Root intrusion (cast-iron laterals)
Brockton's 1920s-era cast-iron service laterals develop hairline cracks at the bell-and-spigot joints over a century of service. Maple, oak, and elm roots in the lawn between the foundation and the public main exploit those cracks, growing into the pipe and forming a mesh that catches paper and grease. Mainline cable with a root-cutting head clears the immediate blockage; a hydro-jet flush removes the loose root mass; the SeeSnake camera confirms whether the joint needs spot repair or trenchless replacement.