How Sewer Laterals Connect Your Home to the Sewer

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Understanding Sewer Collection Systems: Who’s Responsible for What?

Sewer backups are more than just an inconvenience—they can cause extensive damage to homes and create serious health hazards. Unfortunately, when these incidents occur, many homeowners are left wondering who is responsible for fixing the problem. Cities and municipalities often deny liability, shifting the burden onto homeowners, even when the law says otherwise.

In Oklahoma, the legal responsibility for sewer lines is divided between homeowners and the City. However, there is often confusion—sometimes intentional—about where the City’s responsibility begins and ends. Let’s break down how a sewer collection system works and clarify who is responsible for what.

How a Sewer Collection System Works:

A sewer collection system is designed to carry wastewater from homes and businesses to a treatment facility. The system consists of several key components:

  • Lateral Line (Private Side): This is the pipe that connects a home’s plumbing to the City’s sewer system. It runs from the house to the edge of the homeowner’s property and continues to where it connects with the City’s infrastructure.
  • Lateral Line (Public Side): Once the lateral line crosses into the public right-of-way—whether that’s an easement, alley, or under the street—it becomes the City’s responsibility.
  • Main Sewer Line: This is the large pipe that collects wastewater from multiple homes and businesses and transports it to the City’s treatment facility. The City is fully responsible for maintaining and repairing the main line.

Homeowner vs. City Responsibility

Despite what the City may claim when denying a sewer backup or damage claim, Oklahoma law is clear:

  • Homeowners are responsible for the lateral line on their property. This means that if a blockage or break occurs in the portion of the lateral that is within the homeowner’s yard, driveway, or under their house, the homeowner must pay for repairs.
  • The City is responsible for the lateral line in the easement or under the street. Once the lateral extends beyond private property into a public right-of-way, the City must maintain and repair it. This also means that if a blockage occurs in this section, the City—not the homeowner—is responsible.
  • The City is responsible for the main collection line. Any damage or blockage in the main sewer line falls squarely on the City.

Why This Matters:

Many homeowners assume that if sewage backs up into their home, the City will take care of the problem. Unfortunately, Cities frequently deny responsibility, even when the issue is in the portion of the lateral they are legally required to maintain. This can leave homeowners fighting an uphill battle to get their damages covered.

If you experience a sewer backup, it’s important to investigate the cause. A professional plumber can use a camera inspection to determine whether the issue is in your private lateral or the public section. If the blockage is in the City’s portion, you may have legal grounds to seek compensation for damages.

At Oklahoma Sewer Lawyers we help homeowners hold Cities accountable when they neglect their responsibilities. If you’ve experienced a sewer backup and believe the City is at fault, contact us to discuss your legal options.