The answer to 'lifespan of water line replacement' is that a properly installed and maintained water line can last 50-100 years or more. The lifespan of a water line depends on several factors, including the material used, the quality of the installation, and the local soil and water conditions.
Copper and PEX (cross-linked polyethylene) water lines typically have the longest lifespan, often lasting 50-100 years or more with proper care. Galvanized steel and polybutylene pipes are more prone to corrosion and may need replacement after 20-50 years. The location of the water line, such as whether it's buried underground or exposed, can also impact its lifespan.