The answer to 'sewer line frozen' is that a frozen sewer line is a common plumbing problem during cold weather. This happens when the water in the sewer line freezes, blocking the flow of wastewater from your home. Common causes include inadequate insulation, a shallow sewer line, or an exposed pipe that is not protected from the cold.
Symptoms of a frozen sewer line include slow draining sinks and tubs, gurgling sounds from plumbing fixtures, and sewage backing up into the home. If caught early, you may be able to thaw the line yourself using a heat lamp, heating pad, or pouring hot water down the drain. However, if the line is completely frozen or the problem persists, it's best to call a professional plumber to diagnose and fix the issue.