What is the primary purpose of a standpipe system in a building?

• A. Provides water for firefighting inside a structure
• B. Provides drinking water
• C. Provides irrigation
• D. Provides sewer venting

Answer: (A)

Standpipe systems exist to supply water for interior firefighting. They bring a ready water source to different levels of a building so firefighters can connect hoses close to the fire and attack from within, reducing reliance on distant street hydrants and long lay-flat runs. In a wet standpipe, the pipes are already filled with water; in a dry standpipe, water is introduced and pressurized as needed. This distinction affects how quickly water is available to crews. The other listed uses—drinking water, irrigation, or sewer venting—are provided by those other building systems, not for firefighting inside.