Anything that should not be in a sewer line has the potential of causing a blockage. For example:
- Kitchen grease, disposable diapers, and sanitary napkins can accumulate and cause a blockage.
- Tree roots seeking moisture can grow through cracks in the lines, causing a blockage.
- Vandals have stopped up lines by putting bricks, wood, oil filters, bed springs, and even Christmas trees in manholes.
- Illegal hookups allow excess water into the lines. Outside stairwell drains, sump pumps, roof leaders, and drain gutters should never be connected to the sewer system. A sewer system is designed to carry a predetermined amount of sewage. Rainwater not only overloads the system, but also raises the cost of the treatment process.