How a Submersible Well Water Pump Works
A submersible well water pump is installed deep inside the well, fully submerged below the water line. Instead of pulling water up through suction like a jet pump, it pushes water upward to your pressure tank.
Here is the simple version of what happens:
- The pump motor is sealed and sits underwater.
- When the system calls for water, the motor spins a series of impellers.
- These impellers move water upward through the drop pipe.
- Water travels to the pressure tank, where it is stored and distributed through the home.
Because the pump is already surrounded by water, it never needs to be primed. It also stays naturally cooled by the well water, which helps extend the motor life.
Most residential submersible pumps use a multi-stage design. Each impeller adds pressure, allowing the pump to move water efficiently from deep wells without losing performance.
This design is why submersible pumps:
- Handle deep wells better
- Maintain more consistent pressure
- Use less energy compared to suction-based systems
When a Submersible Pump Is the Right Choice
We don’t always recommend a submersible pump, but in the right conditions, they outperform jet and centrifugal pumps.
Deep Wells
If your well is deeper than 25 feet, a submersible pump is usually the better choice. Jet pumps struggle with suction limits, while submersible pumps push water upward efficiently from the bottom of the well.
Noise Concerns
Because the pump sits underwater, submersible systems are significantly quieter than above-ground jet pumps. This is a real benefit when equipment is near living spaces.
Energy Efficiency Concerns
Submersible pumps use less energy to move water upward than suction-based systems. Over time, this translates to lower operating costs.
Sediment-Prone Wells
When properly selected and installed, submersible pumps handle Arizona sediment better than jet pumps, which can lose prime or clog more easily.
When a Jet or Centrifugal Pump Might Be Better
Submersible pumps are not always the best option.
- Shallow wells may be better served by jet pumps due to easier access and a lower upfront cost
- Service accessibility favors jet pumps, since submersible pumps require pulling the pump from the well.
- Low-demand properties such as cabins or seasonal homes may not need the performance level of a submersible system.
The right pump depends on well depth, water quality, demand, and long-term maintenance expectations.
Other Concerns When Choosing a Well Water Pump
The type of pump matters, but it’s only one piece of the decision. Choosing the right submersible well water pump means looking at the entire well system and how your household actually uses water.
Flow Rate and Household Demand
Flow rate, measured in gallons per minute (GPM), determines how much water your pump can deliver at one time. Most homes operate comfortably in the 8 to 15 GPM range, but that number changes based on:
- Number of bathrooms
- Appliances running at the same time
- Irrigation or outdoor water use
- Pressure tank size
A pump that delivers more water than the well can recharge will cause drawdown issues and premature wear. Matching pump output to well recovery rate is critical.
Sediment and Water Quality
Sand, silt, and mineral content directly affect pump longevity. Some pumps are designed to tolerate light sediment better than others. Ignoring water quality leads to clogged impellers, worn seals, and early failure. In Arizona, sediment is not a minor issue. It should be part of every pump selection conversation.
Pressure Tank Compatibility
The pump and pressure tank must work together. A mismatch leads to rapid cycling, inconsistent pressure, and unnecessary stress on the motor. Pump selection should always account for existing tank size or include upgrading it if needed.
Access and Long-Term Maintenance
Submersible pumps are durable, but they are not quick-access equipment. Pulling a pump from a deep well takes time and proper tools. That makes proper sizing and installation even more important, since service calls are more involved than with surface pumps.
When Is It Time to Replace a Well Pump?
Most residential well pumps last 8 to 15 years, but age alone is not the deciding factor. Pumps usually get replaced because performance drops, household demand changes, or the pump starts failing under Arizona conditions.
Common replacement triggers include:
- Low or fluctuating water pressure
- Frequent cycling on and off
- Air sputtering from faucets
- Rising electric bills tied to pump usage
- Sediment or sand damage wearing down components
- A pump that can no longer keep up with household demand
In Arizona, heat, mineral-heavy water, and sediment accelerate wear. A pump that worked fine ten years ago may no longer be efficient or reliable today. Well pump replacement is often the smarter move once repairs become frequent or performance falls below daily needs.
Professional Submersible Well Pump Installation in Arizona
If your well pump is struggling, failing, or no longer keeping up with your household, it may be time for replacement. Choosing the right submersible well water pump requires more than picking horsepower off a chart. Well depth, recharge rate, sediment levels, and household demand all matter.
Arizona Pump Services provides professional well pump installation and replacement for homeowners across the Phoenix West Valley. Their team evaluates your well system, sizes the pump correctly, and installs it to support long-term performance in Arizona conditions.
If you are experiencing low pressure, inconsistent water flow, or frequent pump issues, contact Arizona Pump Services to schedule a well pump inspection and discuss the right submersible pump solution for your property.
