A main water sewer line is the central underground pipe that carries all wastewater from your home to the city sewer main (or septic tank). It collects from every drain, toilet, and fixture and discharges through a single line running under your yard to the public connection point.

How it works

  • Receives drainage from every fixture in the home
  • Runs underground to the city main or septic system
  • Typically 4-inch pipe, sloped for gravity flow
  • Has a cleanout for access by plumbers
  • Is the homeowner’s responsibility from house to the city connection

See our sewer services for repair, replacement, and trenchless options.