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What is drain backup?

Asked by Anonymous Oct 02, 2026 6 views 1 answers
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Answered Oct 05, 2026
A drain backup occurs when wastewater traveling through your household plumbing pipes is blocked or restricted, forcing the liquid to reverse direction and rise upward out of plumbing fixtures—such as sinks, tubs, showers, or floor drains—rather than exiting down into the municipal sewer main or septic tank. Backups can be isolated to a single fixture branch line or involve the main sewer line, which causes widespread flooding across multiple rooms. Verification: Identify whether the backup affects a single fixture or multiple drains to determine the severity of the restriction.
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