7 Signs Your Well Pump Is Failing (And What to Do About Each One)

Well pumps don't just die one day without warning. In most cases, there are clear signs weeks or months before a total failure — if you know what to look for. Catching these early can mean the difference between a $200 repair and a $3,000+ emergency replacement.

We service hundreds of well pumps every year across San Diego, Riverside, and San Bernardino Counties. Here are the 7 warning signs we tell every homeowner to watch for — and what each one actually means for your system.

How Long Do Well Pumps Last?

Before we get into the warning signs, it helps to know where your pump is in its lifecycle. Most residential submersible pumps last 8-15 years, with quality brands like Grundfos and Franklin Electric often reaching the upper end. Jet pumps (above-ground) typically last 5-10 years since they're exposed to temperature changes and don't benefit from the cooling effect of being submerged.

If your pump is over 10 years old and you're noticing any of the signs below, replacement is worth considering even if the pump is still technically running. A pump that's limping along wastes electricity, delivers poor pressure, and will eventually fail at the worst possible time.

The 7 Warning Signs

1. Sputtering, Spitting, or Air in the Water

When you turn on a faucet and get bursts of air mixed with water — sputtering, spitting, or an uneven flow — your pump is drawing air along with water. This usually means one of three things:

• The water level has dropped near the pump intake. During drought or heavy usage, the water table can drop low enough that the pump occasionally sucks air. This is seasonal in many SoCal wells.
• The drop pipe has a crack. A crack in the pipe between the pump and the surface lets air into the system. The pump works fine, but air enters through the damaged pipe.
• The pump is failing. Worn seals or a failing check valve can let air into the system.

What to do: If sputtering is occasional and happens during heavy water use, your well may just be marginal on yield. If it's constant or getting worse, call for a diagnostic — you likely need a water level check and pump inspection.

2. Unexplained Spike in Electric Bills

A healthy well pump is one of the more efficient appliances in your home — typically drawing 750-1,500 watts while running. But a failing pump can draw significantly more power as internal components wear:

• Worn impellers force the motor to work harder to move the same amount of water
• Seized or rough bearings create friction the motor has to overcome
• Short cycling from a waterlogged pressure tank causes the high-amperage startup surge dozens of extra times per day

What to do: Compare your electric bills over the last 6-12 months. An increase of $20-50/month with no other explanation could be your well pump. A technician can measure amp draw and compare it to nameplate specs to confirm.

3. Gradual Loss of Water Pressure

If your water pressure has been slowly declining over weeks or months — showers aren't as strong, the garden hose doesn't reach as far — your pump's impellers are likely wearing down. Submersible pumps use stacked impellers (like small turbines) to push water upward. As these wear from sand, sediment, or simple age, each stage pushes less water.

This is different from a sudden pressure drop (which usually indicates a leak, valve issue, or dry well). Gradual decline points specifically to mechanical wear inside the pump.

What to do: Check your pressure gauge. If the pump can't build to cut-off pressure (usually 50-60 PSI) even with nothing running in the house, the pump is wearing out. Plan for replacement — you have time, but don't wait until it fails completely.

4. Pump Runs Constantly or Won't Shut Off

A pump that runs nonstop is an emergency. It means the pump can't reach the cut-off pressure, so the pressure switch never tells it to stop. Common causes:

• A leak somewhere in the system draining pressure as fast as the pump builds it
• The pump is too worn to reach cut-off pressure
• The well water level has dropped and the pump is partly running dry
• The pressure switch contacts are welded shut

What to do: Turn off the pump at the breaker immediately. A continuously running submersible pump overheats because it relies on water flow for cooling. Then check for obvious leaks and call for service.

5. Rapid Cycling (On-Off-On-Off)

Short cycling — the pump turning on and off every few seconds to minutes — is often a pressure tank problem rather than the pump itself. But it's still a pump-killer. Every startup surge hammers the motor with 3-7x normal amperage. Months of short cycling can destroy a pump that otherwise had years of life left.

What to do: Check the pressure tank first — tap it top to bottom. If it sounds solid all the way through (no hollow air section at top), the bladder has failed and the tank needs replacement. This is a $400-800 fix that can save your pump.

6. Sandy, Silty, or Discolored Water

If your water suddenly starts carrying sand, grit, or unusual sediment, something has changed in your well. Possible causes:

• The pump has dropped lower in the well (safety rope failed, clamp slipped) and is now near the bottom, pulling in sediment
• The well screen is deteriorating and no longer filtering sediment
• The well casing has cracked allowing surface water and sediment in
• The water table has dropped and the pump is pulling from a different zone

What to do: Sand is especially dangerous because it grinds through pump impellers like sandpaper, dramatically accelerating wear. Get a well inspection ASAP. If you're pumping sand, every day you wait shortens your pump's remaining life.

7. Unusual Noises (Grinding, Humming, Clicking)

Different noises point to different problems:

• Clicking from the pressure switch: Rapid clicking usually means the switch is trying to start the pump but can't — possibly a bad capacitor, seized motor, or electrical issue
• Humming without starting: The motor is getting power but the shaft can't turn — stuck impeller, seized bearing, or failed start capacitor. Turn off immediately.
• Grinding or screeching: Bearings are failing. The pump is on borrowed time.
• Banging in pipes (water hammer): Check valve may be failing, causing water to slam back when the pump stops

What to do: Any unusual noise warrants investigation. Humming and grinding are the most urgent — these indicate mechanical failure that will get worse quickly.

Well Pump Replacement

Replacing a submersible pump requires pulling the entire pump assembly out of the well—which can mean pulling hundreds of feet of pipe. Here's what's involved:

1. Disconnect power and plumbing at the wellhead
2. Pull the pump, drop pipe, and wiring from the well (requires a service truck with a hoist)
3. Inspect the old pump and well condition
4. Install new pump, pipe, wire, and safety rope
5. Reconnect and test the system

Pump Replacement Costs (San Diego Area)

• Shallow well (under 150 feet): $1,200–$2,500
• Medium depth (150–300 feet): $2,000–$3,500
• Deep well (300–500+ feet): $3,500–$6,000+
• Emergency/after-hours: Add 25–50% premium

The biggest cost factor is depth—more pipe, more wire, more labor to pull and reinstall. That's why wells in mountain communities like Julian, Palomar Mountain, and Pine Valley often cost more to service.

Choosing the Right Pump

We primarily install Franklin Electric and Grundfos pumps—both are industry-leading brands with excellent reliability records. The right pump depends on:

• Well depth and water level: Determines the total dynamic head (TDH) the pump must overcome
• Required flow rate: Based on household size and usage (5–15 GPM for most homes)
• Well yield: The pump should never exceed the well's sustainable production rate
• Power availability: Standard 230V single-phase for most residential. Larger pumps may need three-phase.

Extending Pump Life

• Install a properly sized pressure tank to reduce cycling
• Use a pump protection device (low-water cutoff, cycle sensor)
• Maintain proper voltage—install a surge protector at the control box
• Have the system inspected annually by a licensed contractor