Engineering Department: Infiltration & Inflow Projects

As part of the City’s continuing efforts to reduce the amount of Infiltration and Inflow (I&I) into the City’s sanitary sewer system, a number of projects will be under construction throughout the city. These project range from large Capital Improvements to small repair and maintenance projects.

What is I&I?

Infiltration is groundwater that enters the sewer system through leaks in the sewer pipes and laterals. Inflow is storm water that enters the sewer system through downspouts that are connected to sewer lines. This effort to reduce I&I began in the late 1990’s and is a key component to the City’s Treatment and Collections System Master Plan.

For more information regarding the City of McMinnville’s Sanitary Sewer Lateral Program see this document: PDF of attached Q & A guide.

The City is currently working on the design of the Millers Addition Sanitary Sewer Reduction Project which will consist of repairing or replacing of the sanitary sewer pipelines. Specific information pertaining to this project includes: a vicinity map of the project area, project information sheet, and contact information is listed below.

Millers Addition Sanitary Sewer Rehabilitation Project

Project Status: Under Design

Project Bid Date:

City Contact: Engineer's Office, (503) 434-7312

Project Information Sheet

Initial Project Notification

2011 Dowtown Basin Inflow & Infiltration Reduction Project

Downtown Basin I & I Project Page (click here)

Project Status: Out for Bid (Advertisement for Bid)

Downtown Basin I&I Reduction Bid Results

Downtown Basin I&I Reduction Bid Tab

Downtown Basin I&I Reduction First Tier