Sewer line repair, before you dig up the lawn

What is sewer line repair?

Sewer line repair fixes the buried lateral that carries waste from your house to the municipal main or your septic tank. The work starts with a camera inspection - nobody can price the job without seeing inside the pipe - and then splits three ways: pipe lining (a resin sleeve cured inside the old pipe), pipe bursting (a new pipe pulled through, shattering the old one), or open excavation. Most jobs run one to five days. The first thing worth establishing is which section of the line is legally yours.

Signs you need sewer line repair

• Several fixtures back up at once - a toilet, a tub and a floor drain all slow or gurgling together points at the main line, not at any one fixture. This is the single most diagnostic symptom on the list
• The lowest drain in the house - a basement floor drain, a ground-floor shower - backs up when you run the washing machine or flush upstairs
• Sewage smell in the yard, or a patch of grass that is suspiciously greener, lusher or perpetually soggy over the line run
• Repeated clogs that come back within weeks despite being cleared properly, especially in a house with mature trees
• Slow drains across the whole house that started gradually rather than overnight
• Sinkholes, dips or soft spots in the lawn or driveway along the path between the house and the street
• Rodents or drain flies appearing indoors - a cracked lateral is an entry point

Seeing something not on this list? Browse plumbing problems by symptom →

How sewer line repair actually works

1. 1

   Locate the cleanout and confirm it is the main line

   A plumber opens the main cleanout - usually outside near the foundation, sometimes in a basement or crawl space - to confirm the blockage or damage is in the lateral rather than in a branch inside the house. The difference is the difference between a $300 call and a five-figure one.

   Watch forA quote for line replacement produced without ever opening the cleanout. If nobody has established that the problem is in the lateral, nobody knows what they are selling you.

2. 2

   Camera inspection - the mandatory first step

   A self-levelling camera on a push rod runs the length of the line while a locator transmits its position to a wand above ground. You get pipe material, the type of failure (root intrusion, offset joint, belly, crack, collapse), and - critically - the distance from the cleanout in feet at which each problem sits.

   Watch forNo recording and no footage marks. You want the video file and the measured depths, because that footage is what a second opinion is priced from and what an insurer or a municipality will ask for. "We looked, trust us" is not an inspection.

3. 3

   Establish where your responsibility ends

   The lateral usually has two notional halves: the private portion on your property, and the portion running under the sidewalk, verge or street to the main. Which of those you own - and whether a repair in the right-of-way is on you or on the utility - is set by local ordinance and differs from city to city. Some municipalities own everything past the property line; some own nothing until the main; some run subsidised replacement or service-line protection programmes.

   Watch forA contractor who states confidently what "the rule" is without naming your jurisdiction. Call your city or county utility, or search your municipality plus "sewer lateral responsibility", before you authorise work in the right-of-way. Some of that work may require a municipal permit and an approved contractor regardless of who pays.

4. 4

   Choose the repair scope - spot repair or full run

   A single cracked joint at 22 feet does not require replacing 80 feet of pipe. Conversely, a clay line that shows root intrusion at six separate joints is telling you the joints are the failure mode and spot-fixing one buys you a year. The camera footage is what makes this an evidence-based decision instead of an argument.

   Watch forFull replacement recommended off a single defect, or spot repair recommended on a line the footage shows failing along its whole length. Ask the contractor to point at the footage and justify the scope.

5. 5

   Method selection - lining, bursting, or excavation

   Cured-in-place pipe lining pulls a resin-saturated liner through the existing pipe and cures it into a new pipe-within-a-pipe. Pipe bursting drags a splitting head through, fracturing the old pipe outward while pulling new HDPE behind it. Open excavation digs the line up. Lining needs a host pipe intact enough to line and loses a little internal diameter; bursting needs launch and receiving pits and clear ground around the run; excavation needs access and destroys whatever is above it.

   Watch forTrenchless marketed as always possible. It is not. A fully collapsed line, a severe belly (a sag holding standing water), or a run under a slab with no viable pit locations can all rule it out - and a belly is not corrected by lining, because the liner follows the sag. If a trenchless-only company says your line qualifies, get one traditional excavation contractor to look at the same footage.

6. 6

   Permits, locates and utility marking

   Sewer work is permitted work in most jurisdictions, and any digging requires underground utility locating first (811 in the US). Work in the public right-of-way typically needs a separate street-opening or encroachment permit, and often may only be performed by a contractor licensed and bonded with that municipality.

   Watch forA cash price offered to skip the permit. An unpermitted lateral replacement is a live disclosure problem when you sell, and if the municipality later fails it you pay twice.

7. 7

   The work itself

   Lining is typically a one to two day job with no full-length trench. Bursting needs pits at each end and usually runs one to two days. Open excavation depends entirely on depth, soil and what is on top - a line under a mature driveway is a different job from one under lawn. Water service is normally uninterrupted; drain use is not, so plan for the house being unusable for waste for part of the time.

   Watch forA timeline quoted without anyone having confirmed the depth of the line. Depth drives excavation cost more than length does, and it is on the camera locate.

8. 8

   Restoration, re-inspection and paperwork

   The line is re-camera'd after the work to prove the repair, the trench or pits are backfilled and compacted, and hard surfaces are restored. Compaction matters: badly backfilled trenches settle for years and take the new driveway with them.

   Watch forSurface restoration excluded from the quote. Concrete, asphalt, pavers, mature landscaping and irrigation lines are the commonest hidden line items on excavation jobs. Get restoration priced, or get its exclusion written down, before you sign. Also ask for the post-repair footage and the permit sign-off in writing.

What does sewer line repair cost?

Sewer line work spans an enormous range - from a low four-figure spot repair to well into five figures for a long, deep replacement under hard surfaces. Depth, length, method and what sits on top drive it more than anything else. Get the camera footage first; nobody can price this honestly without it.

See the full sewer line repair cost guide - by material, size and region →

If the number is the problem, here are the ways people pay for it →