Standard residential underground sewer lines are engineered to last for decades, with cast iron pipes typically lasting 50 to 75 years and modern PVC sewer lines lasting 100 years or more. However, clay or Orangeburg pipes often require replacement after 30 to 50 years due to root infiltration, soil shifting, or structural collapse. Routine professional sewer scope inspections every few years help monitor pipe integrity. Verification: Schedule a professional video camera inspection of your main sewer line to evaluate its current structural condition.
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