Well Drillers in Sonoma County, California
Sonoma County is celebrated for wine country, coastal beauty, and rural agriculture. Well drilling is widespread in the vineyards, rural communities, and coastal areas throughout the county. The Sonoma and Russian River valleys have particularly active well construction.
Licensed Contractors
13
Avg. Well Depth
~200 ft
County Seat
Santa Rosa
Licensed C-57 Contractors in Sonoma County
CLEAR HEART DRILLING INC
ActiveSANTA ROSA, CA 95401
(707) 568 6095
Expires: 2026-06-30
License #780357· Verified Active C-57Services your area
View Details →FISCH BROS DRILLING
ActiveSEBASTOPOL, CA 95472
(707) 823 3891
Expires: 2027-02-28
License #399226· Verified Active C-57Services your area
View Details →HUCKFELDT WELL DRILLING INC
ActiveNAPA, CA 94558
(707) 255 7923
Expires: 2027-07-31
License #439746· Verified Active C-57Services your area
View Details →IRWIN WELL DRILLING INC
ActiveFULTON, CA 95439
(707) 303 5984
Expires: 2027-02-28
License #891725· Verified Active C-57Services your area
View Details →JERRY AND DON'S YAGER PUMP AND WELL SERVICE
ActivePETALUMA, CA 94953
(707) 762 1473
Expires: 2026-08-31
License #424778· Verified Active C-57Services your area
View Details →KOENIG DRILLING
ActiveCOTATI, CA 94931
(707) 888 9617
Expires: 2026-04-30
License #1038648· Verified Active C-57Services your area
View Details →OASIS PUMP & DRILLING
ActivePETALUMA, CA 94952
(707) 762 4028
Expires: 2026-08-31
License #242168· Verified Active C-57Services your area
View Details →PACIFIC COAST WELL & PUMP INC
ActiveSAN RAMON, CA 94583
(510) 581 6000
Expires: 2026-07-31
License #810579· Verified Active C-57Services your area
View Details →PEARSON DRILLING
ActiveFORESTVILLE, CA 95436
(707) 887 8349
Expires: 2026-07-31
License #781870· Verified Active C-57Services your area
View Details →PETERSEN LES DRILLING & PUMP INC
ActiveSANTA ROSA, CA 95403
(707) 545 0246
Expires: 2026-12-31
License #261084· Verified Active C-57Services your area
View Details →R W R CONSTRUCTION INC
ActiveSAN RAFAEL, CA 94901
(415) 457 5658
Expires: 2027-08-31
License #527433· Verified Active C-57Services your area
View Details →RAZO DRILLING AND PUMP CO
ActiveSANTA ROSA, CA 95407
(707) 280 4958
Expires: 2026-06-30
License #1122070· Verified Active C-57Services your area
View Details →WEEKS DRILLING AND PUMP CO
ActiveSEBASTOPOL, CA 95473
(707) 823 3184
Expires: 2026-09-30
License #177681· Verified Active C-57Services your area
View Details →Find Well Drillers by City in Sonoma County
Well Drilling Permits in Sonoma County
Sonoma County Permit and Resource Management Department issues well permits through its Well and Septic Section. Groundwater availability zones may limit new well construction in some areas. The county has a comprehensive ordinance governing well construction.
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 Sonoma County
Sonoma Valley and Russian River Valley have productive alluvial aquifers. The volcanic Sonoma Mountains have fractured rock aquifers with moderate yields. Coastal areas have limited groundwater. The county actively manages groundwater through its Groundwater Sustainability Agency.
Frequently Asked Questions About Well Drilling in Sonoma County
Do I need a permit to drill a well in Sonoma County?
Yes, a well permit is required before any drilling can begin in Sonoma County. Sonoma County Permit and Resource Management Department issues well permits through its Well and Septic Section. Groundwater availability zones may limit new well construction in some areas. The county has a comprehensive ordinance governing well construction. 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 Sonoma County?
Well drilling costs in Sonoma 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 200 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 Sonoma County?
Wells in Sonoma County average around 200 feet deep, though actual depth varies with location, geology, and intended use. Sonoma Valley and Russian River Valley have productive alluvial aquifers. The volcanic Sonoma Mountains have fractured rock aquifers with moderate yields. Coastal areas have limited groundwater. The county actively manages groundwater through its Groundwater Sustainability Agency.
How do I find a licensed well driller in Sonoma County?
You can browse our directory of verified C-57 licensed well drilling contractors serving Sonoma 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 Sonoma County?
Water quality from private wells in Sonoma County depends on local geology and land use. It is recommended that you test your well water annually for bacteria, nitrates, and other contaminants. Sonoma County Environmental Health can provide guidance on recommended testing. California does not regulate private well water quality, so testing is the homeowner's responsibility.