Where does the main water service enter the building?

The main water service typically enters a building through the floor, which is a common practice in plumbing design. This approach allows the water supply line to connect directly to the plumbing system at a point that efficiently distributes water throughout the building. It can often be seen entering near the basement or on the ground floor level, where the water supply line connects to the building's internal plumbing network.

In contrast, entering through the roof or a window is not practical for water service lines, as these methods could pose issues related to accessibility, maintenance, and structural integrity. Additionally, while water lines can theoretically enter through a wall, this is less common than through the floor, especially in typical residential and commercial buildings where grade-level access is more effective and manageable.