Inflow is the direct introduction of ground or surface water into a sanitary sewer system. Foundation drains connected to a sewer lateral. Carport drains connected to a sewer lateral. Uncapped sewer cleanout located in water runoff area. Sump pump discharge of ground water into sanitary sewer.
Infiltration is the leaking of ground or surface water into a properly constructed sewer system.
Cracked or broken sewer lateral. Basement wall leaking and flowing into floor drains. Modified floor drains that collect ground water. That would mean all sewer lines would have to be oversized and the sewage treatment plant would have to be expanded. I would increase your sewer bill at least six times greater than the current rate .