When should I replace my sump pump?

At 7–10 years for a submersible and 10–15 for a pedestal, on schedule, in a dry week. Sooner if it runs constantly or cycles every minute or two, grinds or hums without pumping, sits in rusty or slimy water, fails a five-gallon bucket test, or was overwhelmed in the last storm. A pump past its working life is not broken yet; it is due.

What does a sump pump replacement cost in 2026?

A like-for-like swap runs $400–$1,200 installed, including a check valve. The pump alone is $100–$250 for a pedestal, $150–$400 for a 1/3 HP submersible, and $200–$500 for 1/2 HP. A new pit and discharge line where none existed is $2,000–$5,000. A battery backup pump is $600–$1,800 installed and a water-powered backup $500–$1,500.

How do I test a sump pump?

Pour about five gallons of water into the pit, slowly. The float should rise, the pump should start, the water level should drop quickly, and the pump should shut off on its own. Slow to start, slow to empty, or failing to shut off means replace. Test before the spring thaw and before the fall rains.

Is a battery backup sump pump worth it?

Yes if the basement is finished or holds anything you would pay to dry out. The storm that floods the basement is often the one that cuts the power, and a primary pump with no power is a hole in the floor. A battery backup is $600–$1,800 installed and runs for hours on a charged deep-cycle battery; a water-powered backup, $500–$1,500, needs no battery but requires municipal water pressure. Most standard homeowners policies exclude sump overflow without a water-backup endorsement, so the backup pump is usually cheaper than the claim you cannot make.

When should you replace a sump pump?

Q: How long does a sump pump last?

Submersible pumps last 7–10 years and pedestal pumps 10–15, sometimes longer, because the motor stays out of the water. Float switches are often the first thing to go and are a $30–$75 part. Backup batteries last 3–5 years. Heavy run time in a high-water-table house shortens all of it; if the pump runs most days, use the low end.

A sump pump is the one appliance in the house that fails silently and then gets tested by a storm. It sits in a pit, runs when the water table rises, and gives you no signal in between. So the question is not whether it works today, which a bucket of water will tell you, but how much longer it is likely to keep working, and what it costs if the answer turns out to be "not through the next wet week." That arithmetic almost always favors replacing early.

Replace it now if any of these are true

It is 7–10 years old and submersible, or 10–15 and a pedestal. That is the working life. A pump past it is not broken; it is due.
It runs constantly or cycles every minute or two when it is not raining. Either the float switch is stuck, the check valve has failed and the same water is going up and down the pipe, or the pump is undersized for the water it is seeing.
It grinds, rattles, or hums without pumping. A worn impeller or a seizing motor. Once a motor runs hot it is on its last cycles.
The pit water or the pump is rusty or coated in orange slime. Iron bacteria and mineral scale clog the intake and the float. A pump in that water is on a shorter clock than the calendar says.
It fails the bucket test. Pour five gallons in, slowly. The float should rise, the pump should start, the water should drop fast, and it should shut off. Slow to start, slow to empty, or will not shut off means replace.
It has already flooded once. A pump that was overwhelmed or quit in the last storm has told you what it will do in the next one.

The one repair worth making on an otherwise healthy pump is the float switch, which is often the first thing to go. A tethered float that hangs up on the pit wall is a $30–$75 part, or $150–$300 with the service call. Everything else on a pump that costs under $400 new costs more to fix than to replace.

Replace on schedule, not on failure

Most systems in a house can be run to failure because failure is inconvenient, not expensive. A sump pump is the opposite. It fails at the moment of maximum load, during the storm or the thaw, which is also the moment the plumber is booked out and the basement is filling. A like-for-like swap is $400–$1,200. Drying out and rebuilding a finished basement after a flood starts around $2,000 for wet carpet and fans and passes $10,000 once drywall, flooring, and contents are involved. The cheapest cleanup costs more than the most expensive swap, and that is before you find out about the claim.

Insurance rarely saves you here. Most standard homeowners policies exclude water that backs up through a drain or overflows a sump unless you have added a water-backup endorsement, which runs roughly $50–$250 a year for $5,000–$25,000 of coverage. Check your declarations page. If the endorsement is not there, the pump is the policy.

How long does a sump pump last?

Submersible pumps: 7–10 years. Sealed motor in the water; quieter, and the default under a finished basement. The seal is what eventually goes.
Pedestal pumps: 10–15 years, sometimes longer. Motor on a post above the pit, so it stays dry and is easy to service, at the cost of noise and a pit you cannot cover.
Float switches: often the first failure on either type, and the cheapest part in the system.
Backup batteries: 3–5 years, and they should be tested when the pump is.
Check valves: 5–10 years, or sooner if you hear water running back into the pit after every cycle.

Run time shortens all of it. A pump in a house with a high water table that cycles all spring is doing ten years of work in five. If yours runs most days, treat the low end of each range as the number.

What it costs in 2026

Pump only: $100–$250 for a pedestal, $150–$400 for a 1/3 HP submersible, $200–$500 for 1/2 HP.
Like-for-like replacement, installed: $400–$1,200, including a new check valve.
New pit, pump, and discharge line where there was none: $2,000–$5,000.
Battery backup pump: $600–$1,800 installed. Runs off a deep-cycle battery when the power is out, which is when the pump is most needed, because the storm that floods the basement is often the one that takes the lines down.
Water-powered backup: $500–$1,500 installed. No battery to die; it runs on municipal water pressure, using roughly a gallon of city water for every two it lifts, so it needs a city supply, not a well.
Water alarm or Wi-Fi pit sensor: $30–$100. The cheapest thing on this list and the only one that tells you the pump has stopped before the floor does.
Diagnostic or service call: $150–$300.

See our methodology for how we build these bands. On horsepower: 1/3 HP handles most houses. Go to 1/2 HP for a high water table, a long or steep discharge run, or a pit that fills fast in a storm; a pump that has to run flat out to keep up is the one that burns out.

The timing that actually matters

Test twice a year, before the spring thaw and before the fall rains, with the bucket. Replace at the age line whether it passes or not, and pick a dry week to do it so you are choosing the plumber rather than the plumber choosing you. If the basement is finished, or holds anything you would mind losing, add the battery or water-powered backup on the same visit; the second trip costs more than the second pump. This is the same logic as replacing a water heater before it lets go and fixing the drainage before a foundation crack grows: the cheap part protects the expensive one, and only while it works.

The bottom line

Replace a sump pump at 7–10 years for a submersible and 10–15 for a pedestal, sooner if it runs constantly, cycles fast, grinds, sits in rusty water, or fails a five-gallon bucket test. Do it in a dry week, on your schedule. The swap is $400–$1,200; the flood it prevents starts at $2,000 and is usually not covered. A $30 water alarm and a $600–$1,800 backup pump are the rest of the system, not extras. If this is part of a longer list, our home maintenance budget guide shows where it fits.