The answer to 'how does sewer line work' is that a sewer line is the main pipe that carries wastewater from your home to the municipal sewer system or a septic tank. The sewer line runs underground from your home's plumbing system to the street or septic tank, carrying all the waste and water from sinks, toilets, showers, and other fixtures. It relies on gravity to move the wastewater, with the line sloping downward to allow the waste to flow away from your home.
Sewer lines are typically made of cast iron, PVC, or other durable materials designed to withstand the corrosive nature of wastewater. They can run for dozens or even hundreds of feet, connecting your home to the larger sewer infrastructure. Regular maintenance, like cleaning and inspections, helps ensure your sewer line continues to function properly and prevents clogs or backups.