Diquat
Town of Ferriday Water System
Diquat is a herbicide used on potato crops and aquatic weeds.
24
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 | 6 | 0 | ND |
| 2016 | ND | 8 | 0 | ND |
| 2017 | N/A | 0 | 0 | N/A |
| 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 |
|---|---|---|
| 2014-03-17 | AD89796 | ND |
| 2014-03-17 | AD89796 | ND |
| 2015-07-13 | 35197766003 | ND |
| 2015-07-13 | 35197766003 | ND |
| 2015-08-17 | 35203233006 | ND |
| 2015-08-17 | 35203233006 | ND |
| 2015-09-16 | 35208078002 | ND |
| 2015-09-16 | 35208078002 | ND |
| 2016-10-13 | 35270878004 | ND |
| 2016-10-13 | 35270878003 | ND |
| 2016-10-13 | 35270878002 | ND |
| 2016-10-13 | 35270878001 | ND |
| 2016-10-13 | 35270878004 | ND |
| 2016-10-13 | 35270878003 | ND |
| 2016-10-13 | 35270878002 | ND |
| 2016-10-13 | 35270878001 | ND |
| 2019-08-15 | 35491138001 | ND |
| 2019-08-15 | 35491138004 | ND |
| 2019-08-15 | 35491138003 | ND |
| 2019-08-15 | 35491138002 | ND |
| 2019-08-15 | 35491138001 | ND |
| 2019-08-15 | 35491138004 | ND |
| 2019-08-15 | 35491138003 | ND |
| 2019-08-15 | 35491138002 | ND |