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Sewage water pollution is one of the major problems in cities. Improper handling of waste water is the main reason behind the pollution of water. The careless disposal of sewage water leads to a chain of problems, such as spreading of diseases, eutrophication, increase in Biological Oxygen Demand (BOD), etc. Following are important causes of Sewage water pollution.

• • Overflow, spill, or release of raw or partially-treated sewage from a sanitary sewer collection system.
  • Pipes are blocked by tree roots, grease and debris in sewage.
  • The private or public sewer lines are cracked.

• An aging sewer infrastructure also increases the occurrence and severity of overflows.
• Storm flows received may be in excess of system capacity which can result in overflows from the sewerage pipe network.
• Overflows caused by rainwater getting into the sewer through faults in pipes or illegal connections, exceeding the capacity of the system.
• Poorly fitting cracked or broken inspection holes on the mains sewer system can let water into the sewerage system.