The answer to 'difference between water line' is that a water line and a sewer line are two distinct components of a home's plumbing system. A water line is the pipe that brings fresh, clean water into your home, while a sewer line is the pipe that carries wastewater and sewage out of your home and into the municipal sewer system or a septic tank.
Water lines are typically made of copper, PEX, or PVC piping and carry water at high pressure for use in sinks, showers, washing machines, and other household appliances. Sewer lines are usually made of cast iron, PVC, or ABS piping and carry waste at a lower pressure to the municipal sewer or septic system. Proper maintenance and repair of both water and sewer lines is essential for a well-functioning plumbing system in your home.