What is the function of a sump pump in a plumbing system?

A sump pump serves a crucial role in managing groundwater levels and preventing flooding in areas such as basements or crawl spaces. Its primary function is to remove accumulated water that has collected below ground level, typically in a sump pit. This is especially important in areas prone to flooding or where water naturally seeps into the building's foundation. By efficiently pumping this water out and away from the building, a sump pump helps protect structures from water damage, mold growth, and other related issues.

The other options pertain to functions that are not associated with a sump pump. For example, circulating hot water is typically managed by a hot water recirculation system, while filtering contaminants is the role of water treatment systems. Meanwhile, regulating pressure in the plumbing system is generally handled by pressure regulators or relief valves. Each of these tasks is distinct and not part of what a sump pump is designed to do.