Well Drilling San Diego County | Licensed Drilling Contractor

Residential Water Wells: Complete well systems for homes, cabins, and vacation properties. We drill wells from 100 to 800+ feet deep, sized appropriately for household water needs (typically 5-15 GPM flow rate). Our residential well packages include drilling, casing, well development, submersible pump installation, pressure tank, electrical controls, water quality testing, and all required permits.

Agricultural Wells: High-capacity wells for ranches, farms, vineyards, and agricultural operations. Agricultural wells typically require larger diameters (8-10 inches vs. 6 inches for residential) and higher flow rates (15-50+ GPM). We understand the unique demands of agricultural water systems—livestock watering, irrigation scheduling, seasonal variations, and cost-per-acre-foot economics.

Commercial Wells: Water wells for businesses, industrial facilities, and commercial properties. From small business operations to large commercial developments, we design and drill wells meeting your specific flow and quality requirements.

Replacement Wells: When an existing well fails due to age, contamination, or inadequate flow, we drill replacement wells. We evaluate why the original well failed and choose better locations or depths for the new well. Our experience drilling thousands of San Diego County wells means we know where to find water on your property.

Monitoring Wells: Environmental monitoring wells for soil and groundwater testing, contamination assessment, and regulatory compliance. These specialized wells require precise depth control and careful construction to avoid cross-contamination between aquifers.

Geothermal Wells: Shallow to medium-depth wells for geothermal heat pump systems. Geothermal wells provide sustainable heating and cooling by utilizing constant underground temperatures.

• Rotary Drilling Rigs: Our primary drilling method for most San Diego County wells. Rotary rigs use rotating drill bits with drilling mud or air to cut through rock and soil. These rigs can drill efficiently through granite, decomposed granite, sandstone, and mixed formations common in San Diego. We operate rigs capable of drilling 1,000+ feet deep and handling 6-10 inch diameter wells.
• Air Rotary Systems: For hard rock formations and areas where water-based drilling mud isn't practical, we use compressed air rotary drilling. Air rotary is faster in hard granite and provides excellent cuttings removal, allowing us to identify water-bearing fractures during drilling.
• Mud Rotary Systems: For softer formations, alluvial deposits, and areas requiring borehole stabilization, we use bentonite-based drilling mud. Mud rotary prevents borehole collapse in unconsolidated formations and provides excellent geological sampling.
• Truck-Mounted Rigs: Our standard rigs are truck-mounted for efficient mobilization and setup. These rigs can access most residential and agricultural properties with reasonable road access.
• Compact Rigs: For properties with limited access, steep terrain, or tight spaces, we have smaller rigs that can navigate challenging sites while still drilling to required depths.
• Support Equipment: We maintain air compressors, mud pumps, casing hammers, well development equipment, pump installation tools, and all necessary support equipment. We don't rent or borrow critical equipment—we own what we need.

• Property visit: We inspect your property to identify the best well location considering setback requirements, access for drilling equipment, proximity to house and electrical service, and future maintenance access.
• Geological research: We review geological maps, neighboring well data from California's OSWCR (Online System for Well Completion Reports), and our own database of thousands of wells we've drilled in the area.
• Water table assessment: We estimate the depth to water based on area geology, elevation, and nearby well data.
• Access evaluation: We verify our drilling rig can safely access the proposed location, considering slope, soil stability, overhead clearance, and turning radius.
• Utility clearance: We identify underground utilities (septic, electrical, gas, water, telecommunications) and coordinate with Underground Service Alert (811) for utility marking.
• Setback compliance: We verify the proposed well location meets San Diego County setback requirements (typically 50-100 feet from property lines, 100+ feet from septic systems, 50+ feet from buildings).

Deliverable: Written estimate including estimated depth range, expected costs, timeline, and proposed well location marked on property map.

• Application preparation: We complete the well construction permit application including property information, proposed well specifications, geological assessment, and site plans.
• Submission: Application is submitted to San Diego County Department of Environmental Health (DEH) with required fees ($1,500-$2,500 depending on well type).
• Review process: DEH reviews for compliance with setbacks, geological suitability, and environmental considerations. Processing typically takes 4-8 weeks.
• Approval: Once approved, we receive the well construction permit authorizing drilling to begin.
• Special requirements: Some areas require additional geological reports, environmental assessments, or California Environmental Quality Act (CEQA) review, which extends timelines.

Timeline: 4-8 weeks for standard permits; 8-16 weeks for permits requiring environmental review.

• Site clearing: We clear vegetation and obstacles from the drilling location and create a level pad for the drilling rig (typically 30x40 feet).
• Access preparation: If necessary, we improve access roads to support heavy equipment (drilling rig, water truck, crane for pump installation).
• Rig mobilization: Our drilling rig is transported to the site and positioned over the approved well location.
• Setup and leveling: The rig is precisely leveled and stabilized using outriggers or jacks. A level rig is critical for straight, vertical drilling.
• Safety measures: We establish safety perimeter, post warning signs, and brief any on-site personnel about drilling operations.
• Utilities verification: Final verification that underground utilities are marked and clear of drilling location.

Timeline: 1-2 days for site preparation and rig setup.

Drilling Method Selection:

• Mud Rotary: Used for softer formations, alluvial deposits, and sedimentary rocks. Bentonite drilling mud circulates down the drill pipe, through the bit, and back up the annular space, carrying rock cuttings to the surface while stabilizing the borehole.
• Air Rotary: Used for hard rock formations like granite. Compressed air is forced down the drill pipe and blasts cuttings out of the hole. Air rotary is faster in hard rock and allows us to hear water flowing into the hole during drilling.
• Combination drilling: Many San Diego wells require both methods—mud rotary through surface soils and alluvium, then switching to air rotary when hitting hard granite bedrock.

Drilling Progress:

• Drilling advances in 10-20 foot sections, adding new sections of drill pipe as depth increases.
• We continuously monitor drill cuttings to identify geological formations and water-bearing zones.
• When water is encountered, we note the depth and continue drilling to ensure adequate well yield.
• Drilling rate varies dramatically by formation: 50-100 feet/day in soft decomposed granite or alluvium; 20-40 feet/day in hard granite; 100+ feet/day in sedimentary formations.
• We drill until hitting productive water zones with adequate flow for your needs, even if that exceeds the originally estimated depth.

Water Zones & Testing:

• As drilling progresses, we perform periodic "blow tests" (for air rotary) or bail tests (for mud rotary) to estimate water flow rate.
• We may encounter multiple water zones at different depths. The goal is finding a zone (or combination of zones) providing adequate flow.
• Target flow rates: 5-10 GPM minimum for residential wells; 15-30+ GPM for agricultural wells; 30-100+ GPM for commercial wells.
• If initial water zones are insufficient, we drill deeper seeking higher-yielding fractures or aquifers.

Timeline: 2-5 days for most residential wells (200-500 feet deep); longer for deep wells or slow drilling conditions.

Casing Material & Specifications:

• Material: We use steel casing (most common for deep wells and hard rock) or schedule 40/80 PVC casing (for shallower wells in stable formations). Steel casing is required in most San Diego County granite wells.
• Diameter: Residential wells typically use 6-inch casing; agricultural and high-capacity wells use 8-10 inch casing.
• Length: Surface casing extends from ground level to bedrock (typically 20-80 feet). Production casing extends from bedrock to total well depth.
• Perforations/Screen: Casing is perforated or screened at water-bearing zones to allow water entry while preventing sand and fine material from entering the well.

Casing Installation Process:

• Casing sections are joined (welded for steel, threaded or glued for PVC) and lowered into the borehole.
• Casing must be perfectly vertical and centered in the borehole.
• A tremie pipe is used to pump cement grout into the annular space between the borehole wall and casing.
• Grouting prevents surface water and contaminants from entering the well and seals off non-productive zones.
• Surface seal requirements per California Well Standards: cement/bentonite grout from surface to at least 50 feet depth (deeper in some formations).

Timeline: 1 day for casing installation; 1-2 days for grout curing before proceeding to development.

Development Methods:

• Air lifting: Compressed air is injected deep in the well, creating a rising column of air and water that flushes sediment out of the well.
• Surge and bail: A surge block is rapidly raised and lowered in the well, creating pressure pulses that loosen sediment from fractures and screens.
• High-velocity jetting: High-pressure water jets are directed at screened zones to clean perforations and remove drilling residue.
• Overpumping: Pumping the well at rates higher than planned production rate to draw fine material out of the formation.
• Combination approach: We typically use multiple development methods in sequence for best results.

Development Goals:

• Clear water—development continues until pumped water runs clear without sediment.
• Maximum flow rate—properly developed wells often yield 20-50% more water than undeveloped wells.
• Stable drawdown—the water level in the well stabilizes during pumping rather than continuously declining.
• Sand-free production—development removes fine sand and silt that would damage pumps.

Timeline: 0.5-2 days depending on well depth, formation type, and initial water clarity. We don't rush development—it's essential for long-term well performance.

Pump Selection & Sizing:

• Flow rate matching: The pump is sized to match your water demand without exceeding the well's sustainable yield. Over-pumping causes excessive drawdown, sand pumping, and premature pump failure.
• Total Dynamic Head (TDH) calculation: We calculate TDH = pumping water level + elevation rise to delivery point + pressure required + friction losses in piping. This determines required pump horsepower.
• Pump selection: We use high-quality submersible pumps (Grundfos, Franklin, Goulds) sized for your specific TDH and flow requirements. Residential wells typically use 0.5-2 HP pumps; agricultural and commercial wells may need 3-15+ HP.
• Stainless steel components: We specify stainless steel pump housings and impellers for corrosive or high-mineral water.

Pump Installation Process:

• Drop pipe installation: Schedule 80 PVC or HDPE pipe is attached to the pump and extends from the pump (set 50-100+ feet below static water level) to the wellhead.
• Safety cable: A stainless steel safety cable is attached to the pump and secured at the wellhead to prevent the pump from falling if the drop pipe fails.
• Electrical wiring: Submersible pump cable is run down the well alongside the drop pipe and connected to the pump motor. The cable is secured to the drop pipe with cable guards every 10-20 feet.
• Torque arrestor: A torque arrestor or stabilizer prevents the pump from spinning during startup.
• Check valve: A check valve is installed above the pump to prevent backflow and water hammer.
• Pump setting depth: Pumps are set deep enough to ensure submersion even during maximum drawdown, typically 50-100+ feet below static water level depending on well yield and pumping rate.

Timeline: 1 day for pump installation in typical residential wells; 1-2 days for deep wells or large commercial pumps.

System Components:

• Pressure tank: A pre-charged bladder or diaphragm pressure tank stores water under pressure and reduces pump cycling. Residential systems typically use 40-80 gallon tanks; larger systems may need 120+ gallon tanks or multiple tanks.
• Pressure switch: Automatically starts and stops the pump based on system pressure (typical settings: 40/60 PSI for residential, 30/50 PSI for irrigation-focused systems).
• Pressure gauge: Allows you to monitor system pressure at a glance.
• Control box: For 3-wire submersible pumps, a control box with capacitors and overload protection manages pump operation.
• Low water cutoff: Optional protection that shuts off the pump if the well water level drops too low, preventing pump damage from dry running.
• Cycle counter: Optional device tracking pump starts to predict maintenance needs.
• Well seal: A sanitary well seal caps the well casing, preventing surface water and contaminants from entering while providing access for pump removal.

Electrical Service:

• Most residential well pumps require 230V electrical service (0.5-2 HP pumps typically draw 5-12 amps).
• Larger pumps (3+ HP) may require 230V 3-phase service or special 460V configurations.
• We coordinate with electricians to ensure proper electrical service to the well location (underground conduit from main panel to wellhead).
• Electrical installation must comply with National Electrical Code and local requirements.

Timeline: 1 day for pressure tank, controls, and electrical connections.

Standard Water Tests:

• Bacterial analysis: Testing for total coliform and E. coli bacteria (required for all new wells).
• Mineral analysis: Total dissolved solids (TDS), hardness, iron, manganese, sulfates, chlorides, and other dissolved minerals.
• Nitrates: Critical for homes with infants or pregnant women—nitrates over 10 ppm are unsafe for infants.
• pH and alkalinity: Affects corrosion potential and treatment equipment performance.
• Arsenic: Naturally occurring in some San Diego County areas, particularly in older sedimentary formations.

Optional Testing (recommended based on location):

• Uranium (common in granite formations)
• Radon (volatile gas in groundwater)
• Fluoride (naturally occurring in some areas)
• Heavy metals (lead, chromium, mercury)
• Volatile organic compounds (VOCs) if near industrial areas or gas stations
• Pesticides/herbicides if in agricultural areas

Water samples are collected using sterile technique and sent to a certified laboratory. Results typically return in 5-10 days. We review results with you and recommend any necessary treatment systems (water softeners for hardness, iron filters, UV disinfection for bacteria, reverse osmosis for arsenic/nitrates, etc.).

Timeline: Sample collection: 1 day; lab results: 5-10 days.

• County inspection: San Diego County DEH inspects the completed well to verify compliance with permit conditions and California Well Standards. The inspector verifies proper casing installation, surface seal, well seal, setback compliance, and construction quality.
• Well completion report: We file a detailed Well Completion Report with the county and California Department of Water Resources. This report documents total well depth, casing specifications, depth to water, estimated yield, geological formations encountered, and all construction details.
• Water rights documentation: In some areas, well completion triggers water rights registration or reporting requirements.
• Completion certificate: Once inspection passes and reports are filed, you receive a certificate of completion allowing legal use of the well.
• Property documentation: The well completion report becomes a permanent property record. Future buyers, appraisers, and mortgage companies will reference this document. Keeping a copy with your property records is essential.
• Warranty: SCWS provides written warranty coverage on drilling work, materials, and pump installation (typical coverage: 1 year on labor, manufacturer warranty on equipment).
• Owner orientation: We explain system operation, routine maintenance requirements, what to watch for, and emergency contact procedures.

Timeline: 1-2 weeks for inspection scheduling and report filing.

• Site survey and geological assessment
• Permit application and fees ($1,500-$2,500)
• Mobilization and demobilization of drilling rig
• Rotary drilling to estimated depth (price per foot)
• Well casing (steel or PVC, diameter appropriate for application)
• Casing centralizers and grout for proper well seal
• Well development (air lifting, surging, jetting as needed)
• Submersible pump and motor (HP sized for your well and demand)
• Drop pipe (Schedule 80 PVC or HDPE)
• Safety cable and torque arrestor
• Submersible pump cable (length appropriate for pump depth)
• Check valve (prevents backflow)
• Sanitary well seal (watertight cap)
• Pressure tank (40-120 gallon depending on system size)
• Pressure switch and gauge
• Control box (for 3-wire pumps)
• Electrical connections at wellhead
• Basic water quality testing (bacteria, minerals)
• Well completion report filed with county and state
• Final inspection coordination
• Warranty on labor and materials

• Electrical service from house to well location: $2,000-$8,000 depending on distance and whether trenching or boring is required. This must be done by a licensed electrician and inspected separately.
• Road improvements or access work: If our drilling rig can't safely access the approved well location, road grading, widening, or reinforcement may be needed ($1,000-$5,000+ depending on scope).
• Specialized geological reports: Some environmentally sensitive areas require professional geological or hydrological reports ($2,000-$8,000).
• Extended depth drilling: If we drill beyond estimated depth seeking adequate water, additional drilling costs apply at the per-foot rate. We discuss this with you before proceeding deeper.
• Water treatment systems: If testing reveals water quality issues (high hardness, iron, bacteria, arsenic), treatment equipment costs extra: water softeners ($1,500-$3,000), iron filters ($1,200-$2,500), UV disinfection ($600-$1,200), reverse osmosis ($2,500-$6,000+).
• Storage tanks: For low-yield wells or properties with high peak demand, water storage tanks provide buffering: 2,500-gallon poly tank ($1,500-$2,500), concrete tanks ($3,000-$10,000+), booster pump systems ($1,500-$4,000).
• Landscaping restoration: We restore the drilling site to rough grade, but final landscaping, reseeding, or hardscaping is customer responsibility.

Drilling Speed by Formation Type:

• Alluvial deposits (gravel, sand, clay): 80-150 feet/day drilling speed—fast and easy. Found in valley floors and near stream channels. Cost per foot: $50-65.
• Decomposed granite ("DG"): 60-100 feet/day drilling speed—relatively soft and easy to drill. Common in inland valleys and foothills. Cost per foot: $55-70.
• Moderately weathered granite: 40-60 feet/day drilling speed—harder but still reasonable. Widespread throughout San Diego backcountry. Cost per foot: $65-85.
• Hard granite (fresh, unweathered): 20-40 feet/day drilling speed—slow, abrasive, wears down drilling bits rapidly. Found in mountain areas and deep formations. Cost per foot: $80-110.
• Metasedimentary rocks: 30-50 feet/day drilling speed—variable hardness. Found in certain backcountry areas. Cost per foot: $70-95.
• Basalt and volcanic rocks: 25-45 feet/day drilling speed—very hard and abrasive. Found in parts of eastern San Diego County. Cost per foot: $75-105.

Drilling through 300 feet of decomposed granite might take 3-4 days and cost $20,000, while drilling 300 feet through hard granite could take 7-8 days and cost $30,000+. You're drilling into geology you can't see until the bit encounters it, which is why experienced local drillers review geological maps and neighboring well data before estimating costs.

• Easy access (paved driveway, level site): No additional cost. Our rigs can drive directly to the well location and set up within a few hours.
• Moderate access (gravel road, mild slope): Minor additional cost ($500-$1,500) for extra setup time and stabilization.
• Difficult access (steep unpaved road, significant slope): $1,500-$4,000 additional for road improvement, specialized equipment, or using smaller rigs with slower drilling rates.
• Extreme access (no road, very steep terrain, remote location): $4,000-$10,000+ additional. May require helicopter delivery of equipment (rare), extensive road building, or use of specialized small-diameter drilling rigs.
• Urban tight spaces (limited access, overhead wires, confined area): $1,000-$3,000 additional for smaller rigs or specialized rigging to navigate around obstacles.

• 6-inch diameter (standard residential): Baseline cost. Adequate for most homes (5-15 GPM systems).
• 8-inch diameter (agricultural/high-capacity residential): Add 20-30% to drilling and casing costs. Allows larger pumps and higher flow rates (15-40 GPM systems).
• 10-inch diameter (agricultural/commercial): Add 40-60% to drilling and casing costs. Supports very high flow rates (40-100+ GPM systems).
• 12+ inch diameter (municipal/industrial): Add 80-120%+ to costs. Rarely needed for private property wells.

Larger diameter wells drill more slowly (bigger hole to excavate), use more casing material, and require larger drilling rigs.

• Standard permit: $1,500-$2,500, 4-8 weeks processing
• Environmental review areas: Add $2,000-$5,000 for biological surveys, archaeological clearance, or habitat assessments; add 4-12 weeks to timeline
• Special geological areas: Add $2,000-$6,000 for professional geologist reports on fault zones, landslide areas, or seismic hazard zones
• Water scarce areas: Some basin areas require hydrogeological studies proving your well won't impact neighboring wells—add $3,000-$8,000 and 8-16 weeks
• Agricultural preserve properties: May require additional county agricultural commissioner review

• 0.5 HP submersible pump: $600-$1,000 (for very shallow wells or low demand)
• 0.75 HP submersible pump: $800-$1,200 (typical for shallow residential wells)
• 1 HP submersible pump: $900-$1,400 (most common residential size)
• 1.5 HP submersible pump: $1,200-$1,800 (deeper residential wells)
• 2 HP submersible pump: $1,500-$2,200 (deep residential or small agricultural)
• 3-5 HP submersible pump: $2,500-$4,500 (agricultural, commercial)
• 7.5-15 HP submersible pump: $4,000-$8,000+ (large agricultural/commercial operations)
• Stainless steel pumps: Add 30-50% for corrosion resistance in high-mineral or aggressive water

• Under 100 feet: $2,000-$3,500 for trenching and electrical service
• 100-200 feet: $3,500-$5,500
• 200-400 feet: $5,500-$9,000
• 400+ feet: $9,000-$15,000+ (may require transformer or voltage step-up)

Electrical work must be performed by a licensed electrician and pass county electrical inspection separately from the well permit inspection.

1. Peninsular Ranges Batholith (Granite)

The dominant geological feature of San Diego County is the Peninsular Ranges Batholith—a massive body of granitic rock formed 80-120 million years ago when molten magma cooled deep underground. This granite formation covers most of central and eastern San Diego County.

• Where found: Ramona, Alpine, Julian, Descanso, Pine Valley, most backcountry areas
• Well implications: Water is found in fractures within the granite, not in pore spaces. Your well must intersect water-bearing fractures to produce water. Yields are unpredictable—some wells hit excellent fractures with 20+ GPM; others find minimal fracturing and produce only 2-5 GPM.
• Drilling characteristics: Fresh granite is extremely hard and slow to drill. Decomposed granite (granite that has weathered to a soft, sandy consistency) drills much faster and is common in the upper 50-200 feet. Most wells penetrate both decomposed granite (upper zone) and hard granite (deeper).
• Typical depth: 200-600 feet, depending on elevation and specific location within the batholith
• Water quality: Generally excellent—granite aquifers produce clean water with moderate mineral content. However, granite areas can have naturally occurring uranium and fluoride.

2. Coastal Sedimentary Formations

Along the coast and in western San Diego County, marine sedimentary rocks dominate—sandstones, siltstones, and shales deposited when this area was underwater millions of years ago.

• Where found: Coastal areas from Oceanside to Imperial Beach, western valleys (San Pasqual, San Dieguito)
• Well implications: Water is found in porous sandstone layers and fractured zones. These formations generally provide more predictable yields than granite, as water is stored in the rock's pore spaces rather than relying solely on fractures.
• Drilling characteristics: Softer than granite—faster drilling with less equipment wear. However, unconsolidated sands can cause borehole instability requiring careful casing and grouting.
• Typical depth: 100-400 feet depending on specific formation and location
• Water quality: Variable. Coastal aquifers risk saltwater intrusion in overdrafted areas. Some sedimentary formations have elevated TDS, arsenic, or other minerals. Testing is critical.

3. Alluvial Deposits

Valley floors and stream channels have accumulated thick deposits of gravel, sand, and clay eroded from surrounding mountains—these are alluvial deposits.

• Where found: Valley bottoms in Ramona Valley, Santa Maria Valley, Santa Ysabel Valley, Warner Valley, major stream channels
• Well implications: Alluvial aquifers are among the most productive in San Diego County, often yielding 20-50+ GPM from relatively shallow depths. Water is stored in the spaces between gravel and sand particles.
• Drilling characteristics: Fast, easy drilling through unconsolidated material. However, proper casing and screen selection is critical to prevent sand pumping.
• Typical depth: 50-250 feet—alluvium depth varies from a few feet to several hundred feet depending on valley geometry
• Water quality: Good to excellent, though vulnerable to surface contamination if well construction isn't proper. Alluvial aquifers can have higher nitrates if impacted by agricultural runoff.

4. Volcanic Rocks

Small areas of eastern San Diego County have volcanic rocks—basalt flows, volcanic tuff, and related formations.

• Where found: Parts of Julian area, eastern backcountry
• Well implications: Water is found in fractures, vesicles (gas bubbles), and between lava flows. Yields are variable but can be excellent where fractures are well-connected.
• Drilling characteristics: Basalt is extremely hard and abrasive—slow drilling with high bit wear. Volcanic tuff is softer and drills more easily.
• Typical depth: 200-500 feet
• Water quality: Generally good, though some volcanic rocks contribute elevated iron or manganese

5. Metasedimentary Rocks

In some areas, ancient sedimentary rocks have been metamorphosed (altered by heat and pressure) into harder rocks like schist, quartzite, and slate.

• Where found: Scattered throughout backcountry, often as "roof pendants" within the granite batholith
• Well implications: Water in fractures, similar to granite. Yields are unpredictable.
• Drilling characteristics: Variable hardness; some schists drill easily while quartzite is extremely hard
• Typical depth: 250-600 feet
• Water quality: Usually good, though mineral content varies by specific rock type

Purpose: Provide water for homes, cabins, and vacation properties

Typical specifications:

• Diameter: 6 inches (most common)
• Depth: 200-600 feet in San Diego County (varies by area)
• Target flow rate: 5-15 GPM (adequate for household demand)
• Pump size: 0.75-2 HP submersible pump
• System pressure: 40-60 PSI delivered at house

Considerations: Residential wells must comply with domestic well standards including proper surface sealing to prevent contamination, setback requirements from septic systems (100+ feet), and water quality testing for bacteria and nitrates. Many lenders require well flow testing and water quality certification before approving mortgages on properties with wells.

For detailed information on residential well costs and how they affect property value, see our guide on how well water impacts property value.

Purpose: Provide water for ranches, farms, vineyards, orchards, and agricultural operations

Typical specifications:

• Diameter: 8-10 inches (to accommodate larger pumps and higher flow rates)
• Depth: 200-600 feet (same general range as residential, but larger diameter wells can drill deeper more efficiently)
• Target flow rate: 15-100+ GPM depending on operation size
• Pump size: 3-15+ HP submersible pump
• System pressure: Variable—30-60 PSI depending on irrigation system requirements

Considerations: Agricultural wells prioritize flow rate over residential wells. Livestock operations need reliable flow year-round. Irrigation systems have seasonal peaks. Water quality standards are different for livestock vs. human consumption. Some agricultural areas have groundwater management regulations requiring metering and reporting of water use.

Purpose: Provide water for businesses, industrial facilities, commercial developments, and institutional properties

Typical specifications:

• Diameter: 8-12+ inches
• Depth: Varies by location and demand
• Target flow rate: 30-200+ GPM
• Pump size: 7.5-30+ HP (often requiring 3-phase electrical service)

Considerations: Commercial wells often have stricter permitting requirements, may require California Department of Public Health oversight if serving public water systems, and typically need professional engineering design. Commercial well systems often include backup pumps, emergency power, sophisticated controls, and monitoring systems.

Purpose: Replace failed, contaminated, or inadequate existing wells

Common reasons for replacement:

• Failing yield: Old wells often decline in production as fractures clog with mineral deposits or as regional water tables drop
• Contamination: Nitrates, bacteria, arsenic, or other contaminants making water unsafe or unsuitable
• Structural failure: Collapsed casing, corroded screens, failed grout seal
• Insufficient capacity: Original well was adequately sized when drilled but property use has increased (more residents, added irrigation, livestock)
• Poor original construction: Some older wells were drilled before modern standards and lack proper sealing or casing

Replacement approach: We evaluate why the original well failed and choose a better location (if contamination or geological issues) or drill deeper (if original well was too shallow). Replacement wells often benefit from modern drilling technology and better understanding of local aquifers than when the original well was drilled 20-50 years ago.

Purpose: Monitor groundwater levels, water quality, or environmental contamination

Applications:

• Environmental contamination assessment and remediation monitoring
• Groundwater basin management and monitoring
• Construction dewatering projects
• Research and scientific studies
• Regulatory compliance for industrial facilities

Specifications: Monitoring wells are constructed to precise depths targeting specific aquifer zones. They use specialized screen intervals and require careful construction to avoid cross-contamination between aquifers. Monitoring wells are usually 2-4 inches in diameter and don't have pumps (water levels are measured manually or with data loggers).

Purpose: Provide heat exchange for geothermal heating and cooling systems

How they work: Geothermal heat pump systems use the stable temperature of groundwater or subsurface rock (55-60°F year-round in Southern California) to heat buildings in winter and cool them in summer. Water is circulated through underground loops or pumped from wells, exchanging heat with the ground.

Specifications: Geothermal wells are typically shallower than water supply wells (100-400 feet) and may be smaller diameter. Systems may use "open loop" (pumping groundwater through heat exchanger and returning it to ground via injection well) or "closed loop" (circulating heat exchange fluid through sealed pipes in boreholes).

Permit Authority: San Diego County Department of Environmental Health (DEH), Land and Water Quality Division

When required: All well construction, including new wells, replacement wells, well deepening, well destruction, and monitoring well installation

Application requirements:

• Property information: Assessor's parcel number, property address, legal description
• Well location: Site plan showing proposed well location, property boundaries, existing structures, septic system, water lines, and any other wells on property
• Setback compliance: Documentation that proposed well meets minimum setbacks (typically 50 feet from property lines, 100+ feet from septic systems, 50 feet from buildings, 10 feet from water lines)
• Geological information: General geological description (in some areas, professional geological reports are required)
• Proposed well specifications: Estimated depth, diameter, intended use (domestic, irrigation, livestock, commercial)
• Driller information: Contractor license number (C-57), business information, insurance verification
• Environmental review: CEQA (California Environmental Quality Act) compliance—some areas require environmental review, biological surveys, or archaeological clearances

Permit fees (2026):

• Domestic well: $1,500-$2,000
• Agricultural well: $1,800-$2,500
• Commercial well: $2,000-$3,000+
• Monitoring well: $800-$1,500
• Well destruction: $500-$800
• Environmental review (if required): $2,000-$5,000+ additional

Processing timeline:

• Standard permit (no environmental review): 4-8 weeks
• Permit requiring environmental review: 8-16 weeks
• Permit requiring geological studies: 8-20 weeks (depending on study requirements)
• Expedited processing: Not typically available for well permits

SCWS handles all permit applications on behalf of our clients. We know exactly what DEH requires and ensure complete, accurate applications that minimize delays.

Well Completion Report includes:

• Exact well location (latitude/longitude, site plan)
• Total depth drilled
• Casing specifications (material, diameter, depth intervals)
• Perforated/screened intervals
• Geological formations encountered during drilling
• Static water level (depth to water when well isn't pumping)
• Estimated yield (GPM)
• Drawdown data (how much water level drops during pumping)
• Sealing and grouting details
• Pump installation details
• Water quality test results

SCWS prepares and files well completion reports on all wells we drill. Property buyers, real estate agents, and lenders often request these reports during property transactions. The reports are publicly searchable at California Department of Water Resources' Online System for Well Completion Reports (OSWCR).