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The City of Portland, Oregon

Environmental Services

working for clean rivers

Phone: 503-823-7740

Fax: 503-823-6995

MAILING ADDRESS: 1120 SW 5th Ave, Room 1000, Portland, OR 97204

More Contact Info

Project Overview

Environmental Services is continuing construction on a project to help keep stormwater and groundwater out of sanitary sewers in Southwest Portland. Inflow of stormwater and of groundwater into sewer pipes occurs when storm drains are directly connected to the sanitary sewer or because cracks in sanitary sewer pipes allows groundwater to flow into the public sewer main. This is known as "inflow and infiltration" and can overload the sewer system and cause sewer mains to overflow at low points and drain into ditches or nearby waterways.

The Middle Hillsdale Inflow and Infiltration Pilot Project will help keep stormwater and groundwater out of the sanitary sewer system by repairing sewer laterals that connect houses and properties to the sewer main.


Construction began in the summer of 2018 and will continue through December 2018.