Homes using private wells depend on pumps to bring water from underground aquifers into the house. Unlike municipal water systems where maintenance is someone else's responsibility, well owners must understand and maintain their own water supply system. The well pump is the heart of this system, and understanding how it works, recognizing problems, and knowing when professional service is needed helps ensure reliable water supply and protects your investment in your water system.
Types of Well Pumps
Residential well pumps fall into two main categories based on their location and the depth of the well. Understanding which type you have helps with troubleshooting and maintenance.
Submersible pumps are located underwater in the well itself, typically at the bottom or several hundred feet down. They push water up through the drop pipe to the surface. Because they're submerged, they're quiet and less prone to freezing, but they're more difficult to access for repair since pulling the pump requires specialized equipment. Submersible pumps are the most common type in modern installations, particularly for deep wells.
Jet pumps are located above ground, usually in a basement, pump house, or well pit. They work by creating suction to draw water up from the well through a pipe called a suction line. Jet pumps are easier to access for maintenance but are noisier, can freeze in cold weather if not protected, and are generally limited to shallower wells (typically less than 25 feet deep for shallow-well jet pumps, though deep-well jet pumps can handle greater depths).
How Your Well System Works
A complete well system includes more than just the pump. The well itself is a hole dug or drilled into the ground that intersects with a water-bearing aquifer. A casing (usually steel or PVC) lines the well to prevent contamination from surface water and to stabilize the hole. Water enters the casing through slots or screens at the bottom.
The pump draws water from the well and delivers it under pressure to your home. A pressure tank stores water so the pump doesn't need to run constantly—water fills the tank until it reaches a set pressure, then the pump turns off. When you open a faucet, water flows from the tank until the pressure drops to a lower set point, at which time the pump turns back on to restore pressure.
Modern systems use bladder-type pressure tanks with an air chamber separated from the water by a rubber bladder. Older systems may have conventional tanks that require annual air charging to maintain the air cushion above the water. The pressure switch controls the pump, turning it on at the lower pressure setting (typically 30-40 psi) and off at the upper setting (typically 50-60 psi).
Common Well Pump Problems
Recognizing well pump problems early prevents more serious failures. The symptoms of pump problems are usually obvious—a reduction in water pressure, air sputtering from faucets, or a pump that runs continuously without shutting off.
If your pump runs constantly or cycles on and off rapidly, the pressure tank likely has a problem. A waterlogged tank (where the air cushion has been lost and the tank is full of water) causes the pump to cycle rapidly because there's no air cushion to absorb pressure fluctuations. Check the tank's air charge using a tire gauge on the Schraeder valve on top of the tank (with the water system pressurized). If air comes out as water, or if the pressure is below the recommended level (usually 2 psi below the cut-in pressure), the tank needs attention.
Air in the water lines manifests as sputtering or spurting when you open a faucet. This can come from a leak in the suction line on jet pump systems, from a ruptured bladder in a pressure tank, or from a faulty pump that isn't priming properly. Air in the lines should be investigated promptly because it can damage plumbing fixtures and indicates a system problem.
Pump Cycling Problems
Rapid cycling (pump turning on and off frequently) is usually a pressure tank issue, as mentioned above. If the tank is waterlogged, you can sometimes restore it by adding air through the Schraeder valve. However, bladder tanks that have lost their charge are usually not repairable—they need to be replaced. The cost of a new pressure tank is modest compared to the damage that can result from a failing tank causing your pump to cycle excessively.
If the pump doesn't cycle at all (runs continuously), either your water usage exceeds the pump's capacity, there's a significant leak somewhere in the system, or the pump is failing and can't maintain pressure. Check for running toilets, dripping faucets, or irrigation systems that might be consuming more water than the pump can replace. If no obvious leak exists, the pump itself may need service or replacement.
⚠️ Important
Never run a well pump dry. Submersible pumps are cooled by the water around them—running without water can destroy the pump motor quickly. If your pump is running but no water is coming up, shut it off immediately and investigate. The well itself may have gone dry, there's a break in the drop pipe, or the pump has failed.
When to Call a Professional
Well pump work involves specialized knowledge, tools, and physical labor that most homeowners shouldn't attempt. Installing or replacing a pump requires calculating pump size based on well depth, flow rate requirements, and pressure needs; lifting heavy equipment into and out of the well; making proper electrical connections; and adjusting pressure switches and tank settings. This work is firmly in professional territory.
Electrical issues with well pumps are especially dangerous because the pump motor requires high amperage to start, and the wiring carries potentially lethal voltage. If you suspect electrical problems—pump not turning on, circuit breaker tripping, or burning odors from the control box—shut off the power and call an electrician or well pump professional immediately.
For troubleshooting and minor maintenance that doesn't involve the pump itself, some tasks are manageable. Pressure switch adjustment (within reason), checking and adding air to conventional pressure tanks, and checking wiring connections (with power off) are within the capability of a competent DIYer. But when in doubt, call a professional—it's better to pay for a service call than to make a mistake that damages the pump or causes injury.
Well Maintenance and Protection
The well itself requires maintenance and protection. Keep the area around the wellhead clean and clear of vegetation, and inspect it regularly for damage. The well cap or seal should be secure and in good condition to prevent contamination from insects, animals, and surface water. Don't allow landscaping activities that could damage the well casing or allow chemicals to seep into the ground near the well.
Have your water tested annually for bacteria and periodically for other contaminants. Well water quality can change over time due to changes in the aquifer, nearby land use, or the well itself. If testing reveals contamination, a water treatment system or well repairs may be necessary. Your local health department can provide guidance on testing requirements and acceptable standards.
Conclusion
Well pump systems are durable and can provide decades of reliable service with proper maintenance. Understanding how your system works helps you recognize problems early and communicate effectively with service professionals. Regular water testing, protecting the wellhead from contamination and damage, and addressing pressure tank issues promptly all contribute to a reliable water supply. When major pump work is needed, hire qualified professionals with experience in well systems—the cost of proper installation is modest compared to the expense and inconvenience of repeated failures.