Well Drillers in Marin County, California
Marin County, just north of the Golden Gate, includes both suburban communities and rural areas in West Marin. Private wells are common in the coastal and agricultural areas of Point Reyes, Tomales, Nicasio, and western San Geronimo Valley.
Licensed Contractors
11
Avg. Well Depth
~200 ft
County Seat
San Rafael
Licensed C-57 Contractors in Marin County
ALTAMONT WATER WELL AND PUMP
ActivePLEASANTON, CA 94566
(925) 980 1066
Expires: 2027-03-31
License #958797· Verified Active C-57Services your area
View Details →AMERICAN CONSTRUCTION AND SUPPLY INC
ActiveCORTE MADERA, CA 94976
(415) 927 2024
Expires: 2027-03-31
License #310599· Verified Active C-57Services your area
View Details →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 →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 →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 →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 Marin County
Well Drilling Permits in Marin County
Marin County Environmental Health Services issues well permits. Coastal zone and agricultural land-use designations may add permit requirements. Setback distances from septic systems and surface water are strictly enforced.
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 Marin County
Marin's geology is dominated by Franciscan Complex rocks with limited fracture-based aquifers. Coastal terraces and small alluvial valleys provide the most productive well sites. Well yields tend to be low, and water conservation is essential.
Frequently Asked Questions About Well Drilling in Marin County
Do I need a permit to drill a well in Marin County?
Yes, a well permit is required before any drilling can begin in Marin County. Marin County Environmental Health Services issues well permits. Coastal zone and agricultural land-use designations may add permit requirements. Setback distances from septic systems and surface water are strictly enforced. 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 Marin County?
Well drilling costs in Marin 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 Marin County?
Wells in Marin County average around 200 feet deep, though actual depth varies with location, geology, and intended use. Marin's geology is dominated by Franciscan Complex rocks with limited fracture-based aquifers. Coastal terraces and small alluvial valleys provide the most productive well sites. Well yields tend to be low, and water conservation is essential.
How do I find a licensed well driller in Marin County?
You can browse our directory of verified C-57 licensed well drilling contractors serving Marin 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 Marin County?
Water quality from private wells in Marin County depends on local geology and land use. It is recommended that you test your well water annually for bacteria, nitrates, and other contaminants. Marin County Environmental Health can provide guidance on recommended testing. California does not regulate private well water quality, so testing is the homeowner's responsibility.