The single most common cause of residential sewer line backups is tree root infiltration. Underground sewer lateral pipes carry warm moisture and nutrients, attracting tree roots that penetrate tiny pipe joints or micro-cracks. Once inside, roots proliferate rapidly, forming dense blockages that trap toilet paper, grease, and household waste. Other leading causes include structural pipe collapse, broken clay tiles, and flushed non-flushable sanitary items. Verification: Inspect your underground sewer lines with a video camera every few years if large trees are planted near your property.
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