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Sump Pump Repair

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A sump pump spends much of the year idle, then has to work hard for days at a time during spring thaw or a summer storm. That's why problems tend to go unnoticed until the worst possible moment: a float that stuck months ago, a check valve that failed quietly, or a motor that finally gives out with water rising in the pit.

Sump pump repair means finding out why a pump won't start, won't stop or can't keep up, then fixing or replacing the part responsible: the float switch, the check valve, the discharge line, the power supply or the pump itself. Quite often the pump is fine and the trouble lies around it, in a frozen outdoor line, a pit full of silt or an outlet that lost power.

If water is climbing toward the top of the pit right now, treat it as an emergency: stay clear of electrical hazards, slow the water down if you safely can and call for help. Otherwise, a few safe checks will tell you a lot about what's wrong before a plumber arrives.

Signs your sump pump is failing

  • The pump runs nonstop, even in dry weather, or hums without moving any water.
  • It doesn't start when the water reaches its usual level in the pit.
  • It switches on and off every few moments, a pattern known as short cycling.
  • It grinds, rattles or vibrates, or makes a loud thud each time it shuts off.
  • The water stays high in the pit, or the floor around it is wet after a storm.
  • The pit holds rust, heavy silt or an oily film, or the motor gives off a hot or burning smell.
  • The backup pump's alarm goes off, or you find the backup has been doing the work on its own.

Common sump pump problems and what causes them

  • Stuck float switch: the float catches on the pit wall, the power cord or debris, so the pump never starts, or never stops.
  • Failed check valve: the water in the discharge pipe falls back into the pit whenever the pump stops, so it restarts again and again.
  • Frozen or blocked discharge line: ice, snow or a crushed hose outside keeps the water from leaving, and the pump runs without emptying the pit.
  • Clogged intake: silt, gravel and debris carried in by the weeping tile settle at the bottom of the pit and choke the pump.
  • Lost power: a tripped breaker, a loose plug or an outage stops a pump that is otherwise in good shape.
  • Air lock: air trapped between the pump and the check valve can keep some pumps from moving water even though the motor runs.
  • Worn motor or impeller: after years of cycling, the pump moves less water, gets louder or overheats.

How to test a sump pump safely

Most checks take a bucket of water, your eyes and your ears. Never reach into the pit or handle the pump while it's plugged in, and don't touch anything electrical while standing in water. The City of Gatineau recommends checking a sump pump at least twice a year, in spring and fall, and testing the emergency power supply at least once a month by unplugging the pump and then plugging it back in.

  • Lift the lid and look: the pit should be free of debris, the float free to move and the power cord secured out of its way.
  • Pour water slowly into the pit until the float rises; the pump should start, bring the level down quickly and shut off on its own.
  • Step outside while it runs to confirm that water flows out of the discharge pipe and away from the house.
  • Listen as it stops: a hard bang, or water rushing back into the pit, points to the check valve.
  • Confirm that the outlet has power and the breaker hasn't tripped, and leave any work on wiring, outlets or circuits to an electrician.

Sump pump repair or replacement: how to decide

Many sump pump problems are solved without touching the pump itself: freeing or adjusting the float, replacing the check valve, cleaning out the pit and the intake, thawing or rerouting the discharge line, or restoring power. Those repairs make sense on a pump that otherwise runs well and empties the pit quickly.

Replacement becomes the better choice when the motor hums but won't pump, the pump overheats or cuts out on its thermal protection, the housing is cracked or badly corroded, or it takes much longer than it used to to empty the pit. A pump that has already quit once during a storm has also earned its retirement. When replacing it, ask the plumber to confirm that the new pump's capacity suits the water coming in, and whether the check valve and float should be replaced at the same time.

Sump pump and backup power checks before spring thaw

  • Test the main pump and the backup in late winter, while there's still time to get a repair done before the snow melts.
  • Unplug the main pump and confirm that the backup starts on its own and its alarm works.
  • Charge or replace the backup battery as the manufacturer recommends, and check its terminals for corrosion.
  • Clear snow and ice from the discharge outlet and make sure the outdoor section of the line hasn't been crushed or pulled loose.
  • In the fall, before the ground freezes, remove leaves from around the outlet and check that the line drains.
  • Use the clock changes as a reminder: Gatineau suggests timing its twice-yearly checks with the spring and fall time changes.

What to do when the sump pump stops during a storm

  • If water is near outlets, the furnace or the electrical panel, stay out of the basement and have the power cut by your utility or an electrician.
  • If the floor is dry, unplug the pump before freeing a stuck float or clearing debris from the pit, then plug it back in.
  • Check whether the outdoor discharge line is frozen or disconnected, since a pump can't empty a pit into a blocked pipe.
  • Slow the water reaching the foundation by extending downspouts and moving snow away from the walls.
  • Call a plumber who handles emergency sump pump repair, and ask whether they can bring a replacement pump on the first visit.

Sump Pump Repair: frequently asked questions

Why does my sump pump run constantly?

A pump that won't shut off may have a stuck float, a failed check valve that lets the same water fall back into the pit, or a discharge line that is frozen or blocked. During heavy rain or a thaw, long run times can be normal if water keeps flowing in. If it runs with the pit empty, or hums without moving water, unplug it and call a plumber, since the motor can overheat.

Why won't my sump pump turn on?

Start with power: check that the pump is plugged in and that the breaker hasn't tripped. Then look for a float stuck against the pit wall or tangled in the cord. If power reaches the pump and the float rises freely but nothing happens, the switch or the motor has most likely failed and needs a plumber.

How often should I test my sump pump?

The City of Gatineau recommends checking the pump at least twice a year, in spring and fall, including adding water to the pit to see it run, and testing the emergency power supply at least once a month by unplugging the pump. Follow the manufacturer's instructions too, and run a quick test whenever heavy rain or a fast thaw is in the forecast.

Is it normal for water to sit in the bottom of the sump pit?

Yes. The pump starts only when the float reaches its set level, so some water at the bottom is expected. What matters is that the level never gets close to the rim and that the pump brings it down quickly each time it starts.

Why does my sump pump make a loud bang when it shuts off?

The bang usually comes from the check valve slamming shut as the water in the discharge pipe falls back against it. It isn't dangerous in itself, but it strains the pipe and fittings over time. A plumber can replace the valve with a quieter type or add support to the pipe; if water rushes back into the pit instead, the valve has failed.

Sources

  1. Ville de Gatineau: Sump pit with discharge pump

Written by the LokalMatch editorial team. Last reviewed September 10, 2026.

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What affects the cost of sump pump repair

Prices depend on the details of your project. We only publish price ranges when they’re backed by real LokalMatch quote data or reliable sources. Until then, here’s what usually changes the price:

  • Interior or exterior approach
  • Length of foundation wall to excavate or treat
  • Depth, soil conditions and access for equipment
  • Crack repair, underpinning or other structural work
  • Weeping tile, sump pumps and backwater valves
  • Restoring landscaping, driveways or finished basements
  • Testing and safe removal of mould or asbestos, where needed

How to compare plumbers before you hire

  • Choose a contractor who finds the source of the water before recommending a fix, whether that's grading, eavestroughs, cracks or drainage.
  • Ask them to explain the difference between interior and exterior waterproofing for your home, and why they recommend one.
  • For foundation cracks that are wide, growing or uneven, ask whether a structural engineer should assess them first.
  • For mould, asbestos or radon, hire professionals qualified for that specific work, and don't disturb suspect materials yourself.
  • Get a written quote that lists excavation, membranes, weeping tile, sump pumps and restoration of landscaping or finishes.

Questions to ask plumbers before you hire

  • Where do you think the water is coming from, and how did you confirm it?
  • Do you recommend interior or exterior waterproofing for my home, and why?
  • Should a structural engineer look at these cracks or this wall?
  • Does this work need a permit from my municipality?
  • Is your warranty transferable if I sell the house, and what does it cover?
  • How will you restore the landscaping, driveway or basement finishes afterwards?
  • If you find mould or asbestos, how will it be handled and by whom?

When to call a pro for sump pump repair

  • Water on the basement floor or damp walls after rain or snowmelt
  • Foundation cracks that are growing, or walls that bow or lean, which should be assessed by a qualified professional
  • Musty smells or mould that keeps coming back
  • Suspected asbestos in insulation, flooring or pipe wrap: leave it undisturbed and call a qualified abatement professional.

Sump pump repair permits and local rules

Some sump pump repair work needs a permit or has to meet local bylaws. Rules vary by municipality, so ask your pro whether a permit is needed and who will apply for it — and check with your city or town if you’re unsure.

Permits and licensing

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