Depth-Based Pricing
Well Drilling Cost by Depth
Well depth is the single biggest factor in drilling cost. Deeper wells cost more per foot and need more casing, grouting, and a more powerful pump. Here is what to expect at every depth. Last verified April 2026.
Soft soil (sand, clay, gravel)
$15–$30
per foot
Medium (sandstone, limestone)
$30–$55
per foot
Hard rock (granite, basalt)
$55–$100
per foot
Complete Cost Table by Well Depth
| Depth | Low End | Typical | High End | Notes |
|---|---|---|---|---|
| 25 ft | $1,500 | $2,250 | $3,000 | Shallow — hand-dug or driven point |
| 50 ft | $2,500 | $3,750 | $5,000 | Driven or shallow drilled |
| 100 ft | $5,000 | $7,000 | $9,000 | Standard residential depth |
| 150 ft | $7,500 | $10,500 | $13,500 | Common in many US regions |
| 200 ft | $10,000 | $14,000 | $18,000 | Deeper sedimentary areas |
| 250 ft | $12,500 | $17,500 | $22,500 | Rocky terrain typical |
| 300 ft | $15,000 | $21,000 | $27,000 | Deep bedrock regions |
| 400 ft | $20,000 | $28,000 | $36,000 | Difficult geology |
| 500 ft+ | $25,000 | $37,500 | $50,000 | Arid/deep water table |
Visual Cost Comparison
How Geology Affects Drilling Cost
The type of soil and rock your well driller encounters is the second-biggest cost driver after depth. Soft, unconsolidated materials like sand and gravel can be drilled quickly, keeping costs at $15–$30 per foot. Medium-density formations like sandstone and limestone require more time and wear on drill bits, pushing costs to $30–$55 per foot. Hard crystalline rock such as granite and basalt is the most expensive at $55–$100 per foot because it requires specialized rotary bits, more fuel, and more time.
Your driller cannot know the exact geology until they start drilling. Many drillers charge a base rate for the first 100 feet and a per-foot rate after that. Always get a written estimate that includes a "what if we hit rock" clause so you are not surprised by cost overruns.
Tips to Control Depth-Related Costs
- Get multiple quotes: Prices vary 30–50% between drillers for the same well. Get at least 3 written bids.
- Ask about local depth data: Your county or state water resources department often has well logs showing typical depths in your area.
- Consider hydrofracturing: If an initial bore produces low yield, hydrofracturing ($2,000–$5,000) can increase flow without drilling deeper.
- Choose your well location wisely: Low points on your property and areas near surface water tend to have shallower water tables.
- Drill in dry season: Some drillers offer off-season discounts, and dry-season drilling better reflects your year-round water level.
Depth & Cost FAQ
How much does it cost to drill a 200 foot well?
A 200-foot residential well typically costs $10,000 to $18,000 depending on geology. In soft soil, expect $10,000–$12,000. In hard rock like granite, costs can reach $18,000–$20,000. This includes drilling only — add $2,000–$5,000 for pump, casing, and permits.
What is the cost per foot to drill a well?
Well drilling costs $15–$100 per foot depending on geology. Soft soil (sand, clay, gravel) costs $15–$30/ft. Medium rock like sandstone and limestone costs $30–$55/ft. Hard rock such as granite and basalt costs $55–$100/ft.
How deep should a residential well be?
Most residential wells are 100–400 feet deep. The required depth depends on your local water table, which varies by region. Coastal areas may only need 50–100 ft, while arid western states often require 300–500+ ft. Your local well driller or county health department can advise on typical depths.