In homes with weeping tile or interior drainage, the sump pump moves groundwater out of the basement and away from the house. Winter is a demanding season for it. Around Brockville and the 1000 Islands area, cold winters bring freezing and thawing, snowmelt and the occasional ice storm, and each of these can affect how a pump works.
This guide covers the most common reasons sump pumps fail in winter, a simple test you can do yourself, general backup options and the signs that something is wrong.
Common Reasons Sump Pumps Fail in Winter
Frozen or blocked discharge lines
The discharge line carries water from the pump to the outside. Where it leaves the house and runs across the yard, it can freeze, especially if water sits in a low spot in the line or the outlet is buried under snow. When the line is blocked, the pump runs but the water has nowhere to go. It may run continuously, overheat or stop working, and the pit can overflow.
A frozen line is also a reason to check where the outlet ends. Water should discharge well away from the foundation and drain freely, so it does not refreeze at the outlet or soak back toward the house.
Power outages during storms
Most sump pumps run on household power. Ice storms and heavy winter weather can bring down power lines, and outages often happen at the same time as rain or melting. Without power, a standard pump cannot run, and the pit can fill and overflow while you wait for power to return.
Stuck or obstructed float switches
The float switch tells the pump when to start. If the float catches on the side of the pit, on the pump cord or on debris, the pump may never switch on, or it may never switch off. Silt, gravel and small objects that fall into an open pit are common culprits.
Pump age and wear
Pumps wear out. Motors, bearings and switches all age, and a pump that has worked for many years can fail without much warning. If you do not know how old your pump is, or it has become noisy or slow, it is worth having it checked.
No check valve
A check valve on the discharge pipe stops water from flowing back into the pit when the pump shuts off. Without one, the same water drains back down and the pump has to move it again, which means more cycling and more wear. In cold weather, water sitting in the line also has more chance to freeze.
A Simple Test You Can Do
Testing a sump pump takes a few minutes and a bucket of water. It is a good habit before winter, before a forecast thaw and again in spring.
- Check that the pump is plugged in and that the cord and outlet are dry and in good condition.
- Remove the pit lid if it lifts off easily, and look for debris around the float.
- Slowly pour water into the pit until the float rises.
- Watch the pump start, lower the water level and shut off on its own.
- Go outside, if it is safe to do so, and confirm water is coming out of the discharge outlet.
- Replace the lid.
If the pump does not start, hums without moving water, runs without stopping, or the water does not reach the outside outlet, something needs attention.
Electrical safety around the pit
Water and electricity do not mix. Keep your hands out of the water while the pump is plugged in. Do not use extension cords that run across a wet floor, and keep the cord and plug off the ground. If there is standing water near the outlet or the electrical panel, do not touch anything; call an electrician. Unplug the pump before reaching into the pit to clear debris.
Backup Options in General Terms
Because outages and heavy water often arrive together, many homeowners consider a backup. The most common option is a battery backup pump. It sits in the pit alongside the main pump and runs on a battery when the power fails or when the main pump cannot keep up. A backup can only run for a limited time on battery, and the battery needs regular checks and eventual replacement.
Other approaches exist, and the right choice depends on your home, your pit and how much water it handles. A professional can explain the options and their limits for your situation.
Signs of Trouble
- The pump runs constantly, or cycles on and off very frequently.
- The pump hums but no water leaves the pit.
- Unusual noises such as grinding, rattling or loud clanking.
- Water standing higher in the pit than usual.
- Ice building up at the outside discharge outlet.
- Damp floors or a musty smell near the pit.
- Visible rust, corrosion or a damaged cord.
When to Call for Help
If your pump fails the bucket test, shows any of the signs above, or you are not sure how old it is, it is time for an assessment. Our sump pump installation service covers new pits, replacement pumps, check valves, backup options and discharge lines routed to drain well away from the house.
If water has already reached the basement floor, start with wet basement repair, which traces the source of the water before recommending a fix. Thaw season can bring more than one problem at once, so our guide to basement leaks during thaw is worth a read too.