This is from FAQ of Mississauga city. Seems the house owner is helping the city to clean the sidewalk but not responsible for.
Do we have to clear our own sidewalk from snow and ice?
Answer
Budget constraints do not allow us to plow all City sidewalks. Therefore, we depend on residents to assist in helping keep everyone in our community on the move by clearing the walks adjacent to their properties. If you require more information call the Works Division at 905-615-3000.