Diquat
Town of Greenwood Water System
Diquat is a herbicide used on potato crops and aquatic weeds.
26
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 | 8 | 0 | ND |
| 2015 | ND | 4 | 0 | ND |
| 2016 | ND | 4 | 0 | ND |
| 2017 | ND | 4 | 0 | ND |
| 2018 | ND | 2 | 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 |
|---|---|---|
| 2014-04-07 | AD90461 | ND |
| 2014-04-07 | AD90461 | ND |
| 2014-06-16 | AD92363 | ND |
| 2014-06-16 | AD92364 | ND |
| 2014-06-16 | AD92365 | ND |
| 2014-06-16 | AD92365 | ND |
| 2014-06-16 | AD92364 | ND |
| 2014-06-16 | AD92363 | ND |
| 2015-03-23 | 35181011005 | ND |
| 2015-03-23 | 35181011005 | ND |
| 2015-10-19 | 35212906005 | ND |
| 2015-10-19 | 35212906005 | ND |
| 2016-05-02 | 35242556005 | ND |
| 2016-05-02 | 35242556005 | ND |
| 2016-12-08 | 35282332006 | ND |
| 2016-12-08 | 35282332006 | ND |
| 2017-04-17 | 35307223003 | ND |
| 2017-04-17 | 35307223003 | ND |
| 2017-12-13 | 35363594002 | ND |
| 2017-12-13 | 35363594002 | ND |
| 2018-01-08 | 35367517001 | ND |
| 2018-01-08 | 35367517001 | ND |
| 2019-02-21 | 35449632001 | ND |
| 2019-02-21 | 35449632001 | ND |
| 2019-07-25 | 35485235001 | ND |
| 2019-07-25 | 35485235001 | ND |