Choosing a well pump isn't simply a matter of picking the biggest unit available. The right pump should match your well's characteristics, your household's water usage, and the performance you expect from your water system. Making the right choice from the start can help prevent pressure issues, reduce energy costs, and extend the life of your equipment.

1. Know Your Well Depth

One of the first factors to consider is the depth of your well. Different pump types are designed to operate efficiently at different water levels.

Shallow Well Pumps

Shallow well pumps are typically used when the water level sits less than 25 feet below ground. These pumps are installed above ground and use suction to draw water from the well.

Deep Well Jet Pumps

For wells with water levels between approximately 25 and 110 feet, a deep well jet pump may be a suitable option. These systems use an injector located inside the well, allowing them to lift water from greater depths while keeping the pump itself above ground.

Submersible Pumps

Submersible pumps are the most common choice for deep wells. Installed below the water level inside the well casing, they push water to the surface rather than pulling it. This design makes them highly efficient, reliable, and capable of operating at depths ranging from a few dozen feet to several hundred feet.

2. Estimate Your Water Demand

A well pump should be able to keep up with your household's peak water usage. Pump output is measured in gallons per minute (GPM), and understanding your demand helps narrow down the right size.

A practical way to estimate water usage is to count the fixtures and appliances throughout the home, including:

• Showers
• Toilets
• Bathroom and kitchen faucets
• Washing machines
• Dishwashers
• Outdoor hose connections

As a general guideline, each fixture represents roughly one gallon per minute of demand. A home with ten fixtures, for example, will often require a pump capable of delivering around 10 GPM.

3. Don't Overlook Well Recovery Rate

Many homeowners assume a larger pump automatically provides better performance. In reality, the pump should be matched to the well's ability to replenish water.

The recovery rate, or well yield, indicates how much water the well can produce and is typically measured in GPM. This information can often be found in the original well report.

If a well produces 5 GPM but a pump is designed to deliver significantly more, the water level may drop faster than the well can recover. Over time, this can lead to increased wear on the pump and reduced system performance.

For lower-yield wells, a properly sized pump combined with adequate storage or pressure tank capacity can provide a more dependable water supply while protecting the well itself.

4. Understand Total Dynamic Head (TDH)

A pump's job extends beyond lifting water from the well. It must also move that water through the plumbing system while maintaining the pressure needed throughout the home.

This overall workload is known as Total Dynamic Head (TDH), which includes several factors:

Static Lift

The vertical distance from the water level in the well to the highest plumbing fixture in the home.

Friction Loss

Resistance created as water travels through pipes, fittings, valves, and other components.

System Pressure

The operating pressure required by the household water system, commonly set at 30/50 PSI or 40/60 PSI.

Accurately calculating TDH helps ensure the selected pump can deliver consistent pressure and flow under everyday conditions.

5. Choose the Right System Setup

Modern well systems offer several configurations, each with its own advantages.

2-Wire Pumps

These pumps contain their starting components within the motor itself, resulting in a simpler installation and fewer external parts.

3-Wire Pumps

A 3-wire system uses a separate control box mounted above ground. While installation is slightly more involved, troubleshooting and repairs are often easier because many electrical components remain accessible.

Constant Pressure Systems

Homeowners looking for more consistent water pressure may benefit from a constant pressure system or variable frequency drive (VFD). These systems automatically adjust pump speed based on water demand, helping to:

• Maintain steady pressure throughout the home
• Minimize pressure fluctuations when multiple fixtures are running
• Improve overall comfort and system efficiency

Final Thoughts

A well pump is one of the most important components of any private water system. Choosing the right model requires balancing well depth, household demand, well yield, pressure requirements, and overall system design.

Taking the time to evaluate these factors can help you avoid costly repairs, improve efficiency, and enjoy a dependable water supply for years to come.

Need help selecting the right well pump? Contact the experts at R.C. Worst & Company. Our team can help you find the right solution for your well and water system needs.