This page lists licensed or relevant well drillers serving Napa, California. It includes contractor names, contact information, service areas, maps, FAQs, and links to related city and driller pages. This page currently includes 10 contractor listings.

Well Drillers in Napa County, California

Napa County is world-renowned for its wine industry, with vineyards covering the valley floor and hillsides. Many wineries, rural estates, and agricultural operations depend on private wells for both domestic and irrigation water. Groundwater management has become increasingly important as the wine industry grows.

Licensed Contractors

10

Avg. Well Depth

~250 ft

County Seat

Napa

Loading map...

Drillers servicing Napa County

Find Well Drillers by City in Napa County

Well Drilling Permits in Napa County

Napa County Environmental Management Division issues well permits. The county has a groundwater ordinance with specific requirements for new well construction. Water availability assessments may be required for large-capacity wells.

All well construction, modification, or destruction in California must be performed by a contractor holding a valid C-57 Well Drilling license issued by the Contractors State License Board (CSLB).

Geology & Drilling Conditions in Napa County

The Napa Valley is filled with alluvial sediments providing good aquifer potential on the valley floor. Surrounding mountains of volcanic and sedimentary rock have fractured rock aquifers with variable yields. Geothermal activity near Calistoga affects groundwater temperatures and chemistry.

Well Guides & Resources

Research well drilling before hiring. Our guides cover costs, permits, depth, and timelines.

Frequently Asked Questions About Well Drilling in Napa County

Do I need a permit to drill a well in Napa County?
Yes, a well permit is required before any drilling can begin in Napa County. Napa County Environmental Management Division issues well permits. The county has a groundwater ordinance with specific requirements for new well construction. Water availability assessments may be required for large-capacity wells. All well work must be performed by a contractor holding a valid California C-57 Well Drilling license.
How much does it cost to drill a well in Napa County?
Well drilling costs in Napa County typically range from $15,000 to $50,000 or more, depending on depth, geological conditions, and site accessibility. Average well depths in the area are around 250 feet. Getting quotes from multiple licensed C-57 contractors is the best way to estimate your specific project cost.
How deep are wells typically drilled in Napa County?
Wells in Napa County average around 250 feet deep, though actual depth varies with location, geology, and intended use. The Napa Valley is filled with alluvial sediments providing good aquifer potential on the valley floor. Surrounding mountains of volcanic and sedimentary rock have fractured rock aquifers with variable yields. Geothermal activity near Calistoga affects groundwater temperatures and chemistry.
How do I find a licensed well driller in Napa County?
You can browse our directory of verified C-57 licensed well drilling contractors serving Napa County right on this page. Every contractor listed holds a valid California C-57 Well Drilling license verified through the Contractors State License Board (CSLB). We recommend contacting multiple drillers for quotes and checking their license status before hiring.
What should I know about water quality from a well in Napa County?
Water quality from private wells in Napa County depends on local geology and land use. It is recommended that you test your well water annually for bacteria, nitrates, and other contaminants. Napa County Environmental Health can provide guidance on recommended testing. California does not regulate private well water quality, so testing is the homeowner's responsibility.

Nearby Counties