What Affects Well Drilling Cost

Depth is the primary driver of well drilling cost. Contractors charge per foot drilled, and you pay for every foot whether they find water at 80 feet or 350 feet. National averages range from $25 to $65 per foot depending on ground conditions and region. An average residential well of 150 to 300 feet costs $3,750 to $19,500 in drilling alone. There is no way to know the required depth before drilling begins. Depth to the water table varies enormously by geography. In parts of the Mid-Atlantic, reliable water is found at 150 to 250 feet. In New England, rocky terrain may require 300 to 500 feet. In the High Plains, shallow aquifers may yield water at 50 to 100 feet. A hydrogeological survey ($500 to $1,500) provides a probabilistic estimate of depth based on nearby wells and regional aquifer data, which helps budget before you commit. Most drillers will also pull the well log from the state database to see what depth neighboring wells reached water.

The geology underneath your property determines how difficult and time-consuming drilling is. Sand and gravel are the easiest and cheapest to drill, allowing fast progress at $25 to $35 per foot. Clay is slightly harder at $30 to $45 per foot and common in the Midwest and Southeast. Soft rock such as limestone or sandstone runs $35 to $55 per foot and is typical in the mid-Atlantic states and parts of the South. Hard rock formations including granite, basalt, and quartzite are the most expensive at $45 to $65 per foot. These are common in New England, the Rocky Mountains, the Appalachians, and parts of the Pacific Northwest. Hard rock drilling wears out drill bits faster, requires more powerful equipment, and simply takes more time per foot. In the same zip code, a property sitting over granite can cost twice as much to drill as a property over sand and gravel, with no way to know the difference until the drill hits it.

Well drilling requires a large truck-mounted drill rig that needs clear access to the drilling site. If the site has limited road access, the contractor may need to bring smaller equipment or clear a path, adding cost. Remote rural properties with long drives from the driller's base add fuel and time charges. Hillside or sloped properties require leveling equipment to stabilize the rig. Properties with mature trees or other obstructions close to the planned well location may require landscaping work to clear the site. In dense suburban areas where the well must be placed in a specific small area due to setback requirements from septic systems, property lines, and structures, the limited options may reduce drilling efficiency. Site access issues are usually quoted as a lump sum add-on after the driller visits the property in person.

Most states require a well drilling permit before work begins. Permit fees range from $100 to $500 depending on the jurisdiction. Some counties have additional local permits. The permitting process also establishes required setback distances from septic systems (usually 50 to 100 feet), property lines (usually 10 feet), and potential contamination sources. After drilling, most jurisdictions require water quality testing before the well is approved for domestic use. A basic water test covering bacteria, nitrates, and pH runs $100 to $200. A comprehensive test including heavy metals, radon, VOCs, and other contaminants runs $300 to $500. Some states require specific certified labs for well water testing. These are not optional costs; they are legally required in most areas before the well can be connected to the home's plumbing.

Well casing is the pipe that lines the borehole to prevent wall collapse and contamination. Standard 6-inch PVC casing costs $5 to $8 per foot. Steel casing runs $8 to $15 per foot. Steel is required in some jurisdictions, particularly in areas with unstable soils or where PVC is prohibited. Casing is needed for the full depth of the well, adding $750 to $4,500 to a 150 to 300-foot well on top of the drilling cost. Some drillers include casing in their per-foot rate; others bill it separately. Read quotes carefully to understand whether casing is included. Larger 8-inch diameter casings are used for high-yield irrigation wells but are not standard for residential domestic wells.

The pump and water system components are separate from the drilling cost but are equally important to budget. A shallow well jet pump (for wells under 25 feet) costs $300 to $600 installed. A submersible pump for deep wells (25 to 400 feet) costs $500 to $2,000 for the pump itself plus $300 to $600 in labor to set it at the correct depth inside the well. The pump is matched to the well yield (gallons per minute) and the depth. A 1 HP submersible pump handles most residential deep wells. In addition to the pump, budget for a pressure tank ($300 to $1,500), a well head and pitless adapter ($100 to $300), and plumbing from the wellhead to the house ($500 to $2,000 depending on distance). The complete installed cost of all water system components on top of drilling typically runs $2,000 to $5,000.