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Environmental Services

working for clean rivers

Phone: 503-823-7740

Fax: 503-823-6995

1120 SW 5th Avenue, Room 1000, Portland, OR 97204

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Middle Hillsdale Inflow and Infiltration Pilot Project

Sign up for email updatesMiddle Hillsdale Inflow and Infiltration Pilot Project

Private Property Sewer Repair Update April 2016

sources of inflow and infiltrationEnvironmental Services is nearing completion of a pilot project designed to keep stormwater and groundwater out of sanitary sewers in southwest Portland. Inflow of stormwater and infiltration of groundwater into pipes designed to convey only sanitary sewage occur either because storm drains are directly connected to the sanitary sewer or because cracks in sanitary sewer pipes allow groundwater to flow into the public sewer main. This inflow and infiltration causes the sewer main to overflow at low points and drain into ditches or nearby waterways.

Developments of Note

Environmental Services has completed two pilot projects.


Construction is scheduled to begin in spring 2016.

Construction Method

The city’s contractor will use trenchless methods to replace most of the laterals on private property, which will reduce the amount of excavation required. Our contractor will be in contact with you before any work begins within the easement on your property.

Contact Information

It will be important to be able to communicate with you both before and during the work to replace the lateral to your home. We want to make sure that your home phone number, your mobile phone number and email address are current to ensure that we can contact you before and during construction on your property.

Please email or call 503-823-2934 with your contact information.

What to Expect During Construction

  • Construction creates noise, vibration and dust and disrupts normal neighborhood activity.

  • Typical work hours are 7:00 a.m. to 6:00 p.m. Monday through Friday, but the contractor may schedule work during the same hours on Saturdays.

  • The contractor will repair most of the pipe using trenchless technology. Go to for more information.

  • Traffic control signs are in place. The contractor maintains local access, but you should expect delays.

  • On-street parking in or near the work area may be limited. Please observe no parking signs.

  • The contractor may store equipment and materials on nearby streets overnight.

  • Sewer, water and other utilities will remain in service during construction.

  • Please stay clear of all construction activities and keep children, pets and vehicles out of construction and equipment storage areas.

A city inspector is on-site during work hours and may be able to assist you with construction concerns. Inspectors typically wear a hard hat and safety vest with “City of Portland” on the back.

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For More Information

Contact Joe Annett, 503-823-2934.

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