The pump runs. The basement owner feels reassured. Outside, the outlet is disappearing into a growing lump of ice. Those two observations belong in the same inspection.
Follow the water beyond the wall
Mississauga's stormwater guidance notes that winter conditions can block drainage and directs sump discharge onto the property, not City roads or ditches. Other municipalities have their own requirements. Check the local rule and the installed system together.
Ask for a winter operating plan
Have the contractor assess outdoor pipe routing, low points, outlet position, and the manufacturer's requirements. Keep the approved discharge point visible and away from snow piles. Do not pour boiling water into uncertain pipework, use a flame, or improvise electrical heating. A blocked line or rising basin needs prompt professional attention.
Before the next step
- Locate the outlet before snow covers it.
- Review trapped-water and freezing risks with the installer.
- Keep the approved destination clear without creating an ice hazard.
Listen to the pump, then look outside. Backup power cannot compensate for a discharge route that has stopped carrying water.