A submersible well pump is the most important appliance you own that you will never see. It hangs hundreds of feet down the casing, runs thousands of hours a year, and when it dies, your house has no water — usually on a holiday weekend, at emergency service rates.
Here's the thing: pumps almost never die without warning. They telegraph failure for weeks or months first. Learn the seven signals, and a $1,200 controlled replacement never becomes a $3,000 emergency.
The 7 Warning Signs
1. Sputtering, spitting faucets. Air in the lines means either the water level is dropping to the pump intake (is the well running dry?), a cracked drop pipe, or a failing check valve letting the column drain back. Cost of ignoring: a pump that runs dry burns out its motor — the $150 pipe repair becomes a $1,200 pump.
2. Low or fluctuating water pressure. Gradual pressure decline points at a wearing pump impeller, a clogging intake screen, scale in the pipes — or simply a waterlogged pressure tank, which is the cheap fix. Rule the tank out first, always.
3. Rapid clicking / short cycling. The pump kicking on and off every few seconds is almost always the pressure tank's air charge gone — but every short cycle hammers the motor windings and the pressure switch contacts. This is the most-ignored, most-expensive-to-ignore item on this list: a $10 air recharge or $250 tank neglected until it kills a $1,200 pump.
4. The pump never shuts off. Constant running means it can't reach cutoff pressure: a leak somewhere between pump and switch, a dropping water table, a worn pump, or a misadjusted pressure switch. A pump that runs 24/7 is also burning ~$50–$100/month in electricity while it grinds itself down.
5. A spiking electric bill. The stealth version of #4. If nothing else changed and your bill jumped, clamp the pump circuit: an amp-clamp multimeter reads the draw without touching a wire. Compare against the amps on the pump's spec plate or well report — high amps mean a motor working too hard (failing bearings, blocked impeller); wildly low amps can mean it's spinning without pumping.
6. Dirty, sandy, or cloudy water. A pump suddenly pulling sediment may be sitting too close to a dropping water level, or the well screen is failing. Sand is also a pump-killer — it machines away impellers from the inside. See sudden cloudiness for the diagnostic tree.
7. Strange noises or vibration at the pressure tank. Grinding, growling, or rapid banging traveling up the drop pipe = bearings or cavitation. This one has no cheap interpretation; get ahead of it.
Diagnose Before You Spend
Half of "pump failures" are actually a $25 pressure switch or a tank air charge. Work in this order, cheapest first:
- Check the pressure tank air charge (2-minute test with a tire gauge — walkthrough here).
- Inspect the pressure switch for burned contacts and correct cut-in/cut-out.
- Clamp the amps and compare to the nameplate.
- Only then talk pump replacement.
If it is the pump: a typical residential submersible well pump runs $250–$700 for the unit; pulling and setting it is a pro job for deep wells (figure $1,000–$2,500 all-in) but genuinely DIY-able on shallow wells with a helper and a pump puller. Match horsepower, voltage, and GPM to the old unit and your well's yield — oversizing a pump in a low-yield well is how you buy the next pump prematurely.
Your Action Plan
- Today, while everything works: write down your baseline. Pressure gauge reading at cut-in and cut-out, how long the pump runs to recover, the amp draw if you have a clamp meter. Five minutes.
- Twice a year: repeat the readings. Failure shows up as drift — recovery taking 90 seconds where it took 60, amps creeping up.
- At any warning sign: run the cheap-first diagnostic order above.
- Know your pump's age. Submersibles average 10–15 years. Past year 12, keep replacement money mentally earmarked.
Baselines and drift only work if the old numbers exist somewhere better than memory. Log the readings in the WellKept app each time — pump install date, cut-in/cut-out, recovery time, amp draw — and the app's history turns "does the pump seem slower to you?" into an answer. Set a twice-yearly reminder and the checkup actually happens.
Frequently Asked Questions
What are the first signs of a well pump going bad? The earliest signs are usually pressure-related: sputtering faucets, slowly declining pressure, the pump running longer to recover, or short cycling. A rising electric bill with no other explanation is the classic silent symptom — the pump working harder to do the same job.
How long do well pumps last? Submersible pumps typically last 10–15 years; jet pumps 8–12. Water with sand or sediment, low-yield wells that force frequent cycling, and waterlogged pressure tanks all shorten pump life significantly — tank maintenance is the cheapest pump-life insurance there is.
How much does it cost to replace a well pump? The pump itself runs $250–$700 for typical residential submersibles. Professional replacement including pulling the old pump runs $1,000–$2,500+ depending on depth. Emergency weekend service adds hundreds more — which is the financial case for catching the warning signs early.
Why is my well pump running but no water is coming? Common causes, roughly in order: the well's water level has dropped below the pump intake, a broken drop pipe or fitting down-hole, a failed check valve, a clogged intake screen, or a pump spinning with stripped/worn impellers. If the pump runs dry, shut it off — running dry destroys the motor.
Can I replace a well pump myself? On shallow wells (under ~100 feet) with poly drop pipe, a fit DIYer with a helper and a pump-pulling tool can do it. Deep wells with steel pipe need a truck-mounted puller — hire it out. Either way, kill power at the breaker and photograph the wiring before disconnecting anything.