What encompasses all components dealing with water supply, drainage, and venting within a building?

The plumbing system is the comprehensive term that includes all the components involved in the management of water within a building, which comprises water supply lines, drainage systems, and venting mechanisms. This system is critical to ensuring that water is delivered efficiently and safely to various fixtures throughout the building while also managing wastewater appropriately.

A water heater, while essential for providing hot water, is just one element of the larger plumbing system and does not encompass drainage or venting. A private sewer refers specifically to the segment of the system that handles wastewater disposal, but it does not cover the entire water supply and venting components. Lastly, a public utility is an entity that provides services such as water supply to the public but does not define the internal workings and components of plumbing within a building. Therefore, the plumbing system is the most accurate term that captures the entirety of these functions within a structure.