Diquat
Greenville Water Works
Diquat is a herbicide used on potato crops and aquatic weeds.
19
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 | 8 | 0 | ND |
| 2017 | ND | 1 | 0 | ND |
| 2018 | N/A | 0 | 0 | N/A |
| 2019 | ND | 8 | 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 |
|---|---|---|
| 2014-01-22 | 140123021-1 | ND |
| 2014-04-22 | 140423019-1 | ND |
| 2016-01-19 | 160120029-3 | ND |
| 2016-01-19 | 160120029-2 | ND |
| 2016-01-19 | 160120029-4 | ND |
| 2016-01-19 | 160120029-1 | ND |
| 2016-04-21 | 160421043-2 | ND |
| 2016-04-21 | 160421043-4 | ND |
| 2016-04-21 | 160421043-3 | ND |
| 2016-04-21 | 160421043-1 | ND |
| 2017-07-20 | 170721024-1 | ND |
| 2019-01-22 | 19010596-002H | ND |
| 2019-01-22 | 19010596-003H | ND |
| 2019-01-22 | 19010596-001H | ND |
| 2019-01-22 | 19010596-004H | ND |
| 2019-08-20 | 194263-01SOC | ND |
| 2019-08-20 | 194264-01SOC | ND |
| 2019-08-20 | 194266-01SOC | ND |
| 2019-08-20 | 194265-01SOC | ND |