Most sewer backups happen because the pipe is plugged with debris. However, backups can be caused by several factors, including the condition of the sanitary sewer system itself, natural phenomena such as earth movement or roots, and the incorrect usage of the system by the public.

• Solids / Debris – Typical solids that build up in the pipe and cause backups are fats, oil, grease (FOG), dirt, hair, bones, sanitary products, paper towels, kitty litter, diapers, broken dishware, garbage, concrete, and debris.
  When oil or grease is discharged into a sewer system, they will solidify and, after a while, they can build up and plug drain lines in your building or complex. They can also plug the sewer lines and clog pump stations owned by the District, thus increasing the maintenance cost to the customers. Plugged sewers can cause flooding of nearby private homes and businesses.
• Tree Root Infiltration – Tree roots are attracted to sewer lines because of the sewer waters’ warm temperatures and food nutrients found in the sewers. Tree roots can cause backups. Roots can infiltrate the pipe system and clog the wastewater flow.