Sewer Line Repair and Replacement Costs: What Homeowners Should Expect

Are you noticing a gurgling noise or smelling an unpleasant odor when you’re in the bathroom — neither of which is coming from you? You may have a leaking sewer line, and — unlike the toilet where this whole mess began — this isn’t something you’re gonna wanna sit on!

Oh, and, not to dump too much on you at once, but the price for repairing or replacing the buried line that gets rid of the stuff you flush down the drain is, ironically, going up.

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Your sanitary sewer line, or septic sewer line, is distinct (or, should we say, di-stinked?) from your water service line, which carries fresh water into your house, and storm sewer, which channels rainwater away from your house. The underground pipes of your sanitary sewer system carry sewage from bathrooms, sinks, kitchens and other plumbing components to a wastewater treatment plant where it is filtered, treated and discharged. Alternatively, if you have a septic system, your sewage pipes carry wastewater to an underground tank, where contaminants are quarantined from groundwater to prevent pollution as the system breaks down the materials through naturally biological processes, then releases the treated water back to the soil on site.

Experts say homeowners should have their sewer pipes serviced as often as every two years to keep them free of clogs and potential backups from debris buildup over time. But even if you do keep your line well-maintained, ruptures can result from issues such as:

• Ground shifting

• Pipe separations

• Cracks

• Root infiltrations

Because the line is buried several feet underneath your yard, it’s not always immediately evident that something’s wrong. Some telltale signs that your sewer pipes have problems can include:

• That aforementioned gurgling toilet and accompanying stench

• Slow draining

• Puddles of sewer water in your yard

• And even a patch of grass that’s suspiciously robust and green due to having been … gulp, fertilized.

Once you’ve identified a potential sewer-line leak, note that this isn’t the type of thing the average homeowner can DIY their way out of — you need to call in the pros post-haste for this gross waste. It’s going to require expertise and, likely, excavation, and your homeowner’s insurance may not cover the repair. You’ll want to have at least an idea of how much a repair job is likely to cost you before you start making panicked calls to sewer contractors as your lawn starts to resemble The Bog of Eternal Stench.

Project costs differ wildly depending on a number of variables, which could include:

• Whether your pipes are PVC, concrete, cast iron, clay or something else

• The method of inspection used

• Whether the pipe must be replaced or simply patched

• Whether excavation work is required

• Whether landscaping, a sidewalk or driveway must be torn up

• Pipe depth

• Whether tree roots must be removed

• The type and state of the soil

• The region and terrain

• Whether additional cleanup work is required

If the damage to your sewer line is minor, you may get by with a trenchless repair, which involves breaking the pipe, removing it and sliding a new one into place. This can also be done by installing and inflating a new lining within the existing pipe. Your contractor may perform a sewer camera inspection to help determine the scope of work needed.

If you do need digging, regions of the U.S. where weather stays warmer year-round — such as the Southwest and along the sunbelt states — catch a bit of a price break, as their pipes are buried an average of just 3 feet deep. Due to the frigid winters of the Midwest and Northeast, however, homes in those and other cold-weather climates have pipes buried as deep as 8 feet — and deeper ain’t cheaper when it comes to pipe excavation.

But just scheduling a repair is easier said than done, of course, and repairs can be pricey. Average sewer and septic line repair and replacement costs have increased over the past five years by more than 30% in some cases, according to aggregated HomeServe data as reported by our nationwide network of contractors. Meanwhile, as many as 41% of homeowners have less than $500 saved for a home repair emergency.

A look at national average repair prices might help ease the sticker shock by giving you an idea of what that bill for sewer-line work might look like.

Unblock Sewer Line: $295

Locating and removing blockage from a clogged sewer line carries a national average cost of $295. That price is 10% higher than in 2022, when it cost $268, and 20% higher than in 2020, when it cost $246.

Sewer Line Repair: $1,581

To replace a collapsed section of sewer line piping, you can expect to pay somewhere around the national average cost of $1,581. Prices have increased nearly 10% since 2022, when it cost $1,438, and over 20% since 2020, when it cost $1,315.

Sewer Line Replacement: $6,633

To replace the sewer line entirely — from 25 feet up to 75 feet of pipe — you can expect to pay somewhere around the national average cost of $6,633. Prices have increased 15% since 2022, when it cost $5,754, and over 31% since 2020, when it cost $5,054.

Diagnostic Fee

Something to keep in mind is that plumbers (like many other types of service professionals) often charge a “callout” fee. Also referred to as a “diagnostic” fee, this is essentially how much it’s going to cost to get a plumber to drive to your home and look at your system. Even if they don’t find anything wrong, they will likely bill for this time.

(The prices above reflect repair costs as of December 2024, and are based on national data. Costs in your community could be higher or lower, depending on a number of factors. This pricing does not necessarily reflect emergency repairs, which can often cost more due to services needed on short notice or after hours.)