How can beautiful trees outside a home cause the need for an emergency sewer backup cleanup? Old underground sewer pipes, especially in cities such as Manchester, NH, are susceptible to root infiltration. The combination of aging plumbing and growing roots can cause a blockage. When the outflow of sewage is impeded a backup occurs. If sewage is flowing back into the house it is an emergency. Immediate action must be taken to fix the blockage. Sewer backup cleanup is needed as well.