Diquat
City of Aiken
Diquat is a herbicide used on potato crops and aquatic weeds.
15
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 | 4 | 0 | ND |
| 2015 | ND | 2 | 0 | ND |
| 2016 | ND | 4 | 0 | ND |
| 2017 | ND | 5 | 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 |
|---|---|---|
| 2014-05-21 | AD40196 | ND |
| 2014-05-21 | AD40198 | ND |
| 2014-05-21 | AD40200 | ND |
| 2014-05-21 | AD40209 | ND |
| 2015-05-20 | AD55699 | ND |
| 2015-11-09 | AD65512 | ND |
| 2016-02-24 | AD71247 | ND |
| 2016-05-04 | AD75337 | ND |
| 2016-05-04 | AD75324 | ND |
| 2016-08-10 | AD80547 | ND |
| 2017-07-12 | AD97139 | ND |
| 2017-07-12 | AD97137 | ND |
| 2017-07-12 | AD97176 | ND |
| 2017-07-12 | AD97143 | ND |
| 2017-07-13 | AD97142 | ND |