California Water Well
Drilling Cost
The average residential well in California is 350 feet deep and costs $17,500 in 2026. Drilling rates range from $35 to $75 per foot, with total project costs varying based on depth, geology, and pump system.
Avg. Well Depth
350 ft
Cost / Foot
$35–$75
Total Project
$17,500
vs. National
133% above avg.
California Well Drilling Cost by Depth
| Well Depth | Drilling Only | Complete System | Est. Total |
|---|---|---|---|
| 100 ft | $3,500–$7,500 | $8,300–$12,300 | $9,800 |
| 150 ft | $5,250–$11,250 | $10,450–$16,450 | $12,700 |
| 200 ft | $7,000–$15,000 | $12,600–$20,600 | $15,600 |
| 300 ft | $10,500–$22,500 | $16,900–$28,900 | $21,400 |
| 400 ft | $14,000–$30,000 | $21,200–$37,200 | $27,200 |
| 500 ft | $17,500–$37,500 | $25,500–$45,500 | $33,000 |
*Drilling only = drilling labor per foot. Complete system includes casing, pump, pressure tank, electrical, and permits. Costs are California estimates for 2026.
California Well System Component Costs
| Service | Low | High | Average |
|---|---|---|---|
| Well Casing — PVC (350 ft) | $2,100 | $3,850 | $2,800 |
| Well Casing — Steel (350 ft) | $10,500 | $45,500 | $22,750 |
| Submersible Pump | $300 | $2,000 | $1,000 |
| Pressure Tank | $500 | $2,000 | $1,100 |
| Electrical Hookup | $1,000 | $3,000 | $1,800 |
| Permits | $300 | $2,000 | Varies |
| Water Quality Testing | $50 | $500 | $200 |
*Component costs based on California average well depth of 350 ft. Steel casing is typically required for bedrock wells; PVC is used in unconsolidated formations.
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Itemized Cost Estimate
This estimate is 37% above the California average of $17,500
Estimates are approximate. Actual costs depend on site conditions and contractor pricing.
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California Geology & Aquifers
California's Central Valley sits atop one of the world's most productive aquifer systems with thick sequences of alluvial fan deposits, while coastal areas have smaller, fractured bedrock aquifers. Sierra Nevada foothills require drilling through granite and metamorphic rock.
Understanding your local geology is important because rock type directly affects drilling cost. Hard crystalline rock (granite, gneiss) costs more to penetrate than soft sedimentary formations (sandstone, limestone) or unconsolidated deposits (sand, gravel). Your well driller can estimate costs based on nearby well logs.
Primary Aquifer
Central Valley Aquifer System / Coastal Basin Aquifers
Water table depth: 50-300 feet in the Central Valley (declining in some basins due to overdraft); 100-600 feet in Southern California
Best Drilling Season
Year-round in most areas; some mountain regions limited by snow access from November through March
Population on well water: About 10% of California households use private wells, but the Central Valley has some of the highest concentrations of domestic well users in the nation
Why Well Depth Varies in California
Wells in California range from 100 to 800 feet deep. The wide range is driven by regional differences in geology, water table depth, and aquifer type. A well in one part of the state may cost significantly more or less than another area just 50 miles away.
100 ft
Shallowest typical wells
Usually in areas with high water tables, sandy soils, or alluvial aquifers near rivers
350 ft
State average depth
Typical residential well for most California locations
800 ft
Deepest typical wells
Usually in arid areas, mountain terrain, or where shallow aquifers are depleted
California Well Drilling Permits & Regulations
California requires a C-57 Water Well Drilling Contractor license from the Contractors State License Board. Homeowner drilling is effectively prohibited due to licensing and environmental requirements.
Permit Authority
- Authority
- County Environmental Health Departments issue permits; the State Water Resources Control Board oversees Sustainable Groundwater Management Act (SGMA) compliance
- Permit Cost
- $300-$2,000 (varies dramatically by county)
Water Rights
- Doctrine
- Correlative Rights for overlying landowners; Prior Appropriation for surplus groundwater; SGMA adds sustainability requirements
Well Water Quality in California
Well water quality in California varies by location and aquifer type. Testing your water at least annually is recommended, and a comprehensive test should be done before using a new well.
Common Water Quality Issues
arsenic
Treatment: reverse osmosis or adsorption media filter
nitrate
Treatment: reverse osmosis or ion exchange system
hexavalent chromium
Treatment: appropriate treatment system
1,2,3-TCP
Treatment: appropriate treatment system
total dissolved solids
Treatment: reverse osmosis system
uranium
Treatment: reverse osmosis or ion exchange system
Testing Recommendations
- Before first use: Full panel including bacteria, nitrates, pH, and state-specific contaminants ($150–$500)
- Annually: Bacteria (coliform) and nitrate testing at minimum ($50–$100)
- After flooding or repairs: Bacteria test to confirm well integrity ($25–$50)
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Well Drilling Costs by City in California
Well drilling costs vary by location within California. Select a city for local pricing details.
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