Well Drilling Ontario, California
Need a well drilled in Ontario? Agricultural, commercial & residential well experts.
📋 In This Guide
- Contents
- Professional Well Drilling in Ontario
- Understanding the Chino Basin
- How Deep Are Wells in Ontario?
- Well Drilling Costs in Ontario
- Agricultural Wells in Ontario
- Commercial & Industrial Wells
- Residential Wells in Ontario
- Permits & Basin Management
- Our Ontario Well Services
- Frequently Asked Questions
- Get Started on Your Ontario Well Project
Professional Well Drilling in Ontario
Ontario sits at the heart of the Inland Empire, where Southern California's agricultural heritage meets modern commercial development. The city overlies the Chino Groundwater Basin — one of the region's most productive aquifer systems.
Southern California Well Service provides well drilling throughout Ontario and San Bernardino County. We specialize in agricultural wells, commercial/industrial wells, and residential systems for properties outside municipal water service areas.
Why Ontario Properties Need Wells
- Agricultural irrigation — Dairy farms, vineyards, citrus groves, nurseries
- Commercial operations — Warehouses, manufacturing, processing plants
- Industrial water supply — Food processing, concrete plants, cooling systems
- Backup water source — Redundancy for critical operations
- Rural residential — Properties outside municipal water zones
- Cost savings — Avoid municipal water rates for large users
Understanding the Chino Basin
The Chino Groundwater Basin underlies Ontario and neighboring cities. It's managed by the Chino Basin Watermaster and contains significant groundwater resources developed over decades.
Basin Characteristics
| Feature | Details |
|---|---|
| Basin area | ~235 square miles |
| Storage capacity | ~6.3 million acre-feet |
| Aquifer type | Alluvial (sand, gravel, clay layers) |
| Water table depth | 100-300 feet (varies by location) |
| Recharge sources | Santa Ana River, spreading basins, imported water |
Water Quality in the Chino Basin
Water quality varies across the basin:
- Northern Ontario — Generally good quality, lower TDS
- Southern/central areas — Higher nitrates in some zones (historical agricultural impacts)
- Near dairies — Elevated nitrates possible; testing essential
- Perchlorate — Present in some areas; requires treatment for potable use
We provide comprehensive water quality testing and can recommend treatment systems as needed.
How Deep Are Wells in Ontario?
Ontario wells tap into multiple aquifer zones within the Chino Basin alluvium. Depth depends on location, intended use, and water quality requirements.
Typical Well Depths
| Well Type | Typical Depth | Notes |
|---|---|---|
| Residential | 250-400 ft | Adequate for home use (5-15 GPM) |
| Small agricultural | 300-450 ft | Irrigation, livestock (25-100 GPM) |
| Large agricultural | 400-600 ft | High capacity (200-500+ GPM) |
| Commercial | 350-500 ft | Variable based on demand |
| Industrial | 400-700 ft | Large diameter, high yield |
Aquifer Zones
The Chino Basin has multiple productive zones:
- Shallow zone (100-200 ft) — Limited use; may have quality issues
- Intermediate zone (200-400 ft) — Most common target for residential/small ag
- Deep zone (400-700+ ft) — Higher capacity, often better quality
Well Drilling Costs in Ontario
Costs vary significantly based on well type, depth, and system requirements.
Residential Well Costs
| Component | Cost Range |
|---|---|
| Drilling (per foot) | $45-75 |
| Casing (per foot) | $18-30 |
| Pump system | $3,500-8,000 |
| Pressure tank | $800-2,000 |
| Electrical | $1,000-3,000 |
| Total (300 ft well) | $22,000-$40,000 |
Agricultural Well Costs
| Capacity | Typical Total Cost |
|---|---|
| Small (25-50 GPM) | $30,000-$55,000 |
| Medium (100-200 GPM) | $55,000-$90,000 |
| Large (300-500 GPM) | $85,000-$150,000 |
Commercial/Industrial Wells
Commercial well costs depend heavily on specifications:
- Basic commercial: $50,000-$100,000
- High-capacity industrial: $100,000-$300,000+
- With treatment systems: Add $20,000-$100,000
Free Estimates: We provide detailed proposals after site evaluation. No surprises, no hidden costs. Call (760) 440-8520
Agricultural Wells in Ontario
Ontario's agricultural heritage includes dairy operations, citrus groves, vineyards, and nurseries. Many farms rely on private wells for irrigation and livestock water.
Agricultural Applications
- Dairy operations — Drinking water, washdown, cooling
- Nurseries/greenhouses — Irrigation, misting systems
- Vineyards — Drip irrigation, frost protection
- Citrus groves — Flood or drip irrigation
- Row crops — Sprinkler or drip systems
- Equestrian facilities — Arena watering, horse care
Sizing Agricultural Wells
| Acreage | Typical GPM Needed | Well Diameter |
|---|---|---|
| 1-5 acres | 25-75 GPM | 6-8 inch |
| 5-20 acres | 75-200 GPM | 8-10 inch |
| 20-50 acres | 200-400 GPM | 10-14 inch |
| 50+ acres | 400-1,000+ GPM | 14-18 inch |
Irrigation System Integration
We design well systems to integrate with your irrigation:
- Drip systems — Lower GPM, higher pressure requirements
- Sprinkler systems — Moderate GPM and pressure
- Flood irrigation — High GPM, low pressure
- Variable frequency drives — Optimize pump efficiency
Commercial & Industrial Wells
Ontario's industrial base includes warehouses, manufacturing, food processing, and distribution centers. Many operations benefit from private well water supply.
Commercial Applications
- Warehouse cooling — HVAC, evaporative cooling
- Food processing — Production water, cleaning
- Concrete/construction — Batch plants, dust control
- Landscaping businesses — Irrigation supply
- Car washes — High-volume water needs
- Backup supply — Business continuity
Industrial Requirements
Industrial wells often require:
- High capacity — 100-1,000+ GPM
- Large diameter — 12-20 inch casing
- Water treatment — Based on use requirements
- Redundancy — Multiple wells or backup systems
- Monitoring systems — Level, flow, quality sensors
Cost-Benefit Analysis
For large water users, private wells often provide significant savings:
| Usage (GPM) | Annual Municipal Cost | Annual Well Cost | Savings |
|---|---|---|---|
| 50 GPM (continuous) | ~$75,000 | ~$8,000 | $67,000/year |
| 100 GPM (continuous) | ~$150,000 | ~$12,000 | $138,000/year |
| 200 GPM (continuous) | ~$300,000 | ~$18,000 | $282,000/year |
Well costs include electricity and maintenance. Municipal rates based on typical Inland Empire commercial rates.
Residential Wells in Ontario
While most Ontario residents use municipal water, some properties — particularly in rural areas or on larger lots — rely on private wells.
When Residential Wells Make Sense
- No municipal connection available
- Large lot irrigation — Cost-effective for 1+ acre landscapes
- Pool/spa water — Avoid municipal rates for filling
- Backup supply — Drought or supply disruptions
- Agricultural hobby — Gardens, small livestock
Residential Well Requirements
| Use | GPM Needed | Tank Size |
|---|---|---|
| Household only | 5-10 GPM | 40-80 gallon |
| Household + irrigation | 10-20 GPM | 80-120 gallon |
| Large property | 20-50 GPM | 120+ gallon |
Permits & Basin Management
Drilling in Ontario requires permits from San Bernardino County Environmental Health. The Chino Basin is also subject to Watermaster management, which may affect large users.
Permit Requirements
- Well construction permit — Required before drilling
- Site plan — Showing well location and setbacks
- Setback compliance — From septic, property lines, buildings
- Abandonment — Old wells must be properly destroyed
- Completion report — Filed after drilling
Chino Basin Watermaster
For large-volume pumpers (typically 10+ acre-feet/year):
- May need to obtain pumping rights or participate in assessment program
- Reporting requirements for production volumes
- Possible replenishment charges
We help navigate Watermaster requirements and can advise on your specific situation.
We Handle Permitting
Southern California Well Service manages the entire permit process:
- Application preparation and filing
- Coordination with county inspectors
- Completion report submission
- Watermaster coordination if applicable
Our Ontario Well Services
New Well Drilling
- Site evaluation — Assess location, review well logs, determine feasibility
- Permit handling — San Bernardino County DEH
- Drilling — Air rotary or mud rotary methods
- Casing and screening — Properly sized for your needs
- Well development — Maximize production capacity
- Yield testing — Determine sustainable pumping rate
- Water quality testing — Full laboratory analysis
Pump Systems
- Submersible pumps — Residential to large agricultural
- Turbine pumps — High-capacity industrial applications
- Variable frequency drives — Energy efficiency optimization
- Booster systems — Increase pressure for irrigation
Existing Well Services
- Pump repair/replacement
- Well rehabilitation — Restore declining production
- Video inspection — Assess well condition
- Water quality treatment
- System upgrades
Frequently Asked Questions
How deep are wells in Ontario, CA?
Wells in Ontario typically range from 250-500 feet deep for residential and small agricultural use. Large agricultural and industrial wells may go 400-700 feet to access higher-capacity aquifer zones in the Chino Basin.
What does it cost to drill a well in Ontario?
Residential wells typically cost $20,000-$55,000. Agricultural wells range from $30,000-$150,000 depending on capacity needs. Commercial and industrial wells vary widely based on specifications.
Can I drill a private well in Ontario, CA?
Yes, private wells are permitted in Ontario. You'll need a permit from San Bernardino County Environmental Health. For large-volume use, coordination with the Chino Basin Watermaster may be required.
How long does it take to drill a well in Ontario?
Drilling typically takes 3-7 days depending on depth and conditions. Total project completion including permits, pump installation, and testing usually takes 3-6 weeks.
What is the water quality like in Ontario wells?
Quality varies by location. Some areas have excellent water quality; others may have elevated nitrates or perchlorate requiring treatment. We always recommend comprehensive testing and can design treatment systems as needed.
Do you service existing wells in Ontario?
Yes, we provide pump repair, well rehabilitation, video inspection, and system upgrades for existing wells throughout Ontario and the Inland Empire.
Get Started on Your Ontario Well Project
Whether you need an agricultural well for your farm, a commercial well for your business, or a residential well for your property, Southern California Well Service has the expertise to deliver reliable water solutions in Ontario.
Free site evaluations and detailed estimates — no obligation.
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