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I&I is clear water—stormwater and groundwater—that enters the wastewater collection system. When rain or stormwater end up in wastewater pipes, it can:
• overload the system and can cause costly sewer backups into homes and buildings;
• cause sewer overflows into creeks and rivers; and
• take up capacity at the treatment plant resulting in higher treatment costs
Inflow is water entering the sewer system through improper connections. Typical sources include roof drains/downspouts, sump pumps and yard or foundation drains illegally connected to the sewer.
Infiltration occurs when groundwater seeps into sewer pipes through cracks, leaky pipe joints and/or deteriorated manholes.
How residents can prevent I&I:
• Make sure roof drains, yard/foundation drains or sump pump discharges are not connected to the wastewater pipes
• Inspect your sewer cleanout and make sure the cap is on tight and the pipe is not damaged
• Don’t plant trees or shrubs over or near where your wastewater pipe is buried
• If your private sewer line is broken or cracked, have it repaired or replaced by a licensed contractor