Distinguish between a hydrant and a standpipe in terms of typical location and use.

• A. Hydrants are external water sources accessible outside the building; standpipes are internal piping with outlets used by firefighters inside the building.
• B. Hydrants are indoor outlets for occupant use; standpipes are external water mains.
• C. Hydrants are only for municipal use; standpipes are portable hoses.
• D. Hydrants supply potable water; standpipes supply non-potable water.

Answer: (A)

Hydrants and standpipes differ in where the water source is located and how firefighters use them. Hydrants are external water sources connected to the municipal main, located outside the building or at the property line, and they’re used by firefighters to get water from outside or to feed attack lines when access outside is practical. Standpipes are part of the building’s internal piping, with outlets located inside the structure (on various floors) that firefighters connect to for interior firefighting work. This internal system lets crews reach fires inside the building without relying solely on outdoor water sources. The other options misstate location or use—for example, indoor outlets for occupants aren’t hydrants, and standpipes aren’t external mains, nor are hydrants simply potable-water sources or portable hoses.