California Well Statistics 2026: 47 Facts & Data You Need to Know
📋 In This Guide
- Table of Contents
- California Well Overview Statistics
- Well Drilling Permits by County (2026 Data)
- Well Depth Statistics by Region
- Well Drilling Cost Statistics (2026)
- California Groundwater Statistics
- Historical Trends & Projections
- Frequently Asked Questions
- Need a Well Drilled in Southern California?
- Related Articles
California Well Overview Statistics
California's private water well infrastructure represents one of the largest in the United States, serving millions of residents, farms, and businesses. Here are the key statistics for 2026:
Source: California DWR Well Completion Report Database, 2026
Well Population by Type
| Well Type | Number of Wells | % of Total |
|---|---|---|
| Domestic/Residential | 687,000 | 52.3% |
| Agricultural/Irrigation | 412,000 | 31.4% |
| Industrial/Commercial | 89,000 | 6.8% |
| Monitoring Wells | 78,000 | 5.9% |
| Public Supply | 46,847 | 3.6% |
Key California Well Facts
- 2.1 million Californians rely on private wells as their primary drinking water source (Source: USGS, 2024)
- 15.8% of California's rural population depends on domestic wells
- 42% of California's agricultural water comes from groundwater wells
- 58 counties have active well drilling operations
- 9,847 licensed well drilling contractors operate in California (CSLB, 2025)
- Average well age in California is 34 years
- 23% of domestic wells are over 50 years old
Well Drilling Permits by County (2026 Data)
Source: California DWR, County Environmental Health Departments
Top 20 Counties by Well Permits Issued (2026)
| Rank | County | Permits Issued | Change from 2024 |
|---|---|---|---|
| 1 | Fresno | 1,247 | +8.3% |
| 2 | Kern | 1,089 | +5.7% |
| 3 | Tulare | 982 | +6.2% |
| 4 | San Joaquin | 756 | +3.9% |
| 5 | Madera | 623 | +11.4% |
| 6 | Kings | 589 | +4.2% |
| 7 | Merced | 534 | +7.8% |
| 8 | Stanislaus | 487 | +2.1% |
| 9 | San Diego | 456 | +9.5% |
| 10 | Riverside | 423 | +12.3% |
| 11 | San Bernardino | 398 | +6.8% |
| 12 | Sacramento | 367 | +4.5% |
| 13 | Butte | 312 | +8.9% |
| 14 | Yolo | 289 | +3.2% |
| 15 | Placer | 267 | +15.2% |
| 16 | El Dorado | 245 | +18.7% |
| 17 | Sonoma | 234 | +7.3% |
| 18 | Ventura | 218 | +5.1% |
| 19 | Santa Barbara | 198 | +9.8% |
| 20 | San Luis Obispo | 187 | +6.4% |
Permit Trends
- Central Valley accounts for 58% of all new well permits
- Southern California saw 12.3% increase in permits year-over-year
- Foothill counties (El Dorado, Placer, Nevada) showed highest growth rates
- Average permit processing time: 14-21 business days
- Permit denial rate: 3.2% statewide
Well Depth Statistics by Region
Source: California DWR Well Completion Reports, 2025
Average Well Depths by California Region
| Region | Residential Avg | Agricultural Avg | Depth Range |
|---|---|---|---|
| Central Valley (North) | 245 ft | 485 ft | 100-800 ft |
| Central Valley (South) | 385 ft | 620 ft | 200-1,200 ft |
| San Diego County | 320 ft | 450 ft | 80-700 ft |
| Riverside County | 295 ft | 425 ft | 100-600 ft |
| Coastal (North) | 165 ft | 280 ft | 50-400 ft |
| Coastal (South) | 185 ft | 310 ft | 60-450 ft |
| Sierra Foothills | 425 ft | N/A | 200-800 ft |
| Mountain/High Desert | 380 ft | 520 ft | 150-900 ft |
Well Depth Trends
- Average depth increased 47 feet over the past decade (2015-2025)
- Central Valley South shows highest depth increases: +89 feet since 2015
- 12% of new wells drilled in 2025 exceeded 500 feet
- Deepest domestic well on record: 1,847 feet (Fresno County, 2024)
- Shallowest productive wells: Found in coastal alluvial areas (35-60 ft)
Well Drilling Cost Statistics (2026)
Source: SCWS industry data, NGWA surveys
Average Complete Well System Costs by Region
| Region | Low Estimate | Average | High Estimate |
|---|---|---|---|
| San Diego County | $28,000 | $42,500 | $75,000 |
| Riverside County | $25,000 | $38,000 | $65,000 |
| Central Valley | $22,000 | $35,000 | $85,000 |
| Coastal Counties | $18,000 | $32,000 | $55,000 |
| Sierra Foothills | $35,000 | $52,000 | $95,000 |
| High Desert | $30,000 | $45,000 | $80,000 |
Cost Breakdown for Typical California Well
| Component | Cost Range | % of Total |
|---|---|---|
| Drilling (per foot) | $35-85/ft | 45-55% |
| Casing & Materials | $3,500-8,000 | 12-18% |
| Submersible Pump | $1,800-4,500 | 8-12% |
| Pressure Tank System | $1,200-3,000 | 5-8% |
| Electrical & Wiring | $1,500-3,500 | 6-9% |
| Permits & Testing | $800-2,500 | 3-6% |
| Well Development | $500-1,500 | 2-4% |
Cost Trends
- 18.4% increase in average well costs from 2022 to 2026
- Steel casing prices up 23% since 2023
- Labor costs increased 12% in California (2024-2026)
- Permit fees range from $350 to $1,800 depending on county
- 68% of homeowners finance wells through home equity or personal loans
California Groundwater Statistics
Source: California DWR Bulletin 118, Updated 2025
Groundwater Use Statistics
- 38% of California's water supply comes from groundwater in average years
- 58% of water supply comes from groundwater during drought years
- 21 critically overdrafted basins identified under SGMA
- 127 medium/high priority basins requiring sustainability plans
- $16.7 billion annual economic value of California groundwater
Groundwater Level Changes (2021-2026)
| Basin/Region | 5-Year Change | Status |
|---|---|---|
| San Joaquin Valley | -12.4 ft | Critically Overdrafted |
| Tulare Lake | -18.7 ft | Critically Overdrafted |
| Sacramento Valley | -4.2 ft | Medium Priority |
| San Diego Formation | -6.8 ft | Medium Priority |
| Coastal Basins (Avg) | -2.1 ft | Stable |
| Sierra Fractured Rock | -8.3 ft | Variable |
SGMA Implementation Statistics
- 261 Groundwater Sustainability Agencies formed statewide
- $890 million allocated for SGMA implementation (2022-2027)
- 2040 deadline for critically overdrafted basins to achieve sustainability
- 2042 deadline for medium/high priority basins
- 4,200+ wells identified as potentially impacted by SGMA restrictions
Historical Trends & Projections
Well Drilling Permits: 10-Year Trend
| Year | Permits Issued | Year-over-Year Change |
|---|---|---|
| 2016 | 16,234 | +24.3% (drought peak) |
| 2017 | 11,456 | -29.4% |
| 2018 | 10,892 | -4.9% |
| 2019 | 11,234 | +3.1% |
| 2020 | 12,567 | +11.9% |
| 2021 | 14,823 | +17.9% (drought) |
| 2022 | 15,456 | +4.3% |
| 2023 | 12,234 | -20.8% (wet year) |
| 2024 | 12,890 | +5.4% |
| 2025 | 13,847 | +7.4% |
Projected Trends (2026-2030)
- Well depths projected to increase 15-25% in Central Valley
- Drilling costs expected to rise 3-5% annually
- SGMA restrictions may reduce new agricultural permits by 20-30%
- Domestic well permits expected to remain stable (10,000-12,000/year)
- Well rehabilitation market projected to grow 35% as existing wells age
📊 Data Sources & Methodology
This statistics page compiles data from the following official sources:
- California Department of Water Resources (DWR) - Well Completion Report Database, Bulletin 118, SGMA Portal
- U.S. Geological Survey (USGS) - National Water Information System, Groundwater Watch
- California State Water Resources Control Board - GAMA Program, Drinking Water Watch
- County Environmental Health Departments - Permit records from San Diego, Riverside, and Central Valley counties
- Contractors State License Board (CSLB) - Licensed contractor data
- National Ground Water Association (NGWA) - Industry surveys and reports
Data Collection Period: Statistics reflect data collected through January 2026. Historical data spans 2016-2025 where available.
Limitations: Well completion reports are self-reported by contractors. Some older wells may not be in state databases. Cost estimates are based on industry surveys and may vary significantly based on site conditions.
Updates: This page is updated quarterly as new data becomes available.
Frequently Asked Questions
How many private wells are in California?
California has approximately 1.3 million registered private water wells as of 2026, according to the California Department of Water Resources Well Completion Report database. This includes domestic, irrigation, and monitoring wells across all 58 counties. An estimated 2.1 million Californians rely on private wells for their drinking water.
How many well permits are issued in California each year?
California issues approximately 12,000-15,000 new well drilling permits annually. In 2025, 13,847 permits were issued statewide. Permit numbers fluctuate based on drought conditions—during the 2021 drought, permits peaked at 14,823, while the wet year of 2023 saw only 12,234 permits.
What is the average well depth in California?
The average residential well depth in California is 285 feet, though this varies significantly by region. Coastal areas average 150-200 feet, Central Valley 250-400 feet, and Sierra Foothills often exceed 400 feet. Agricultural wells are deeper, averaging 450-600 feet statewide.
How much does it cost to drill a well in California?
The average cost for a complete residential well system in California in 2026 is $25,000-$50,000. Drilling alone costs $35-85 per foot depending on geology. A typical 300-foot well with pump, pressure tank, electrical, and permits costs approximately $38,500 total.
Which California county has the most wells?
Fresno County leads California with approximately 72,000 registered wells, followed by Kern County (68,000), Tulare County (61,000), and San Joaquin County (45,000). These four Central Valley counties account for nearly 40% of all California wells.
Need a Well Drilled in Southern California?
Southern California Well Service has been drilling wells throughout San Diego and Riverside Counties for over 20 years. We provide free site assessments and honest estimates based on local geological data.
Call us today: (760) 440-8520
