Which of the following is NOT a component of the sanitary sewer system?

• A. Private building lateral sewer
• B. Mainline sewer
• C. Force mains
• D. None of the above

Answer: (D)

Understanding what makes up a sanitary sewer system is essential. The system includes the pipes that move wastewater from buildings to treatment facilities. The private building lateral sewer is the line from a building to the public sewer; it’s a fundamental piece of the network. The mainline sewer is the large trunk that carries sewage along the system toward treatment. Force mains are pumped, pressurized pipes used where gravity alone can’t move the wastewater, often connected to lift stations. Since all of these elements are standard parts of a sanitary sewer system, there isn’t an item listed that falls outside the system. Therefore, none of the above is the correct choice.