Ground Water Protection Area Maps
A Ground Water Protection Area (GWPA) is defined as an area of land that is vulnerable to the movement of pesticides to ground water according to either leaching or runoff processes. The table below provides links to maps for those counties that have one or more GWPAs. (Counties not listed have no GWPAs.)
After you click on a county use the back button on your browser to return to this list
The following files are viewable in PDF format.
The Adobe Acrobat Reader program allows users to view the entire map
and zoom in on any particular area of interest.
To view the entire map from Adobe Acrobat, open the file and select the "fit in window"
button. Then use the "zoom"
button to view areas of interest by clicking on the
area to zoom in or dragging a particular window. The "pan" 
button can help you view different areas of the map without changing scale. (PDF file sizes range from 100 to 200 kb)
Legend: Yellow 
represents leaching GWPAs; blue 
represents
runoff GWPAs, and orange 
indicates
sections that have both runoff or leaching GWPAs.
| List of counties with GWPAs | |||
|---|---|---|---|
| Butte | Colusa | Contra Costa | Fresno |
| Glenn | Kern | Kings | Los Angeles |
| Madera | Mendocino | Merced | Modoc |
| Monterey | Orange | Placer | Riverside |
| Sacramento | San Bernardino | San Joaquin | San Luis Obispo |
| Shasta | Siskiyou | Solano | Sonoma |
| Stanislaus | Sutter | Tehama | Tulare |
| Ventura | Yolo | Yuba | |