Finding out you have a broken sewer line is one of those homeowner moments nobody prepares you for. One day everything’s fine. The next, you’ve got a technician telling you there’s a problem underground and you need to make a decision.

The good news is that a broken sewer line doesn’t always mean full replacement. Sometimes a targeted repair is the right call. Sometimes it’s not. Knowing how to tell the difference and what the tradeoffs actually are helps you make a smart decision instead of a panicked one.

Here’s how to think through it.

Diagnosing a Broken Sewer Line

Before you can decide what to do, you need to know what’s actually going on. Sewer lines can fail in a lot of different ways, and the best fix depends on the specific problem.

Common Symptoms

You may already have noticed one or more of these:

• Recurring backups or slow drains across multiple fixtures, especially the lowest ones in your home
• Sewage smell in the basement, near a floor drain, or over the path of the sewer line in your yard
• Water in the basement that appears without a clear source, especially during or after heavy rain
• Gurgling toilets or drains when other fixtures are used
• Soft spots, sinkholes, or unusually green patches of grass along the path of your sewer line
• Foundation cracks or shifting in serious cases where a leak has been undermining the soil for a long time

Any of these on their own can have other causes. Together, they often point to a compromised sewer line.

Getting a Real Diagnosis

Symptoms tell you something is wrong. They don’t tell you what, where, or how bad. For that, you need a camera inspection.

During a camera inspection, a sewer camera is fed through the line from a cleanout, transmitting live video that shows exactly what’s happening inside the pipe. A good technician will walk you through what they’re seeing and give you a clear picture of:

• The material of your pipe (clay, cast iron, PVC)
• The type of damage (crack, root intrusion, belly, offset joint, collapse, corrosion)
• The location of the damage (near the foundation, midway across the yard, near the city connection)
• The extent of the damage (a single spot, multiple spots, or systemic failure across the whole line)

Those four pieces of information drive the entire repair vs. replace decision. 

Types of Broken Sewer Line Repairs

There are several ways to fix a broken sewer line, ranging from targeted spot repairs to full replacement. Understanding the options helps you evaluate what you’re being quoted.

Spot repair (traditional): A single damaged section of pipe is dug up and replaced. This works well when the damage is limited to one specific area and the rest of the line is in good shape. Requires excavation only in that one spot.

Pipe lining (trenchless): A resin-coated liner is inserted into the existing pipe and cured in place, creating a new pipe within the old one. Works for cracks, small breaks, and root damage across longer sections, without digging up your yard. Not an option for fully collapsed lines.

Full replacement (traditional): The old line is dug up and replaced from the house to the connection point. The most invasive option, but sometimes the only one that makes sense.

The best option for your situation depends on what the camera inspection reveals about your specific line.

How to Decide: Repair or Replace?

Once you know whether you’re dealing with traditional sewer repair or replacement or trenchless, the decision usually comes down to a handful of factors.

Consider Repair When…

• The damage is isolated. A single crack, a specific root intrusion point, or one bellied section can often be handled with a spot repair. If the camera shows the rest of the line is in good shape, there’s no reason to replace it all.
• The pipe is otherwise in good condition. Newer PVC or well-maintained cast iron with a single problem area is a strong candidate for repair. The material has plenty of life left.
• The problem are is hard to access. If the damaged section is under a driveway, in the middle of a mature garden, or requires tearing up finished landscaping, a trenchless repair option may make a targeted fix even more attractive.
• Budget is a serious constraint. Repairs cost less than replacements, sometimes significantly less. If the rest of the line is sound, a repair can buy you a lot of time.

Consider Replacement When…

• The damage is widespread. If the camera shows multiple cracks, roots at several joints, or ongoing corrosion throughout the line, you’re going to be back for another repair soon. At that point, replacement is often more cost-effective in the long run.
• The pipe material is at the end of its life. Clay pipes in Chicago are commonly 60 to 100 years old. Cast iron corrodes from the inside out and eventually thins to the point of failure. If your line is old and failing in one place, it’s likely to keep failing.
• The line has significant structural issues. A collapsed section, major bellies, or offset joints across the length of the line generally can’t be repaired piecemeal. Replacement gets you a fresh start.
• You’re planning to stay in the home long-term. A new sewer line lasts 50 to 100+ years depending on material. If you’re staying put, replacement is a one-time investment rather than a series of repairs.
• You’re finishing the basement or doing major landscaping. If you’re about to invest in improvements above the sewer line, replacing it first protects that investment. Nothing worse than tearing up a new patio or risking damage to a newly finished basement to fix a sewer line.

What to Ask Before You Decide

Before signing off on either option, ask your technician:

• Can I see the camera footage of the damage?
• What’s the pipe material?
• Is the damage isolated or systemic?
• What’s the expected lifespan of the repair vs. the replacement?
• What are all my options (trenchless included), and what’s the cost of each?
• What’s the timeline for the work?

A good sewer contractor will walk you through this without pressure. If someone’s pushing full replacement without showing you what’s actually in the line, that’s a red flag.

Get a Second Opinion If You’re Unsure

Sewer line work isn’t cheap either way, and the right answer isn’t always obvious. If you’ve been quoted a full replacement and you’re not sure whether a repair might work, or you’ve been quoted a repair and you’re worried it’s a band-aid, a second opinion can save you real money in either direction.

Madden Sewer & Drain has been repairing and replacing sewer lines for Chicago homeowners for over 60 years. We’re family-owned, licensed, and bonded, with a 4.9-star rating across 300+ Google reviews. We’ll show you what’s in your line, explain your options, and give you our recommendation based on what we see.

Our team has decades of experience solving these issues and we’d love to help you make the right call for your home.

Call 773-588-7534 for a free estimate.