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

A sump pump is specifically designed to remove accumulated water from areas prone to flooding, such as basements and shallow excavations. Its primary function is to prevent water from accumulating to levels that could lead to damage or flooding. This is particularly important in regions where groundwater levels fluctuate or during heavy rainfall, ensuring that the space remains dry and safe.

The other options relate to functions that are not associated with a sump pump. Regulating water pressure, for example, is usually handled by pressure regulators or valves, while heating water for residential use is the job of water heaters. Filtering water is the role of filtration systems that typically operate at different points in a plumbing system, not a sump pump. Thus, the choice that accurately reflects the purpose of a sump pump is the one focused on water removal to safeguard against flooding.