Who Is Responsible for the Sewer Lateral?
The sewer lateral — the pipe from your house to the main — is generally the homeowner's responsibility. Here is what that means.
In the Knoxville area, the sewer lateral — the pipe that carries wastewater from your house to the sewer main in the street — is generally owned and maintained by the homeowner. The utility (commonly KUB) owns and maintains the sewer main. This means that if the lateral is clogged, cracked, or collapsed, the repair is typically the homeowner's responsibility. If the problem is in the main — affecting multiple homes — the utility is generally responsible. Always verify the exact responsibility boundary with your utility provider.
Why This Matters
Sewer lateral repairs can be significant — they often involve excavation, and the cost depends on the depth, length, and location of the pipe. Knowing that the lateral is your responsibility helps you plan ahead, maintain the line proactively (with periodic camera inspections), and act quickly when a problem appears. Ignoring a slow drain or recurring clog can lead to a backup that causes sewage damage inside your home.
How It Generally Works in the Knoxville Area
The sewer system has two main parts: The sewer main: The large pipe in the street or easement that carries wastewater from multiple homes to the treatment plant. This is owned and maintained by the utility (KUB in most of Knoxville). If the main is blocked or damaged, the utility handles the repair. The sewer lateral: The pipe that runs from your house to the sewer main. This is typically owned and maintained by the homeowner. If the lateral is clogged, cracked, or collapsed, the repair is generally your responsibility. How to tell the difference: If only your home is experiencing slow drains or backups, the problem is likely in your lateral. If multiple homes on the street are affected, the main may be the issue — contact KUB. Common lateral problems in Knoxville: Tree root intrusion (especially in older neighborhoods with clay pipe), pipe collapse, offset joints, and grease buildup. A sewer camera inspection can identify the exact problem and location before any excavation begins.
What the Homeowner Can Check
- Whether only your home is affected (lateral) or multiple homes are affected (main)
- Whether the problem is recurring (which may indicate root intrusion or pipe damage rather than a simple clog)
- Whether you have had a sewer camera inspection to identify the cause
- Whether the lateral passes under a driveway, sidewalk, or other structure (which affects repair options)
Who to Contact
A Licensed Plumber
For lateral issues — clogs, cracks, root intrusion, or collapse. A plumber can camera-inspect, clear, and repair the lateral.
Learn moreKUB (Knoxville Utilities Board)
If multiple homes are backing up, the sewer main may be the issue. Contact KUB.
Visit siteTennessee 811
Before any excavation to repair a lateral, call 811 to have underground utilities marked.
Visit siteWhat Not to Do
- Do not pour chemical drain cleaners into a recurring clog — they can damage pipes and do not fix root intrusion or structural damage
- Do not ignore recurring backups — they may indicate a structural problem that will worsen over time
- Do not excavate to repair a lateral without calling 811 first
Still not sure who is responsible or what to do next?
Ask our AI Plumber — describe the problem and get guidance on whether it is likely on your side or the utility side.
Ask the AI PlumberVerify current requirements directly with the applicable authority.
Requirements may differ depending on whether the property is inside the City of Knoxville, elsewhere in Knox County, or served by another utility. Homeowners should verify current requirements with the applicable permitting authority before beginning work.
Common Questions
Will KUB clear a clog in my sewer lateral?
Generally, no. The lateral is the homeowner's responsibility. KUB is responsible for the main. If you are unsure whether the clog is in the lateral or the main, a plumber can camera-inspect to determine the location.
How much does it cost to repair a sewer lateral?
Costs vary widely depending on the depth, length, location, and repair method (spot repair vs. full replacement). See our Cost Guide for general Knoxville-area pricing ranges, and contact us for a specific assessment.
Can tree roots really break a sewer pipe?
Yes. Tree roots seek moisture and can enter sewer pipes through small cracks or joints. Over time, they grow and can block or break the pipe. This is common in older Knoxville neighborhoods with clay sewer pipes. A camera inspection can identify root intrusion before it causes a backup.
If the problem involves your home's plumbing, The Classic Plumber can help.
We diagnose before we recommend — and we tell you when the issue is on the utility's side.