Commercial Water Well Cost

What "commercial well" actually covers

"Commercial water well" is a broad category that includes anything from a small bed-and-breakfast supplying a few guest rooms to a public-water-system regulated under the federal Safe Drinking Water Act. The regulatory and engineering treatment differs across this range, and the cost difference reflects that.

On the small end: a motel with 15 rooms, a roadside restaurant, a single-tenant office building, a winery tasting room with no on-site residence. Demand 200 to 1,500 gallons per day. Drinking-water service for staff and customers, plus operational use (kitchen, restroom, irrigation). Below the EPA SDWA public-water-system threshold (15 connections or 25 people for 60 days) but still subject to state drinking-water regulations as a transient non-community water system. The drilling and pump install look much like a heavy-residential well; the difference is mostly in casing diameter, redundancy and treatment.

On the middle: an RV park with 30 to 80 sites, a 9-hole golf course with clubhouse, a small wedding venue, a moderate-sized church camp. Demand 5,000 to 25,000 gallons per day. Often above the 25-person-for-60-days SDWA threshold and therefore regulated as a non-transient non-community water system, which adds quarterly testing requirements and source-water protection planning. Drilling and infrastructure are sized for the larger demand: 8 inch casing, 15 to 25 HP pump, three-phase electrical, treatment train.

On the regulated end: a hotel with 100+ rooms, a residential subdivision with shared well, an 18-hole golf course with clubhouse and homes, a Christian conference centre, a small unincorporated community supplied by a single well. Above both SDWA thresholds and regulated as a community public water system: monthly coliform sampling, full chemical testing, certified operator on staff or contracted, public notification requirements when violations occur. Infrastructure includes redundant pumps, chlorination, often pressure-zone management, and dedicated metering and monitoring. The well itself may be one of several in the system rather than the only source.

Cost breakdown for a representative mid-sized commercial well

Take a 500-foot 8-inch commercial well serving a 50-site RV park in central New Mexico, drilled through alluvial sediments to a confined aquifer at 400 to 500 feet. The park has peak summer demand of 12,000 gallons per day. The well is regulated as a non-transient non-community public water system (over 25 people for over 60 days during the season).

Line items at 2026 rates. Mobilisation (commercial-spec rig with PWS-experienced crew) $2,500. Drilling 500 feet at 12 inches through alluvium and sediment at $75 per foot ($37,500). Eight-inch steel casing 500 feet at $26 per foot installed ($13,000). Stainless steel well screen 60 feet at $80 per foot ($4,800). Gravel pack and grouting $3,000. Sanitary well cap and seal $700. Development 16 hours $2,200. Submersible pump 15 HP 460V three-phase $7,500. Drop pipe (stainless, 480 ft) $5,200. Submersible cable 480 ft (6 AWG three-phase) $2,800. Control panel with variable-frequency drive and lockable enclosure $5,500. Three-phase electrical service to wellhead (transformer plus 400 ft trench) $14,000. Chlorination system with proportional metering and contact tank $5,500. Hydropneumatic pressure tank 220 gallon $3,200. Backflow preventer $1,200. Concrete pump pad and lockable wellhouse enclosure $4,500. Distribution piping to RV park trunk (200 ft 4 inch HDPE) $4,000. State PWS permit, source-water assessment, engineering review $7,500. PE-stamped plans $5,000. Subtotal: $129,600. With 10 percent contingency, $142,560. That is a typical upper-end bid for a small PWS install in 2026.

Drilling and casing together ($55,300) are 43 percent of subtotal. Pump-electrical-controls package ($35,000) is 27 percent. Treatment and pressure-management ($10,000) is 8 percent. Wellhouse and distribution ($8,500) is 7 percent. Permitting and engineering ($12,500) is 10 percent. The remaining 5 percent is mobilisation, development and contingency. Notice that engineering and permitting alone is more than the cost of a complete residential well; this is what distinguishes commercial-spec work.

EPA Safe Drinking Water Act compliance thresholds

The federal Safe Drinking Water Act, administered through state drinking-water programs delegated by EPA, defines three categories of public water system:

Community Water System (CWS). Serves at least 15 service connections used by year-round residents, or regularly serves at least 25 year-round residents. Subdivisions, mobile-home parks, residential developments, small unincorporated communities. Full SDWA compliance: monthly coliform sampling, quarterly to annual chemical testing, lead-and-copper rule compliance, source-water protection plan, certified operator, public notification of violations, annual consumer confidence report.

Non-Transient Non-Community Water System (NTNCWS). Regularly serves at least 25 of the same people over six months of the year. Schools, factories, office buildings with their own well. Reduced sampling frequency compared to CWS; lead-and-copper rule applies; coliform sampling monthly or quarterly depending on population.

Transient Non-Community Water System (TNCWS). Regularly serves at least 25 people for at least 60 days per year, but not the same people. Highway rest areas, campgrounds, restaurants, RV parks with seasonal usage. Coliform sampling required; nitrate testing annually; lighter chemical-testing schedule.

Below all three thresholds (a small business serving fewer than 25 people or fewer than 15 connections), the well is not federally regulated as a PWS, but state drinking-water rules generally still apply. The compliance cost differs by category and state. A CWS may spend $15,000 to $50,000 per year on ongoing compliance (sampling fees, operator salary, lab costs, paperwork). A TNCWS may spend $1,500 to $5,000. The cost differential drives many small commercial operations to stay below the PWS thresholds where feasible.

Chlorination and treatment

Almost all commercial wells include chlorination, either by regulatory requirement (PWS) or by best practice (lower-risk facilities that still want a treatment barrier). The standard install is a chemical-metering pump that injects sodium hypochlorite (or, on larger systems, calcium hypochlorite tablets) into the distribution line at the wellhead, followed by a contact tank or contact pipeline of sufficient volume to provide the regulatory minimum chlorine-contact-time before water reaches the first user.

Equipment cost. Stenner-style or LMI-style metering pump $400 to $1,200. Day tank or batch tank (chlorine solution storage) $200 to $800. Contact tank (small commercial 100 to 500 gallon) $800 to $3,500 OR contact pipeline (300 to 1,000 ft of larger-diameter pipe to provide CT) $2,000 to $5,000. Free-chlorine sampling port $100. Total chlorination install $2,500 to $8,000.

Operating cost. Sodium hypochlorite at $1.50 to $3 per gallon, used at 1 to 5 gallons per million gallons treated. A 5,000 gallon-per-day facility uses about 5 to 25 gallons per year in chemical ($10 to $75 annual cost). Daily monitoring (one free-chlorine residual test) at 5 minutes per day plus lab samples sent in quarterly. Operator time and lab fees $1,500 to $5,000 per year on a small system.

Beyond chlorination. Some commercial wells need additional treatment for iron, manganese, hardness, nitrate, arsenic or other parameters depending on the local groundwater. Iron-and-manganese removal (oxidation plus filtration) on a 10 gpm commercial well runs $5,000 to $15,000 installed. Reverse-osmosis for high-TDS or nitrate-elevated water on a smaller commercial well runs $8,000 to $25,000. The treatment train is sized by the water test, not by intuition; commission a comprehensive water analysis at the well-completion stage to identify what is needed.

Redundancy and reliability

Residential wells have a single point of failure: the pump. When it fails, the well is dry until a service call gets it replaced. For a household, that is an inconvenience. For a commercial operation (a 50-room hotel, a restaurant in mid-service, an RV park during a holiday weekend), it is a business-shutdown event.

Commercial well systems typically include redundancy at the pump level and the controls level. A duplex pump configuration installs two pumps in the same well casing, plumbed in parallel, with automatic switchover when the lead pump fails or pumps off (loses suction). The cost premium for a duplex install over a single-pump install is $5,000 to $15,000 depending on pump size: a second pump, a second drop pipe (or shared pitless adapter with check valves), a more sophisticated control panel that detects failure and switches.

Beyond pump redundancy, some commercial systems include a second well as a complete backup, either drilled at the same time as the primary or held in reserve as a contracted future install. Two-well configurations are standard for community water systems serving over 100 connections; on smaller commercial operations, the second well is often skipped in favour of a large storage tank that buffers 1 to 3 days of demand at the cost of pump failure. The trade-off depends on the business's tolerance for service interruption.

Cross-references and related pages

For agricultural irrigation context (larger pumps, similar engineering), agricultural irrigation well cost. For livestock-watering context (smaller, simpler scope), livestock water well cost. For the underlying per-foot drilling rate, well drilling cost per foot 2026. For the depth-bracket cost analyses, 300 ft, 500 ft. For state-specific permit and PWS regulation, cost by state. For commercial-grade pressure-tank sizing, well pressure tank cost.