Sewer Line Inspection: When You Need One and What It Costs

Most homeowners never think about the sewer line until something goes wrong. By then, the repair is often expensive and disruptive. A sewer line inspection is a relatively inexpensive diagnostic tool that can catch problems early - and it is almost always worth doing before buying an older home.

What a Sewer Line Inspection Is

A sewer inspection involves a plumber running a small camera - mounted on a flexible cable - through your drain cleanout and down into the main sewer line. The camera transmits live video to a monitor, letting the plumber see the condition of the pipe from the inside.

The inspection covers the main line from where it exits the house to where it connects to the municipal sewer or your septic system. It typically takes thirty minutes to an hour.

What the Camera Looks For

A sewer camera inspection reveals:

• Root intrusion - tree roots are one of the most common causes of sewer line damage, especially in older neighborhoods with large trees. Roots enter through small cracks and expand over time.
• Cracks or fractures - pipes shift as soil settles, and older clay or cast iron pipes can crack.
• Bellying - a section of pipe that has sunk and now holds standing water, slowing drainage and accumulating debris.
• Buildup - grease, scale, or debris that has accumulated enough to narrow the pipe diameter.
• Offset joints - where pipe sections have shifted out of alignment at a connection point.
• Collapsed sections - severe damage where the pipe has caved in.

When to Get a Sewer Inspection

Before buying a home. This is the most important use. A sewer line problem that is not disclosed before purchase becomes entirely the buyer's problem. Older homes - particularly those built before the 1980s with clay or cast iron pipes - are higher risk.

After recurring slow drains or clogs. If multiple drains in the house are slow, or if you have had the main line snaked more than once in a few years, an inspection tells you whether there is an underlying structural problem.

After a major root removal. If a plumber has removed roots from your line, an inspection afterward confirms whether the pipe itself is damaged.

After heavy rains cause backups. If stormwater repeatedly causes sewage to back up into your home, there may be a crack or joint offset allowing water infiltration.

If your home is more than forty years old. Many homes built before the mid-1980s have clay or cast iron sewer lines that are approaching the end of their useful life.

What a Sewer Line Inspection Costs

Sewer line inspection cost typically falls in the range of $100 to $350, though prices vary by region, line length, and the plumbing company. In California and other high-cost states, expect prices toward the higher end of that range.

Some plumbers include a recording of the inspection footage. Ask for this - if repairs are needed, having the video helps you get accurate quotes from multiple contractors and understand exactly what is being fixed.

What Happens If Problems Are Found

Not every finding requires immediate, expensive repair. Minor buildup may be cleared with hydrojetting (a high-pressure water flush). Root intrusion caught early can sometimes be handled with root-clearing and a follow-up inspection a year or two later. More serious damage - cracks, collapse, offset joints - may require pipe repair or full replacement.

If the inspection finds significant issues, get at least two quotes for repair. Ask whether trenchless repair methods are available. Trenchless options (pipe lining or pipe bursting) avoid digging up the yard and are often less disruptive, though not always cheaper.

Bottom Line

Sources and editorial notes

Prices and permit requirements vary by location, property, equipment, and scope. Treat price ranges as planning estimates and confirm current requirements with the relevant authority and contractor.

• California Contractors State License Board - when a contractor license is required

Related guides

• Sewer Backup in a Home: First Steps, Cleanup Risks, and Who to Call
• Roof Inspection After Buying a Home: What the Report Should Cover
• Ice Maker Leaking: Supply Line, Valve, and Drain Problems

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