A yard line or main water line carries fresh water from the water main in the street to your property. It is the primary source of water supply for a home or commercial building. The size and material of the main water line can vary depending on the size of the property, the water pressure requirements, and the location. The main water line is usually buried underground and is connected to your building’s plumbing system. It is important to ensure that the main water line is properly installed, maintained, and repaired to avoid any disruptions in the water supply or damage to the property.