Inflow and Infiltration Reduction Efforts December 06, 2017
Inflow and Infiltration (I & I) refers to when groundwater and stormwater (“clean water”) enters the sanitary sewer system through joints, cracks, and deficiencies. This extra water in the sewer lines goes to the wastewater treatment plant where it is treated like sewage, resulting in higher treatment costs. To reduce these costs, the City has created a 20-year Takedown List that focuses on Treatment Plant upgrades and I&I reduction projects. The City performs several of these projects each year. This year the City completed four I & I reduction projects totaling approximately $1M.
These types of projects are best constructed in the summertime, however, now that winter is upon us, the staff has begun coordinating the design for next year’s projects. In total, the City has approximately 90-miles of sanitary sewer piping. The pipes range in age from brand new to 100-years old. The City is committed to reducing the I & I that enters these pipes not only to reduce treatment costs at the plant but also to increase the pipes’ life. If you have any questions, please contact the City’s Wastewater Project Engineer, Jennifer Wirsing, at 541-269-1181 extension 2247.