What is I&I?

The Bad News...
Corunna Sewers Have I & me.
(Inflow & Infiltration)

Inflow/infiltration describes groundwater and stormwater that flows into a sanitary sewer system through leaky sewer lines and manholes and from direct sources such as catch basins, roof drain connections, and sump pump connections.

Inflow/infiltration increases the quantity of wastewater a municipality must treat, thus reducing the capacity of sewer lines, pumping stations, and the wastewater treatment plant. This raises the cost of operating and maintaining wastewater infrastructure, and that cost is passed along to businesses and residences through rate hikes. By reducing capacity, inflow/infiltration also limits future sewer connections.

The Good News...
We Could Have Worse Problems!