Sources of I/I
Inflow sources within the public right-of-way can include sanitary manhole covers and storm water catchbasins that are inadvertently tied into the sanitary sewer. Private land areas (outside of public right-of-way) inflow sources include roof downspout connections, yard and driveway drains, broken or missing sanitary lateral cleanout caps, and sump pump connections to the sanitary sewer system. These connections are illegal and can add thousands of gallons of storm water into the sanitary sewer system per household during large rain events. Inflow sources are usually easy to remediate.
Private infiltration sources can include broken lateral sewers, faulty lateral connections, tree root penetration, and broken cleanouts.
These sources can overload the sanitary sewer system and cause sanitary sewer backups into homes and businesses, as well as sanitary sewer overflows (SSOs) to nearby creeks.