Pre-Move-In Sewer & Drainage Guide

Drainage and sewer lines show predictable wear as they age. Typical problems include:

•Root intrusion, where tree roots enter joints or cracks and block the main sewer line.
•Pipe corrosion, especially in older cast-iron or clay systems.
•Sagging or “belly” in the sewer line, causing standing water and recurring blockages.
•Grease and scale buildup reducing flow and causing slow drains.
•Cracked or collapsed sections of pipe that require excavation to repair.
•Improper past repairs or mismatched materials creating unstable joints.


A few simple observations can help you detect early signs of drainage issues. Before move-in:

•Run water in multiple fixtures simultaneously to see if toilets bubble or drains slow down.
•Flush all toilets and listen for gurgling sounds—often a sign of partial sewer blockage.
•Check for sewer odors in bathrooms, kitchens, or basements, especially after running water.
•Inspect outdoor clean-outs to confirm they’re accessible and not clogged or leaking.
•Look for wet patches in the yard, which may indicate a leaking main sewer line.


Only specialized equipment can reveal the true condition of a home’s sewer line. A drainage professional should:

•Perform a full sewer camera inspection from the house to the street connection.
•Document pipe materials, noting cast iron, clay, Orange-burg, or PVC and their condition.
•Identify cracks, intrusions, and collapse risks inside the main line.
•Scan for sagging or pooling water, which can cause recurring backups.
•Review the slope and alignment to confirm proper drainage flow.


Ensure toilets and sinks drain smoothly, no unusual odors exist, and clean-out access points are visible and functioning. Schedule a sewer camera inspection—especially in homes with large trees or older pipe materials—to detect hidden failures before they escalate. If the sewer line shows signs of wear, budget for cleaning or partial repair soon after move-in. Taking these steps guarantees a dependable drainage system and prevents the most disruptive plumbing emergencies an older home can experience.