Homeowners are usually responsible for the sewer line that runs from their house to the public sewer main or septic system, including cleaning, inspections, and repairs. Municipalities or utilities typically maintain the main sewer line in the street or easement and are not responsible for private lateral lines. Responsibility can differ by city or homeowners’ association rules, so it helps to check local codes or your HOA documents. If a problem is in the public main, the city may handle that portion while you still pay for your private section.