Diquat
Newellton Water System
Diquat is a herbicide used on potato crops and aquatic weeds.
22
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 | ND | 4 | 0 | ND |
| 2016 | ND | 4 | 0 | ND |
| 2017 | ND | 4 | 0 | ND |
| 2018 | ND | 4 | 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 |
|---|---|---|
| 2014-03-17 | AD89855 | ND |
| 2014-03-17 | AD89855 | ND |
| 2015-03-03 | 35177844005 | ND |
| 2015-03-03 | 35177844005 | ND |
| 2015-09-16 | 35207972016 | ND |
| 2015-09-16 | 35207972016 | ND |
| 2016-01-11 | 35224622004 | ND |
| 2016-01-11 | 35224622004 | ND |
| 2016-09-07 | 35264598001 | ND |
| 2016-09-07 | 35264598001 | ND |
| 2017-01-09 | 35288675005 | ND |
| 2017-01-09 | 35288675005 | ND |
| 2017-09-25 | 35338816006 | ND |
| 2017-09-25 | 35338816006 | ND |
| 2018-01-08 | 35367824001 | ND |
| 2018-01-08 | 35367824001 | ND |
| 2018-07-30 | 35407879001 | ND |
| 2018-07-30 | 35407879001 | ND |
| 2019-01-14 | 35442603002 | ND |
| 2019-01-14 | 35442603002 | ND |
| 2019-07-31 | 35486738001 | ND |
| 2019-07-31 | 35486738001 | ND |