The answer to 'what causes water line replacement' is that there are several common reasons why a home's water line may need to be replaced. The most common causes include old age, corrosion, tree root intrusion, freezing temperatures, and damage from construction or excavation work.
As water lines age, the pipes can deteriorate and develop leaks or cracks, which can lead to water damage and the need for replacement. Corrosion, particularly in older metal pipes, can also cause structural issues that require replacement. Tree roots can grow into and damage underground water lines, while freezing temperatures can cause the pipes to crack or burst. Finally, damage from nearby construction or digging projects can puncture or crush the water line, necessitating a full replacement.