Quick answer:
A well pump rarely fails without warning. The eight most common signs of a failing pump are: declining water pressure over time, the pump running longer than normal to reach pressure, short cycling, air spitting from faucets, discolored or sediment-laden water, a higher electricity bill with no change in usage, unusual sounds from the pressure switch or control box, and complete loss of water. Age matters more than most homeowners realize — a pump showing any of these signs at 12 or more years old is statistically near end of life and warrants professional evaluation regardless of severity. A pump showing the same signs at 3 years old is a very different situation.
The Age Factor: Start Here Before Anything Else
Before working through the eight warning signs, check your pump's age. This single piece of information changes how you interpret every symptom below.
A quality submersible well pump from a reputable manufacturer (Grundfos, Franklin, Goulds) has a typical lifespan of 10 to 15 years under normal residential use. Some pumps on clean water with correct pressure tank sizing run 20 years or more. Others in areas with corrosive, acidic, or sediment-heavy water fail in 7 to 8 years.
Under 7 Years
A pump under 7 years old showing warning signs almost certainly has a fixable cause — a failed pressure tank, a pressure switch issue, a plumbing leak, or a water quality problem affecting the pump. The pump itself is probably not the culprit and replacing it prematurely would be expensive and unnecessary.
7 to 12 Years
A pump between 7 and 12 years old showing warning signs is in its mid-life range. Some causes are still fixable. Others may indicate wear that will progress to failure. Professional evaluation is warranted.
Over 12 Years
A pump over 12 years old showing any of the signs below should be evaluated by a professional with replacement budgeted as a likely outcome. At 15 years, any significant symptom is a strong indicator that replacement is coming. Planning proactively costs significantly less than an emergency replacement.
How to find your pump's age: Check the well completion report filed with your county health department when the well was drilled. The report lists the pump model and installation date. If the pump has been replaced since the well was drilled, check any paperwork from that service. If no records exist, a licensed well contractor can often estimate age from the pump model number.
Declining Water Pressure Over Time
What you observe:
Water pressure that was adequate a year or two ago now seems lower during showers, when running the dishwasher, or when using multiple fixtures simultaneously. The decline is gradual rather than sudden.
What it means mechanically:
Gradual pressure decline in a submersible pump most commonly indicates worn impellers — the rotating components inside the pump that move water upward through the drop pipe. Impellers made of plastic or stainless steel wear over time, particularly in water with sand or sediment. Gradual pressure decline can also indicate a partially clogged well screen or a slowly declining well yield.
Urgency: Moderate. Gradual pressure decline is not an emergency but warrants professional evaluation within the next few weeks, particularly if the pump is over 10 years old.
What to do:
Schedule a professional well inspection. Do not attempt to pull and inspect the pump yourself — it requires specialized equipment and a trained contractor.
Pump Running Longer Than Normal to Reach Pressure
What you observe:
You notice the pump running for noticeably longer periods after water use than it did previously. Where it used to cycle on for 2 to 3 minutes and reach pressure, it now runs for 5 to 10 minutes or longer before the pressure switch shuts it off.
What it means mechanically:
Extended run time to reach cut-out pressure indicates the pump is moving less water per unit of time than it should. This can also indicate a check valve problem — if the check valve is failing and allowing water to slowly leak back down the drop pipe, the pump has to re-pressurize the drop pipe on every cycle, adding significant run time.
Urgency: Moderate to high. Extended run time increases electricity consumption and accelerates motor wear. Schedule professional evaluation promptly.
What to do:
Monitor and note the run time on several consecutive cycles to confirm the pattern. Check the pressure gauge and confirm the pump is actually reaching the cut-out pressure — if it is not reaching cut-out, that is a more urgent issue. Call a professional for a diagnostic visit.
Short Cycling
What you observe:
The pump turns on and off rapidly — every few seconds rather than running for minutes at a time. You hear repeated clicking from the pressure switch with the pump running in short bursts.
What it means mechanically:
Short cycling is most commonly caused by a waterlogged pressure tank rather than a failing pump. When the pressure tank's diaphragm fails and the air charge is lost, the tank can no longer buffer the pressure change between pump cycles. Short cycling caused by a waterlogged tank does not necessarily mean the pump is failing — but it will cause the pump to fail prematurely if not corrected. A pump rated for 10 to 15 years can fail in 2 to 3 years if short-cycling continuously. See the well pump short cycling guide for the complete diagnostic procedure.
Urgency: High. Short cycling damages the pump motor rapidly. Address it within days, not weeks.
What to do:
Perform the pressure tank pre-charge check (described in the well pump maintenance guide). If the Schrader valve releases air normally and pre-charge adjustment does not resolve the short cycling, the tank diaphragm has likely failed and the tank needs replacement. If the tank is replaced and short cycling continues, the pressure switch or pump may be the cause.
Air Spitting or Sputtering From Faucets
What you observe:
Faucets spit or sputter when first opened, releasing air before water flows normally. This may happen consistently or only at certain times of day or after periods of high water use.
What it means mechanically:
Air in the water lines typically has one of three causes: a failing pressure tank diaphragm allowing air to enter the water side, a drop in the well water level to near the pump intake (pump cavitation), or a crack in the drop pipe. Pump cavitation is the most serious because the pump relies on water for cooling — remove the water and the motor temperature rises quickly to a point of damage.
Urgency: High when accompanied by reduced flow or during drought conditions. Persistent air spitting warrants professional evaluation promptly.
What to do:
Note when the air spitting occurs and report this pattern to the professional. Do not run the pump continuously if you suspect it is drawing air. See the well running dry guide if you suspect yield is the issue.
Discolored or Sediment-Laden Water
What you observe:
Water that has been clear suddenly appears brown, rust-colored, or muddy. You may also notice sediment or grit in the water that was not present previously.
What it means mechanically:
Sudden discoloration indicates iron from corroding well casing or pump components, or the pump drawing from the very bottom of the available water column and pulling sediment. Running a pump in sediment-laden water dramatically accelerates impeller wear. Sudden discoloration in an older pump may also indicate internal pump corrosion.
Urgency: High for sudden onset, especially brown or muddy water. Stop drinking the water until it has been tested. Do not run the pump continuously if the water is muddy. See the how to test your well water guide for the correct testing procedure after a water quality change.
What to do:
Run the water for several minutes to see if it clears. If it does not clear within 5 to 10 minutes of running, call a professional. Do not drink the water until you have a clean test result. Have the water tested and the well inspected.
Higher Electricity Bill With No Change in Usage
What you observe:
Your electricity bill has increased noticeably — 20 to 30 percent or more — without any obvious explanation such as new appliances, increased occupants, or a change in season.
What it means mechanically:
A failing pump motor draws more electrical current than a healthy one. As motor windings degrade, bearing friction increases, or impellers wear, the motor compensates by drawing more power. A pump that previously drew 8 amps may draw 12 to 14 amps as it nears failure. A pump that is short-cycling also increases electricity consumption significantly.
Urgency: Moderate. An unexplained electricity increase is a diagnostic signal worth investigating, but it is not an emergency in isolation.
What to do:
Review your electricity bills for the past 12 months and identify when the increase began. A licensed well contractor can perform an amp draw test and compare it to the pump's rated specifications.
Unusual Sounds From the Pressure Switch or Control Box
What you observe:
You hear clicking, buzzing, or rapid on-off sounds coming from the pressure switch or the control box. The sounds may occur constantly or in rapid repetitive bursts.
What it means mechanically:
Rapid clicking from the pressure switch is the audible sound of short cycling. Buzzing or humming from the control box that is louder than normal indicates the capacitor or relay is working harder than it should. Control box components are rated for 10 to 15 years. Grinding or squealing sounds from the pump area can sometimes be heard through the plumbing when bearing failure or impeller damage is severe.
Urgency: High for buzzing or humming from the control box that is new or increasing. Electrical issues can damage the pump motor. Call a professional promptly.
What to do:
Note exactly what you hear and where — pressure switch vs. control box — and when the sounds occur. Do not attempt to open or service the control box yourself. The 240-volt wiring can cause serious injury. Call a licensed well contractor.
Complete Loss of Water
What you observe:
You turn on a faucet and nothing comes out, or the flow drops to essentially zero. This is a sudden onset rather than a gradual decline.
What it means mechanically:
Complete loss of water has several possible causes ranging from simple to serious. In order of likelihood:
- The circuit breaker to the pump has tripped — check this first
- The pressure switch has failed in the open position
- The control box has failed
- The pump motor has burned out entirely
- The well has run dry or the water level has dropped below the pump intake
- The drop pipe has separated underground
Urgency: Immediate. Loss of water is an emergency. Do not attempt to repeatedly cycle the breaker if the pump is not responding.
What to do:
- Check the circuit breaker first. If it has tripped, reset it once. If it trips again immediately, do not reset it again — call a professional.
- Check the pressure gauge on the pressure tank. If it reads zero, the system has lost pressure entirely. If it reads in the normal range, the problem may be downstream of the tank.
- Call a licensed well contractor for same-day service.
When to Turn the Pump Off Immediately
These specific situations require shutting off the pump at the circuit breaker and calling a professional before running it again:
The circuit breaker trips and resets only to trip again
You smell burning from the control box or pressure switch area
Water is brown or muddy and does not clear after 10 minutes of running
Air spitting is accompanied by significantly reduced flow during dry weather
The pump makes grinding or mechanical sounds audible through the plumbing
You have no water and resetting the breaker does not restore it
Running a pump through these conditions accelerates motor damage and can turn a repairable problem into a full replacement situation. Shut off, call a professional.
DIY Diagnosis vs. Professional Diagnosis
What Homeowners Can Assess
- Pump age — from the well completion record or service history
- Pressure gauge readings during normal operation
- Whether the circuit breaker has tripped
- The pressure tank pre-charge and whether the tank is waterlogged
- Whether the pressure switch is clicking rapidly
- Electricity bill trend over the past 12 months
- Water color and clarity
What Requires a Professional
- Amp draw test — measuring actual motor current draw versus rated specifications
- Flow rate test — measuring actual pump output in gallons per minute
- Water level measurement — determining static and pumping water levels
- Drop pipe inspection — determining whether the pipe is intact
- Pump pull — physically removing the pump for visual inspection
A diagnostic visit from a licensed well contractor typically costs $150 to $300 and covers most of the professional assessments above. This is money well spent before committing to a pump replacement — the diagnostic visit determines whether the pump, the pressure tank, the pressure switch, the control box, or the well itself is the actual problem.
Repair vs. Replace: The Decision Framework
When a professional diagnosis confirms the pump is failing, the repair vs. replace decision depends on three factors:
Age
A pump under 8 years old with a specific, isolated failure (a burned winding from a lightning strike, a failed bearing from a manufacturing defect) may be worth repairing if the repair cost is less than 50 percent of replacement cost. A pump over 12 years old with wear-related failure should almost always be replaced — repairing one component on an aged pump often leads to another failure within months.
Repair Cost as a Percentage of Replacement Cost
A full pump replacement (pump, drop pipe labor, installation) typically costs $800 to $2,500 depending on well depth and pump size. If a repair quote exceeds 50 percent of replacement cost on an older pump, replacement is usually the better investment.
Water Quality
In areas with acidic, corrosive, or high-iron water, pump components deteriorate faster. If water quality caused the failure, the same conditions will cause the same failure in a repaired pump. Address the water quality issue as part of the replacement, not as an afterthought.
See the well drilling cost guide if the diagnostic reveals the well itself — rather than the pump — needs replacement or significant rehabilitation.
Once you have confirmed your pump is failing, use our well pump replacement cost calculator to estimate the replacement project. Walking into the quoting process with a planning estimate based on your specific pump type, well depth, and region helps you spot inflated bids and have more informed conversations with contractors.
Frequently Asked Questions
How do I know if my well pump is failing?
How long does a well pump last before it needs to be replaced?
What causes a well pump to fail?
What does a failing well pump sound like?
How much does it cost to replace a well pump?
Can a well pump be repaired rather than replaced?
Should I turn off my well pump if I think it is failing?
What is the difference between a failing pump and a failing pressure tank?
Glossary
Impeller
The rotating component inside a submersible pump that moves water upward through centrifugal force. A submersible pump contains a stack of impellers, each adding pressure to the water. Impellers are made of plastic or stainless steel and wear over time, particularly when the pump operates in water containing sand or sediment. Worn impellers reduce pump output and pressure without causing the pump to fail entirely.
Control Box
The electrical panel that controls the starting and running of a submersible well pump motor, typically mounted on the wall near the pressure tank. Contains a start capacitor, a run capacitor, and relay contacts. Control box components are rated for 10 to 15 years of service and are one of the more commonly replaced components in an aging well system.
Pump Cavitation
The condition in which a submersible pump draws air along with water, typically because the water level has dropped near or below the pump intake screen. Cavitation causes air spitting at faucets, reduced pressure, and a characteristic rattling or vibration. It is damaging because the pump relies on the water it is pumping for cooling. Prolonged cavitation can destroy a pump motor in hours.
Amp Draw Test
A professional diagnostic procedure in which a technician uses a clamp-style electrical meter to measure the actual current the pump motor is drawing during operation. The result is compared to the pump's rated amperage. A motor drawing significantly more than rated amperage is working harder than designed, typically due to worn bearings, degraded windings, or impeller wear. One of the most reliable indicators of pump motor health.
External Resource
The National Ground Water Association (NGWA) maintains the industry standard guidance for well pump diagnosis, replacement, and contractor qualification. Their well owner resources include guidance on finding a licensed well contractor, understanding pump specifications, and navigating the pump replacement process. The NGWA also operates a contractor search tool for finding certified well service professionals by state and county.
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