Well Pump Failure: Diagnosis, Repair, and Replacement Costs

Your well pump is the heart of your private water system. When it starts to fail, the symptoms can range from subtle — a slight drop in pressure during morning showers — to sudden and complete: you turn on the tap and nothing comes out. This guide walks through the most common signs of pump failure, how to distinguish a submersible from a jet pump, what you can safely check before calling a technician, and what repairs or full replacements will likely cost you.

Signs Your Well Pump May Be Failing

Pump problems rarely appear without warning. If you know what to listen and watch for, you can often catch a developing issue before it becomes a full outage. Here are the most common symptoms:

• •No water at all. The most obvious sign. If you have zero flow from every faucet, the pump has likely stopped running entirely — either from an electrical failure, a tripped breaker, or a burned-out motor.
• •Short cycling. The pressure gauge swings rapidly, and you hear the pump motor clicking on and off every few seconds. This almost always points to a waterlogged pressure tank (lost air charge) rather than the pump itself — but leaving it uncorrected will burn out your pump motor prematurely.
• •Low or dropping water pressure. Gradual pressure loss over weeks or months often indicates worn impellers inside the pump, partial clogging of the intake screen, or a slow drop in the static water level in your well.
• •Dirty, cloudy, or sandy water. Grit or sediment suddenly appearing in your water can mean the pump's intake is damaged, the screen has eroded, or the pump has been set too deep and is drawing from the bottom of the well column.
• •Motor running but no water moving. You can hear the pump humming but get little or no flow. Common causes include a failed check valve, a dropped pipe connection, or burned-out impellers that spin freely without building pressure.
• •Breaker tripping repeatedly. A pump that keeps tripping its dedicated 240-volt breaker is drawing excessive current. This usually signals a failing motor, a wiring fault, or in submersible systems, a problem with the control box or start capacitor.
• •Spitting air from faucets. Air in the lines between uses, especially in the morning, can mean the check valve is no longer holding pressure or the pump is losing its prime (more common with jet pumps).

Submersible vs. Jet Pumps: Which One Do You Have?

The type of pump in your system determines the failure modes you are likely to see, the tools needed to diagnose it, and the labor cost to repair or replace it. The two most common residential pump types work very differently.

Jet pumps sit above ground — typically in a pump house, basement, or utility room — and use suction to draw water up from the well. Shallow-well jet pumps work to about 25 feet of depth. Deep-well jet pumps (which use a two-pipe ejector system) can reach depths up to roughly 100 feet. If you can see your pump unit sitting near your pressure tank with pipes disappearing into the floor or wall, you have a jet pump. These are easier to inspect and repair without specialized equipment.

Submersible pumps are sealed motor-and-pump assemblies set directly inside the well casing, suspended in the water. They are used in wells deeper than about 100 feet and are the standard for most modern residential wells. Because they sit hundreds of feet underground and are connected to the surface only by a wiring harness and a discharge pipe, pulling one for service requires specialized lifting equipment. If your well casing is capped at ground level and you have no visible pump above ground, you almost certainly have a submersible.

Common Failure Modes

Knowing the most frequent causes of pump failure helps you have a productive conversation with any technician you call.

• •Motor burnout. Well pump motors have a realistic service life of 8 to 15 years, depending on how often they run, water quality, and whether they short-cycled for extended periods. Once the motor windings fail, the unit needs to be replaced.
• •Worn or eroded impellers. The impeller stages inside the pump are what actually move water. Pumping sandy or gritty water erodes impellers over time, gradually reducing output pressure and flow rate.
• •Dropped pipe or fitting. The discharge pipe that connects a submersible pump to the surface can fail at a joint, causing the pump to push water back down into the well instead of up to your house. This requires pulling the pump to repair.
• •Pressure switch failure. The pressure switch tells the pump when to turn on and off. A switch with corroded or pitted contacts will misfire — either failing to start the pump or failing to shut it off. This is a relatively inexpensive fix on its own.
• •Control box failure (3-wire submersibles). Many submersible pumps use a separate above-ground control box that houses the starting capacitor and relay. These components can fail independently of the pump motor itself, and replacing the control box is far cheaper than pulling the pump.
• •Check valve failure. A check valve prevents water from flowing back down into the well when the pump shuts off. When it fails, the system loses pressure between cycles, the pump has to restart against a dead column of water, and motor stress increases significantly.
• •Electrical wiring issues. Underground wiring running from the control panel to a submersible pump can develop insulation breaks or corroded splice connections. These cause intermittent faults, breaker trips, and motor damage if left uncorrected.

DIY Checks Before You Call

Several of the most common pump issues are quick homeowner checks that can save you a service call — or at least let you give the technician accurate information when you do call. Work through these in order before picking up the phone.

• •Reset the breaker. Locate the pump's dedicated 240-volt double-pole breaker in your main panel. If it has tripped to the center position, push it fully off and then back on. If it trips again immediately when the pump tries to start, stop resetting it — you have a wiring or motor fault that needs professional diagnosis, and repeatedly resetting can damage the motor further.
• •Check the pressure tank air precharge. With the pump breaker off and pressure bled from the system (open a faucet until flow stops), remove the valve cap on the top of the pressure tank. Use a tire gauge to check the air pressure. It should read 2 psi below your cut-in pressure — typically 28 psi for a 30/50 switch or 38 psi for a 40/60 switch. A waterlogged tank that reads zero air pressure is the most common cause of short cycling. Add air with a regular tire pump or compressor.
• •Inspect the pressure switch contacts. The pressure switch (the small gray or black box mounted near the pressure tank with wires going in) can be opened with a flathead screwdriver. Inside you will see two sets of metal contacts. If they look pitted, burned black, or coated with white mineral buildup, gently clean them with fine emery cloth or replace the switch — a $20–$40 part. Make sure power is off before touching anything inside.
• •Check the control box (3-wire submersible systems). If you have an above-ground control box, look for a run capacitor and start relay inside. A capacitor that is bulging or has brown burn marks has failed. Replacement capacitors are inexpensive and can be swapped by a careful homeowner who understands electrical safety — but discharge the capacitor before handling it.
• •Check fuses (jet pumps). Some older jet pump installations use cartridge fuses rather than breakers. A blown fuse will cut power to the pump motor entirely. Replace with the correct amperage rating only.

If none of these quick checks restore water or reveal an obvious fix, it is time to call a pump technician. At that point you likely have a failed motor, a dropped pipe, or a wiring fault that requires proper diagnostic equipment.

Repair vs. Replace: Making the Call

The decision to repair or replace a pump comes down to three factors: age, failure mode, and how much repair would cost relative to a new unit. Here is a practical framework:

If your pump is under 8 years old and has a clearly isolated problem — a failed pressure switch, a bad capacitor, or a blown fuse — repair is almost always the right call. These are inexpensive parts and the motor itself likely has years of life left.

If your pump is 8 to 12 years old and the motor has burned out or impellers are worn, replacement becomes worth serious consideration. You are partway through the pump's design life, and spending $800–$1,200 to rebuild an aging unit may not be a good use of money when a new pump carries a manufacturer warranty.

If your pump is 12 years or older, the motor has failed, and pulling a submersible already puts you at $500–$1,000 in labor just to have it in hand, the math almost always favors full replacement. You are already most of the way there in cost, and a new pump starts a fresh warranty clock. The same logic applies if you are seeing multiple symptoms at once — pressure switch failure plus low flow plus short cycling usually means the entire system is degrading, not just one component.

What Repairs and Replacements Cost

Prices below reflect typical ranges for parts and labor combined. Costs vary by region, depth of the well, and contractor rates. Deep rural wells that require long drives or specialized pulling equipment will sit at the higher end.

Pump Lifespan and Prevention

A well-maintained pump in clean water can reach the upper end of its design life — 12 to 15 years for a submersible, 10 to 15 years for a jet pump. A pump running in sandy or mineral-heavy water without protection may fail in 6 to 8 years. A few practices make a meaningful difference:

• •Maintain proper pressure tank precharge. A waterlogged tank forces the pump to cycle dozens of extra times per day. Each start puts mechanical and electrical stress on the motor. Check tank precharge annually and add air as needed.
• •Consider a soft-start kit. Soft starters ramp up voltage gradually rather than hitting the motor with full power instantly. This reduces starting torque and heat, extending motor winding life noticeably in high-cycle applications.
• •Size the pump correctly for your system. An undersized pump that runs continuously at its pressure limit wears out far faster than a properly sized unit. An oversized pump short-cycles excessively. If you are replacing a pump, confirm the new unit matches your well's tested yield in gallons per minute — not just the old pump's horsepower rating.
• •Protect the intake from sediment. If your well produces sandy water, a sand separator or centrifugal separator installed on the discharge line reduces the abrasive load on the impeller stages significantly.
• •Schedule an annual inspection. A technician can measure motor amperage draw, check insulation resistance (a "megger" test), verify pressure switch settings, and catch early signs of winding deterioration — often before any symptoms appear at the faucet.

Questions to Ask Your Pump Technician

Before authorizing any repair or replacement, get clear answers to these questions. A straightforward technician will not hesitate to answer all of them.

• •What brand and model pump are you installing? Ask for the specific make and model so you can look up the manufacturer warranty yourself. Common residential submersible brands include Franklin Electric, Goulds, and Grundfos. Avoid unlabeled or no-name units.
• •What warranty comes with the pump, and what covers labor? Manufacturer warranties on submersible pumps typically run 1 to 5 years on parts. Labor warranties vary by contractor — some offer 90 days, others a full year. Understand exactly what happens if the new pump fails in year one.
• •Is the price all-inclusive, or will there be add-ons? Confirm whether the quoted price includes the pump, motor, drop pipe (if replacing), wire, pitless adapter inspection, and pressure switch and tank check. Some contractors quote the pump pull separately from the new equipment.
• •Did you test the well yield before sizing the new pump? If the old pump was undersized or oversized, just swapping it for the same unit repeats the problem. A technician who checks the well's actual flow rate and sizes accordingly is doing the job correctly.
• •Will you inspect the pressure tank and check valve while the system is open? Since you are already paying for a service call, a good technician will check related components while they are on site. A failing check valve or a waterlogged tank will shorten the life of a new pump just as quickly as it shortened the old one.

If you need help finding a qualified pump technician or well service contractor in your area, search our directory of local well drillers and pump services. Many well drilling companies also handle pump repair and replacement, and working with someone already familiar with your well's construction records can save time and diagnostic cost.