What is a building's water service line?

The water service line is defined as the pipe that delivers potable water from the public water supply or a private source directly to a building's plumbing system. This line typically connects to the municipal water main or a private well and is responsible for supplying water to faucets, fixtures, and appliances within the building. It is crucial for maintaining an adequate water supply for various needs, such as drinking, cooking, cleaning, and other domestic uses.

Understanding the purpose of the water service line helps differentiate it from other types of plumbing components. For instance, the main sewage line is responsible for carrying wastewater away from the building, while irrigation lines serve entirely different functions related to landscape watering. Similarly, drainage pipes are designed to remove excess water or waste from a location, rather than delivering it. Thus, recognizing the specific role of the water service line highlights its importance in a building's plumbing infrastructure and ensures clarity in plumbing code practices.