Buying a house in Philadelphia? Check the sewer line first

Why the sewer line matters when you buy

In Philadelphia the owner is responsible for the house drain, curb trap and lateral all the way to the sewer main in the street, including the parts under the sidewalk and roadway. Once you settle, an old or broken lateral is your problem, and the repair can be expensive. Costadia’s June 2026 estimate for a Philadelphia sewer line replacement is $3,550–$13,400, with most around $8,500, and PlumbingPriceGuide lists full excavation at $4,600–$28,750+ depending on depth and access. A camera inspection before you buy costs far less.

A standard home inspection may not look inside the lateral

Home inspectors follow a standard of practice. The American Society of Home Inspectors (ASHI) standard has inspectors look at the visible and accessible interior drain, waste and vent piping and the functional flow of fixtures. It says they are not required to inspect underground items or septic and other sewage disposal systems. A buried lateral under the sidewalk is neither visible nor accessible.

So ask your inspector directly whether a sewer scope (a camera inspection of the main drain and lateral) is included. If it isn’t, add one, from the inspector or from a licensed plumber. PlumbingPriceGuide lists Philadelphia camera inspections at $125–$500 (March 2026), and Costadia lists $100–$500 (June 2026). What a camera inspection shows.

A scope is especially worth it when:

• The house is old enough to have clay, cast iron or Orangeburg pipe. See what your lateral is made of.
• The house was flipped or gut-renovated. New finishes say nothing about the old lateral under the floor.
• There is a large street tree out front, or the seller mentions roots or regular rodding
• The basement floor drain shows staining, or the basement has been freshly finished or painted
• The house sits on a court or alley, where a shared line is possible

Ask for the video and the distance to each defect, so a plumber can price a repair from it.

What to ask the seller

Pennsylvania’s Real Estate Seller Disclosure Law requires the property disclosure statement to cover “water and sewage systems or service” and the “plumbing system,” among other subjects (68 Pa.C.S. § 7304). The seller must not fail to disclose a known material defect. But the law also says the seller “is not obligated by this chapter to make any specific investigation or inquiry” (§ 7308). A clean disclosure means the seller isn’t aware of a problem. It doesn’t mean anyone has looked inside the pipe.

Questions worth asking in writing, through your agent:

• Has PWD ever issued a Notice of Defect for this property? Was it repaired, and by whom?
• Is there an outstanding HELP loan? HELP repairs are repaid on the water bill and secured by a lien on the property, so ask your title company or settlement agent to confirm how any water-related lien will be handled at settlement.
• Has the house had sewage backups, in dry weather or in rain? How often is the line rodded, and has anyone found roots?
• Has the lateral or curb trap ever been replaced or lined? Is there a camera video or invoice?
• Does the house connect directly to a public sewer, or through a shared or private line? PWD’s Customer Guide specifically tells buyers to confirm this, because owners connected to a private sewer share responsibility for repairing it.
• Is there a backwater valve, and was it installed through PWD’s Basement Backup Protection Program?

What you can check yourself

• Past permits. L&I permits can be searched in eCLIPSE, the City’s licensing and permit system, without logging in. A plumbing permit for sewer work suggests the lateral was repaired. No permits on a gut rehab is worth asking about.
• The plumber who did past work. If the seller names a contractor, look the license up in L&I’s contractor lookup.
• The front of the house. A sunken sidewalk square, a patched trench in the pavement, or a missing vent cover near the front wall are all reasons to ask questions.

If the scope finds a problem

Get a written repair quote from a licensed plumber while your inspection contingency is still open, so you and your agent know what you are negotiating over. Typical outcomes are a price reduction or credit, a seller repair with permits and a final camera video, or walking away; which one makes sense is a question for your agent or real estate attorney. Keep in mind:

• Sewer lateral work needs a PWD Sewer Connection Permit and an L&I Plumbing Permit, and a licensed plumber must do it. If the seller repairs it, ask for the permit numbers and the post-repair video.
• PWD’s HELP loan is for property owners, generally after a Notice of Defect, so it is not something a buyer can use before settlement. Who qualifies.

We can connect you with an independent, licensed Philadelphia plumber to scope the line or price a repair. Request a quote

After settlement

PWD’s Customer Guide says new owners become the water customer of record by sending the first page of the settlement sheet to the Water Revenue Bureau (many title companies do this for you). Keep the sewer scope video with your house papers. If problems show up later, here is who to call.

We are a free referral service, not a plumber. We connect you with an independent, licensed Philadelphia plumber who quotes and does the work. Disclosure

Related

• When to call a sewer repair company in Philadelphia
• Common sewer line problems in older Philadelphia homes
• Sewer camera inspection
• Sewer line repair cost in Philadelphia
• PWD Notice of Defect & the zero-interest HELP loan