If you want to effectively mitigate inflow and infiltration, you need to have a plan for the private side of your system.

Engineering firm CDM Smith has found across a number of I&I mitigation programs that private properties contribute an estimated 50 to 70 percent of total I&I for any given municipality. Their findings were confirmed during a comparison study in Revere, Massachusetts.

Following a consent decree negotiation in 2010, Revere set out to remove 40 to 50...