Storm building sewers 10 inches or less in diameter require cleanouts not more than how far apart?

• A. 200 feet
• B. 400 feet
• C. 600 feet
• D. 800 feet

Answer: (B)

Access for cleaning and inspection is essential, so codes set a limit on how far a cleanout can be from any point along a small-diameter storm sewer. For storm building sewers that are 10 inches in diameter or smaller, no segment should be more than 400 feet long before a cleanout is provided. This spacing keeps blockages within reach of typical cleaning methods and ensures maintenance personnel can access the line without excessive effort or distance. Cleanouts are placed at the ends of runs and at intervals along straight sections and at changes in direction, so every portion of the pipe remains serviceable.