Sump Pump Maintenance: Don’t Wait for the Alarm

In Winnipeg, your sump pump is not a luxury appliance — it’s infrastructure. During the spring thaw, and during heavy summer rainfall events, your sump pump may be the only thing standing between a dry basement and a $15,000–$30,000 insurance claim.

The problem is that sump pumps are easy to forget about because they live in a hole in your basement floor and work silently. Most homeowners don’t think about their pump until they hear it running constantly, until it fails, or until they walk downstairs and find water on the floor. At that point, you’re in emergency mode — calling every pump supplier in Winnipeg on a Sunday morning in April while water is rising.

A simple maintenance check, done twice a year, prevents this scenario almost entirely.

When to Check Your Sump Pump

The two best times are:

Early March, before the spring thaw begins. This is when you most need your pump to work, and there’s still time to get it serviced if you find a problem. During spring runoff, pump failure during peak water table conditions can mean a completely flooded basement within hours.

Early October, before freeze-up. The fall check is less critical for immediate pump performance but ensures you head into winter knowing the system is in good shape, and gives you time to address any issues before spring.

Step 1: The Bucket Test

This is the quickest and most reliable test you can do.

Pour a full 5-litre bucket of water slowly into the sump pit. Watch the float switch (the ball or rod connected to the pump that rises with water level). It should rise with the water level, trigger the pump at the appropriate height, and the pump should empty the pit within 30–60 seconds.

If the pump doesn’t trigger: the float switch may be stuck to the side of the pit or tangled in the pump’s power cord. Gently reposition it and try again. If it still doesn’t trigger, the switch may need replacement.

If the pump triggers but doesn’t discharge or discharges weakly: the impeller may be clogged with debris, or the pump may be losing capacity — a sign it’s nearing end of life.

If the pump triggers and works fine but takes unusually long to clear: this is normal if you have a large pit or if the previous test was recent (the pit may not have fully drained). But if clearing time has noticeably increased from previous tests, the pump may be struggling.

Step 2: Check the Discharge Line

Go outside and find where your sump pump discharge pipe exits the foundation — usually a 1.5 to 2-inch pipe emerging through the wall above grade or running under the siding.

Confirm the line is not frozen. In Winnipeg winters, discharge lines can freeze solid if the line doesn’t maintain a continuous slope away from the house, if it runs through a cold zone, or if the pump runs infrequently enough that standing water in the line freezes between cycles. A frozen line means your pump is running against a closed system — burning out the motor in hours.

Confirm the discharge point is at least 2 metres (6 feet) from the foundation, and ideally more. Discharge water that drains back toward the house ends up re-entering the sump pit in a cycle that keeps your pump running constantly — wasting energy and shortening pump life.

Confirm the discharge point is not directed toward a neighbour’s property or onto a municipal sidewalk. This is both a courtesy issue and, in some municipalities, a bylaw compliance matter.

Step 3: Clear the Sump Pit

Over time, silt, gravel, small rocks, and debris settle to the bottom of the pit. With the pump unplugged, reach in and scoop out any visible accumulation. This debris can be drawn into the pump’s intake screen, reducing efficiency and potentially damaging the impeller.

While you’re in the pit, check that the pump is sitting level and that the discharge pipe connection is secure. The pump should not be sitting directly on the pit floor in a way that allows debris to be sucked directly into the intake — most pits have a small base or the pump is positioned above the floor.

Step 4: Listen for Warning Sounds

A healthy pump should produce a steady, even hum when running. Concerning sounds include:

Grinding or rattling: Usually indicates debris in the impeller or worn bearings. The pump is running harder than it should.

Thumping or banging: Can indicate a loose impeller or intermittent obstruction. Also check for water hammer (pressure surge) in the discharge line.

Intermittent running (short cycling): The pump triggers, runs for a few seconds, shuts off, then triggers again shortly after. This means the float switch is triggering at a water level very close to the shutoff level — often caused by a float switch set too low, a leaking pit liner, or ongoing water entry from the foundation.

If your pump is making unusual sounds, have it inspected. Pump repair is far cheaper than pump-caused flooding.

Step 5: Verify the Battery Backup System

This step is often skipped, but it may be the most important one for Winnipeg homeowners.

Power outages are most common during the same severe storms that cause the most rapid water table rise. A power outage during a heavy spring storm event — when your pump is running hard — leaves your basement completely unprotected. If you don’t have a battery backup, you should get one.

Battery backup systems sit beside the primary pump and run on a dedicated battery maintained by a trickle charger. When grid power fails, the backup takes over. Most battery backup systems can run for 6–12 hours depending on how frequently the pump cycles.

To test: plug the primary pump back in after your other checks, then momentarily unplug the main pump to simulate a power failure. The backup should activate automatically within seconds. Reconnect the main pump and confirm the backup returns to standby mode.

If you have an older backup battery (5+ years), consider replacing it. Deep-cycle batteries degrade with age and may not hold adequate charge when you actually need them.

Red Flags That Need Professional Attention

The following situations go beyond regular maintenance and warrant a call to a professional:

Pump runs continuously without the pit water level dropping — suggests the pump has lost capacity or there’s ongoing water entry overwhelming the system
Pit fills unusually quickly — may indicate a crack in your foundation or a failed weeping tile allowing excessive groundwater entry
Water near or above the pit rim — your drainage capacity is inadequate for current conditions; you may need a larger pump or a second pit
Visible cracks in the pit liner — may be allowing water to enter the pit from surrounding soil rather than through the intended drainage channels

A wet basement that keeps coming back despite a working sump pump usually means the underlying drainage system — weeping tile, wall cracks, or the pit itself — needs professional assessment. Learn about our internal waterproofing solutions for chronic basement moisture.

Sump Pump Lifespan

Residential submersible sump pumps typically last 7–10 years with normal use in Winnipeg conditions. In high-use situations — homes near the Red River, properties with high water tables in East St. Paul or Selkirk, or homes where the pump runs for sustained periods each spring — expect a shorter useful life.

If your pump is over 8 years old, budgeting for replacement proactively is wiser than waiting for failure. We install replacement pumps and can recommend appropriate capacity based on your pit size and typical annual water volume.

Questions about your sump system? Call 431-442-2950 or book a free basement assessment online. We inspect sump pits and drainage systems as part of every foundation evaluation.

Related reading:

Sump Pump Maintenance Checklist for Winnipeg Homeowners