Private Property Infiltration & Inflow

What Private Property Infiltration and Inflow Is

Water can enter the sewage system in many ways, including leaky pipes and connections, often on a homeowner's own property. The increased flow after a storm can cause problems throughout the system, including your basement.

But basement backups are only a symptom. The problem is bigger and requires a bigger solution – full cooperation from all municipalities, neighborhoods and homeowners. It's a serious problem, and it will not go away. In fact, it will only get worse if we don't get to work.

Video of water infiltration and inflow

Inflow diagram Opens in new window


  • Infiltration – Water leaking into the sewer system through defective pipes, pipe-joint connections and manhole walls.
  • Inflow – Water flowing freely into the sewer system through piped connections such as downspouts and street catch basins.
  • Lateral – The pipe that connects the home to the sewer system. A lateral is the homeowner's property and responsibility.