The answer to 'what is water line' is a water line, also known as a service line, is the pipe that carries fresh water from the main water supply into a home or building. This underground pipe connects the public water system to the internal plumbing of a property, providing a continuous supply of clean water for drinking, bathing, cooking, and other household uses.
Water lines are typically made of materials like copper, galvanized steel, or plastic (PVC or polyethylene). The size and depth of the water line can vary depending on the location, water pressure requirements, and local building codes. Homeowners are responsible for maintaining the water line from the property line or curb stop to the home, while the municipality or water utility company is usually responsible for the portion of the line from the main water supply to the property line.