Diquat
Tuscaloosa Water & Sewer
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 |
|---|---|---|---|---|
| 2014 | ND | 2 | 0 | ND |
| 2015 | N/A | 0 | 0 | N/A |
| 2016 | ND | 4 | 0 | ND |
| 2017 | ND | 4 | 0 | ND |
| 2018 | ND | 6 | 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 |
|---|---|---|
| 2014-01-16 | 140116032-1 | ND |
| 2014-01-16 | 140116032-2 | ND |
| 2016-01-21 | 161121012-1 | ND |
| 2016-01-21 | 161121012-2 | ND |
| 2016-07-21 | 161721030-1 | ND |
| 2016-07-21 | 161721030-2 | ND |
| 2017-01-19 | 170119024-1 | ND |
| 2017-01-19 | 170119024-2 | ND |
| 2017-07-20 | 170720022-1 | ND |
| 2017-07-20 | 170720022-2 | ND |
| 2018-01-18 | 180118016-1 | ND |
| 2018-01-18 | 180118016-2 | ND |
| 2018-07-19 | 180719028-005 | ND |
| 2018-07-19 | 180719028-001 | ND |
| 2018-07-19 | 180719028-002 | ND |
| 2018-07-19 | 180719028-003 | ND |
| 2019-01-24 | 19010610-001H | ND |
| 2019-01-24 | 19010610-002H | ND |
| 2019-01-24 | 19010610-003H | ND |
| 2019-01-24 | 19010610-005H | ND |