What is a major risk if the water in a wet standpipe system is allowed to freeze?

In a wet standpipe system, water is constantly present within the pipes to provide immediate fire protection. If the water in this system is allowed to freeze, it can create a serious risk of system failure. The expansion of frozen water can lead to pipe ruptures, blockages, or other damage, resulting in an inability for the system to deliver water effectively when needed in an emergency. This failure can prevent firefighters from accessing the water supply necessary to combat a fire, which can endanger lives and increase property damage.

While a reduction in water pressure or an increased fire response time are concerns related to fire safety, they are direct consequences of a failure in the system. The correct answer highlights the critical importance of maintaining a functional wet standpipe system to ensure effective firefighting efforts are available when required.