Why Does My Sewage Backups Get Worse During Winter?

The top reason for winter backups is ground frost. When the soil freezes, it can encase and freeze the water inside your sewer lateral, the pipe running to the main city line. This creates a solid blockage that stops all waste flow.

A partial freeze can also narrow the pipe's interior, slowing drainage significantly. As more water and waste enter the system, it backs up at this choke point. Thawing ground in spring may temporarily worsen the problem as ice melts and moves blockages.

If sewage backs up, stop using all water immediately. Do not flush toilets, run sinks, or use appliances like washing machines or dishwashers. This prevents adding more volume to the blocked system. Then, locate and turn off your home's main water shutoff valve to prevent accidental use. This is a critical first step to limit the damage.

Sewage contains harmful bacteria and viruses. Avoid contact with the water and keep children and pets away. Do not attempt to clear a main line clog with chemical drain cleaners, as they can damage pipes and pose a safety hazard without solving the root issue.

Prevention starts with mindful habits. Never pour cooking grease down the drain; instead, let it cool and dispose of it in the trash. Consider installing drain screens to catch food particles. Be conscious of water usage during peak times when you have guests. Spacing out laundry loads and showers can help avoid overwhelming the system.

For a more permanent solution, a plumber can perform a video inspection of your sewer line. They can identify issues like cracks, bellies, or root intrusions. Regular professional drain cleaning before winter can also help keep lines clear and flowing freely. In some cases, insulating exposed pipes or addressing grading issues around your home's foundation can provide additional protection against freezing ground conditions.