The cost to drill a well in Montana commonly ranges from $8,000 to $30,000 for a completed residential system, with many standard projects near $15,000. Depth, geology, pump and tank choices, access for drilling equipment, and the distance from the well to the house can move a quote substantially.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Completed residential well | $8,000 | $15,000 | $30,000+ | Typical drilling, casing, pump, and basic connection; site work may be extra |
| Drilling rate | $25 per ft | $45 per ft | $70+ per ft | Varies with rock, casing needs, and location |
| Well pump and controls | $1,500 | $3,500 | $7,000 | Depends on depth, capacity, and electrical work |
| Testing and disinfection | $150 | $400 | $900 | Basic sampling costs less than expanded laboratory panels |
What a Montana residential well costs at common depths
A drilled residential water well often costs about $8,000-$18,000 when the water-bearing formation is accessible at moderate depth and the site is easy to reach. A deeper well or one requiring extensive casing, a larger pump, or a long line to the home can total $18,000-$30,000 or more. These figures are planning ranges, not a statewide fixed rate.
Drilling is commonly priced by the foot, with a broad planning range of $25-$70 or more per drilled foot. The final price is not simply the drilling rate multiplied by depth: casing, mobilization, pump installation, pressure equipment, trenching, electrical work, and water testing may be separate charges. Ask each contractor to distinguish drilling footage from completed-well pricing.
For a typical home, budget around $15,000 for a complete, moderate-depth installation, then add a reserve if depth and geology are unknown.
Assumptions: one household well, ordinary site access, standard casing and pump, and no unusually long service line or major electrical upgrade.
How drilling, casing, and pump work appear on a quote
A useful estimate separates the work that creates the borehole from the equipment that delivers water to the house. Quotes may bundle several items, so the homeowner should confirm what is included, which footage is billable, and whether the price changes if the well must go deeper or needs additional casing.
| Quote item | Typical range | Common pricing basis | What changes the charge |
|---|---|---|---|
| Rig mobilization and setup | $500-$2,000 | Per job | Travel distance, access, and minimum service charge |
| Drilling | $25-$70+ per ft | Per drilled foot | Depth, formation, and drilling method |
| Casing and well screen | $15-$45+ per ft | Per installed foot | Diameter, material, depth, and ground conditions |
| Pump, controls, and pressure tank | $1,500-$7,000 | Equipment and installation | Lift height, flow needs, and electrical requirements |
| Trenching and house connection | $1,000-$5,000 | Per job or line length | Distance, terrain, freeze protection, and restoration |
| Water testing and disinfection | $150-$900 | Per sample or panel | Tests selected and follow-up sampling |
Labor may be included in the drilling or equipment price rather than shown separately. Where a contractor itemizes it, a broad planning rate is $75-$150 per hour, but specialized rig and crew charges can be quoted as a daily or job rate.
The biggest quote-comparison safeguard is a written list of included footage, casing, pump equipment, trenching, testing, and cleanup.
How depth, casing diameter, and Montana geology change price
Depth is a major cost driver because additional footage can increase drilling, casing, and pump requirements at once. A 100-foot well and a 300-foot well are not interchangeable estimates: at $25-$70 per foot, the drilling component alone could differ by thousands of dollars, before equipment and completion costs are added.
Local well records and nearby well-owner information may help a driller estimate likely depth, but they do not guarantee the depth or yield at a particular parcel. Hard rock, unstable formations, low-yield zones, or a need to seal off shallow water can require different methods or more casing. Ask the contractor what happens to the rate if the well passes the estimated depth.
Residential systems often use casing in the approximate 5- to 6-inch range, though the required diameter depends on the well design and pump. A larger diameter or heavier casing can raise material and handling costs. Pump sizing also matters: a deeper lift or a home with greater flow demand may require a higher-capacity pump, controls, and pressure tank.
Get a depth allowance and a per-foot change order rate in writing; a low initial bid can become expensive if those terms are unclear.
How to lower the well budget without cutting essential work
Compare at least two or three licensed, locally experienced well contractors using the same scope. Ask for a base price, a per-foot rate beyond the assumed depth, casing specifications, and separate charges for the pump, trenching, electrical connection, and testing. Matching assumptions makes apparent price differences easier to interpret.
Keep the house connection route practical. A long trench across rocky or steep ground may add hundreds or several thousand dollars, depending on distance and restoration. Coordinating the route with other planned utility work can reduce repeat excavation, provided the well contractor confirms separation and code requirements.
Choose equipment to match household demand rather than automatically selecting the largest pump or tank. At the same time, do not economize by skipping required casing, sanitary seals, disinfection, or water testing. Those details protect the well and help avoid costly contamination or equipment problems later.
Control the route, scope, and equipment specifications, but retain the well components required for safe construction and reliable operation.
What western, central, and eastern Montana bids may differ by
Montana pricing varies with contractor availability, travel distance, terrain, and local geology. In remote areas, mobilization or a longer wait for a drilling crew can make a bid roughly 10%-25% higher than a comparable accessible job near an established service base. That is a budgeting allowance, not a guaranteed regional premium.
Mountain and foothill parcels may involve steep access, shallow bedrock, or limited places to position a rig. Those conditions can increase setup time and affect drilling methods. In some basins, deeper target formations or difficult access to service providers can raise the total as well. Flat, accessible sites near a contractor’s normal route may have lower travel and setup costs.
Rather than relying on a citywide average, ask contractors who have drilled near the parcel for likely depth, casing design, and access costs. Nearby well records can provide context, but a neighboring well’s depth and yield are not a promise for the new location.
For a remote or difficult-access property, carry a 10%-25% location allowance until a driller inspects the site.
How many days a Montana well installation takes
Once a rig is on site, drilling a straightforward residential well may take one to three working days. A deeper bore, difficult formation, additional casing, or a low-yield well requiring more work can extend drilling to several days or longer. Weather, road access, and contractor scheduling also affect the calendar timeline.
Pump installation, trenching, electrical connection, disinfection, and sampling can add another one to several days, often scheduled separately. The complete project may span a week or more from drilling through house connection, even when the crew’s active work time is shorter. A well contractor can usually provide a more useful schedule after reviewing access and expected depth.
Ask whether the mobilization fee includes a return visit if the pump installer comes later. If separate trades are involved, clarify who coordinates electrical work and trenching. A missed handoff can delay service and sometimes add a second trip charge.
Separate active drilling time from the full project schedule when comparing availability and any daily or return-trip charges.
What permits, testing, and site extras can add
Montana well construction is subject to state requirements, and local conditions may add steps. Before drilling, confirm applicable notification, contractor licensing, construction standards, and any county or subdivision requirements with the driller and the relevant public office. Permit or administrative fees can range from little or no separate charge to several hundred dollars, depending on the location and work involved.
Water testing is a separate budget item unless it appears in the contract. A basic bacteriological test may cost about $50-$150, while a broader chemical panel can bring testing and sampling to roughly $200-$900. The right panel depends on local concerns and intended use; a laboratory or local health authority can clarify what to test for.
Other possible extras include a well cap or sanitary seal, rock excavation for the service trench, grading, disposal of drilling cuttings, and a generator or electrical service upgrade. Allow roughly $500-$3,000 for modest site or utility complications, but severe access or rock work can exceed that range. Confirm who restores disturbed ground and whether the quote includes disposal.
Request an itemized allowance for testing, permits, trenching, disposal, and electrical work rather than treating the drilling rate as the project total.
What three Montana well quotes can look like
These examples illustrate how depth and scope affect the bill; actual bids depend on location, geology, and contractor pricing. Each assumes a single residential well and standard household equipment, not an irrigation or livestock system.
| Example | Scope and assumptions | Estimated total |
|---|---|---|
| Accessible, shallow well | 120 ft drilled at about $35 per ft; basic casing, pump and tank, short connection, testing | $9,000-$13,000 |
| Typical mid-depth home well | 220 ft drilled at about $45 per ft; standard casing, pump system, moderate trench, testing | $14,000-$21,000 |
| Deep or challenging parcel | 350 ft drilled at about $60 per ft; more casing, higher-lift pump, difficult access and longer line | $25,000-$38,000+ |
The drilling component in those examples is only a portion of the total. For instance, 220 feet at $45 per foot equals $9,900 before casing, pump equipment, trenching, testing, and mobilization. A contractor may use a bundled rate, so the example should not be read as a universal schedule.
Use an example as a scope check, not as a substitute for a parcel-specific estimate or a confirmed local depth.
When a repair quote beats drilling a replacement well
If an existing well has stopped delivering water, the problem may be a failed pump, pressure switch, electrical component, or pressure tank rather than a failed borehole. A diagnostic visit can cost about $100-$300, often credited toward repairs. Pump replacement commonly runs $1,500-$5,000, while a pressure tank or switch repair may fall around $300-$1,500, depending on access and parts.
A replacement well may be justified when the existing bore is contaminated beyond practical treatment, structurally compromised, or persistently too low-yield for the household. New drilling can cost $8,000-$30,000 or more, so a diagnosis and water test are usually useful before committing to a new hole. Treatment equipment is another option for some water-quality issues, but it does not fix a failed or inadequate well.
Ask the technician to identify the failure and provide a repair-versus-replacement estimate. If the well is deep or the pump is difficult to retrieve, service labor and equipment can raise the repair price, but that may still be less than drilling and completing a new well.
Confirm whether the problem is the pump, water quality, or the well itself before budgeting for replacement drilling.