Additional Well Resources

If you are interested in reviewing other available groundwater-related information associated with your property, the following webpages are available:

How to Search for a Well Log

For information about wells in the GSA basin, contact Well and Septic Permit & Resource Management Department, County of Sonoma by Phone (707) 565-2849 or visit them online at

Well Permit No. Look-up

For record of well permits (requires parcel no.)

Permit Records Look-up
Provides some details of each permit for your property (requires parcel no. or permit no.)

Department of Water Resources’ well log web app