What term describes the area where a water supply line connects to a building's plumbing?

The term that accurately describes the area where a water supply line connects to a building's plumbing is the water service entrance. This is the point at which the municipal water supply, often delivered via a water main, enters the property and is connected to the internal plumbing system of the building.

The water service entrance typically includes components such as the main shut-off valve, which allows for the isolation of the water supply when necessary. It is crucial for ensuring that the building has a regulated and reliable source of water for various uses.

Understanding this distinction is essential for plumbing design and installation, as it impacts the overall function and maintenance of the plumbing system within a building. Other terms, like water meter, water supply junction, and water main, refer to different components or concepts within the water supply infrastructure, but they do not specifically denote the point of connection for the water supply line to the building's plumbing.