ISOC | ND |
| 2019-08-08 | 20116256004_ISOC | ND |
| 2019-08-08 | 20116256003_ISOC | ND |
| 2019-08-08 | 20116256002_ISOC | ND |