What is classified as an inflow source of wastewater?

An inflow source of wastewater refers to any water that enters the wastewater collection system from outside sources, typically in excess of what is intended. Connections from clean water discharges, such as improperly connected stormwater drains or roof leaders, can introduce clean water into the sewage system. This clean water inflow can dilute the wastewater and increase the volume flowing through the treatment facilities, potentially leading to issues such as overloading the system and reducing treatment efficiency.

Other sources mentioned, like groundwater from aquifers and leakage from sewage pipes, are generally considered different types of inflow or infiltration rather than direct inflow sources that are intentional. Rainfall runoff, while it can increase flows into the sewer systems during wet weather, is often treated specifically under the category of stormwater management rather than being classified as inflow in the context of wastewater treatment. Thus, connections from clean water discharges represent a clear and identifiable inflow source that can directly impact wastewater operations.