What Is a Sewer Lateral?
A sewer lateral is the privately owned pipe that carries wastewater from a building to the public sewer main, usually located under the street. In most jurisdictions the property owner is responsible for the entire lateral including the portion beneath public land, which makes a failure there an unexpectedly expensive discovery.
The materials and their failure modes
What a lateral is made of largely predicts how and when it fails.
- Vitrified clay: common pre-1970, typically lasts 50 to 60 years, fails at joints where roots enter
- Cast iron: durable but corrodes internally over decades, narrowing and eventually perforating
- Orangeburg: bituminized fibre conduit used roughly 1945 to 1972, deforms and collapses, typically failing at 30 to 50 years and considered a known problem material
- PVC and ABS: modern standard, expected to last a century or more with proper installation
Ownership varies more than people expect
The default in most US jurisdictions is that the owner is responsible all the way to the main. Some cities take responsibility past the property line, and a few maintain the entire lateral. The difference can be several thousand dollars on a single repair.
It is worth establishing before commissioning work rather than after, and a call to the municipal wastewater department answers it definitively.
Frequently asked questions
How do I know what my lateral is made of?
A camera inspection identifies it definitively, and the home's construction era is a strong indicator. Pre-1970 usually means clay or cast iron; roughly 1945 to 1972 raises the possibility of Orangeburg, which is worth ruling out because it fails predictably and cannot be reliably repaired.
Is the lateral covered by homeowners insurance?
Standard policies generally exclude it as maintenance. Some carriers offer a service line endorsement covering buried utility lines, which is inexpensive and worth having. Many municipalities and utilities also offer optional service line protection plans.
See also
Related services
- Sewer Line Repair and ReplacementRepair, lining, or replacement of damaged sewer laterals, including trenchless options that avoid excavating the yard.
- Emergency Sewer Backup ServiceEmergency clearing of blocked sewer lines and main line backups, including camera inspection to identify the underlying cause.
- Emergency Drain CleaningClearing of blocked sinks, tubs, showers, and toilets, including cable work and hydro jetting for stubborn or recurring blockages.