Basement sewage backups are most frequently caused by tree root intrusion into underground lateral pipes, structural pipe collapses, accumulation of grease and solid foreign objects, or municipal sewer main surcharges during heavy rainstorms. Because basement floor drains sit at the lowest elevation in the home's plumbing network, any downstream restriction forces wastewater and raw sewage to rise and exit out of the lowest available drain openings. Verification: Schedule a professional video scope inspection of your underground sewer line to identify potential vulnerabilities.
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