Sewer line problems: backups, camera inspections and when replacement is really needed

Updated November 10, 2026 · KeystoneProGuide editorial team

What counts as a sewer line problem?

Trouble in the private pipe that takes a house's wastewater out to the street, which Philadelphia's permit and loan rules call the house drain and the sewer lateral, or out to a septic tank. A diagnosis that the pipe must be dug up is the moment to slow down, because the repair can run to thousands of dollars and the need for it can be hard to judge from the surface.

Who is responsible for the sewer line?

Usually you, at least for the private section. In Philadelphia, the Water Department's Homeowner Emergency Loan Program exists for owners whose leaking water line or sewer lateral has drawn a Notice of Defect from its inspectors, and the city says owners are responsible for pipes outside the building as well as inside. It issues a Notice of Plumbing Defect when a plumbing connection serving a property threatens water quality, public health or safety. The city maintains its own sewers and mains. A private water or sewer service in the city is filed under a Site Work and Utility Permit, and work on the house drain or a lateral is permitted plumbing work.

Outside Philadelphia, ask your sewer authority or municipality where its responsibility ends before you hire anyone for work near the street.

What should a camera inspection show you?

The actual problem, on screen. This Old House says most sewer projects begin with a camera inspection to locate blockages, cracks or collapsed sections and decide the repair. Ask to watch it, or to be given the recording, and ask the plumber to point out the defect and where it is.

The reason to insist comes from a Pennsylvania case. In October 2026, the Attorney General announced a settlement resolving allegations that a plumbing company and two former technicians misled consumers into unnecessary sewer pipe replacements. The lawsuit alleged that customers with backups were told their lines could not be cleared with a snake, only by excavation, and that many were told of pipe defects that did not exist. The office notes a settlement is not an admission.

The settlement's terms make a good standard for anyone. The company must document the defects behind a recommended replacement, and they must meet a level of severity under the defect standards of the National Association of Sewer Service Companies; technicians who sell excavation or hydro jetting must hold that association's lateral assessment certification; and if a line will not open, they must try several times with a snake and tell the customer about getting a second opinion.

Can the line be cleared instead of replaced?

The settlement requires the company involved to try repeatedly with a snake before selling excavation. Clearing is also much cheaper: HomeAdvisor gives $190 to $570 for sewer line cleaning, against thousands for replacement.

What do repairs and replacements cost?

The national surveys give these figures:

Angi also prices a cured-in-place liner at $80 to $250 a foot and pipe bursting at $60 to $200, and puts cleanup after sewage damage at $500 to $10,000. This Old House says permits can add $100 to $1,000 depending on the location. Pennsylvania's construction code treats adding to or relocating sewer or drainage piping as more than an ordinary repair, so expect a permit for most replacements; an emergency repair may go first if the application follows within 3 business days.

What if water backs up into the basement in heavy rain?

Philadelphia treats that as a separate problem, with its own program. Its Basement Backup Protection Program offers free backwater valve installation, and free downspout changes if needed, for homes where water backs up through basement fixtures in wet weather. A backwater valve lets wastewater out but closes to stop it coming back. The pipe to the sewer must be in good condition first; if it is broken, the city says you can fix it through its zero-interest loan or with your own plumber. While a backup is happening, call (215) 685-4901 and take video if you can.

The city also runs a Cross Connection Abatement Program, which replaces sanitary drain lines found to be connected to the storm sewer.

What if the house is on a septic system?

Then a backup can be the system, not the pipe. Penn State Extension says a failing septic system can back wastewater up into the home. The EPA says household tanks are typically pumped every three to five years, and that the average system should be inspected at least every three years.

How do you avoid paying for the wrong repair?

• Ask for the camera footage and the location of the defect.
• Ask whether the line was cleared and whether it drains now.
• Get a second camera inspection before agreeing to excavation.
• Get the price, the method and the length of pipe in writing, and the three-day cancellation notice the state requires on home improvement contracts.

Plumbing scams to avoid describes the pattern in more detail, the Philadelphia guide covers the city's loan and permits, and plumbers who do sewer work are on the plumbers directory page.

Sources

1. AG Sunday Obtains Settlement Requiring Home Improvement Group to Pay Consumer Restitution and Undergo Robust Technician Certification Programs, Pennsylvania Office of Attorney General
2. How Much Does Sewer Line Replacement Cost? (2026 Pricing), This Old House
3. Sewer Line Replacement or Repair Costs, Angi
4. How Much Does a Plumber Cost in 2026?, HomeAdvisor
5. Get a Plumbing Permit, City of Philadelphia
6. Financial Assistance, Philadelphia Water Department
7. Basement Backup Protection Program, City of Philadelphia
8. Follow these tips to get ready for pipe repairs, City of Philadelphia, Department of Revenue
9. On-Lot Septic System Inspections During Real Estate Transactions, Penn State Extension
10. How to Care for Your Septic System, U.S. Environmental Protection Agency
11. 34 Pa. Code § 403.62. Permit requirements and exemptions., Commonwealth of Pennsylvania (Pennsylvania Code)