There are a number of ways you can help prevent sewer backups:
Do not put cooking grease down the drain
Cooking grease that hardens in the sewer pipes and creates a plug causes most blockages - hot water will not melt fat away.
Use the garbage disposal sparingly
Put food scraps in the garbage, or compost them to reduce the amount of garbage in your trashcan.
Refrain from planting trees or large shrubs near sewer lines
Roots grow toward breaks and cracks in search of a water source. If roots get inside the pipes, they often form “root balls” that clog a line.
Inspect backwater valves annually
A backwater valve is a plumbing fixture that acts as one-way stopper. It allows wastewater to leave your property, but prevents it from coming back in when there is a blockage.
Click here  for more tips on what you can do to help prevent sewer backups.