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

Licensed C-57 Contractors in Napa County

ALTAMONT WATER WELL AND PUMP

Active
PLEASANTON, CA 94566
(925) 980 1066
Expires: 2027-03-31
License #958797· Verified Active C-57Services your area
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CLEAR HEART DRILLING INC

Active
SANTA ROSA, CA 95401
(707) 568 6095
Expires: 2026-06-30
License #780357· Verified Active C-57Services your area
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DOSHIER-GREGSON INC

Active
AMERICAN CANYON, CA 94503
(707) 226 9698
Expires: 2026-10-31
License #258826· Verified Active C-57Services your area
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HUCKFELDT WELL DRILLING INC

Active
NAPA, CA 94558
(707) 255 7923
Expires: 2027-07-31
License #439746· Verified Active C-57Services your area
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JERRY AND DON'S YAGER PUMP AND WELL SERVICE

Active
PETALUMA, CA 94953
(707) 762 1473
Expires: 2026-08-31
License #424778· Verified Active C-57Services your area
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KOENIG DRILLING

Active
COTATI, CA 94931
(707) 888 9617
Expires: 2026-04-30
License #1038648· Verified Active C-57Services your area
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MC LEAN & WILLIAMS INC

Active
NAPA, CA 94558
(707) 255 6450
Expires: 2026-12-31
License #396352· Verified Active C-57Services your area
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OASIS PUMP & DRILLING

Active
PETALUMA, CA 94952
(707) 762 4028
Expires: 2026-08-31
License #242168· Verified Active C-57Services your area
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PACIFIC COAST WELL & PUMP INC

Active
SAN RAMON, CA 94583
(510) 581 6000
Expires: 2026-07-31
License #810579· Verified Active C-57Services your area
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WEEKS DRILLING AND PUMP CO

Active
SEBASTOPOL, CA 95473
(707) 823 3184
Expires: 2026-09-30
License #177681· Verified Active C-57Services your area
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Find Well Drillers by City in Napa County

Napa

Pop. 79,068

American Canyon

Pop. 20,768

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.

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.

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