How Sewer Blockages Affect the Environment

The Cause of Sewer Overflow

  • The start of a blocked pipe begins when grease and solids collect on the top and sides of the pipe
  • interior.
  • The build-up increases over time when grease and other debris are washed down the drain.
  • Excessive accumulation will restrict the flow of wastewater and can result in a sanitary sewer overflow.
  • For more information, view this diagram showing the effects of sewer blockage (PDF).

The Process of Sewer Overflow

  1. Grease and solids accumulate and block the flow of wastewater.
  2. Wastewater backs up in manholes, sewer cleanouts, and even home plumbing.
  3. Sanitary sewer overflows occur and expose untreated wastewater to humans, animals, and the environment.