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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

Middle Hillsdale Inflow and Infiltration Pilot Project

Updated December 21, 2017

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.

Project Map

Developments of Note

The city's contractor is conducting work in phases throughout the project area:

  • Inspecting service laterals that connect private properties to the main line public sewer
  • Developing work plans for each participating property
  • Meeting with property owners to review and approve work plans
  • Obtaining plumbing permits
  • Installing cleanouts and backflow valves
  • Completing spot repairs where needed
  • Lining service laterals using the Cured-in-Place-Pipe Lining method

The city's contractor will provide advance notice of construction on your block, and will be contacting participating property owners before work occurs on their property.

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. Click here for more information about Cured-in-Place-Pipe Lining.

Contact Information

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

Please click SIGN UP to provide us your contact information.

For More Information

If you would like more information about the project or have questions and concerns you’d like to discuss, please call or email:

Cheryl Kuck
Community Outreach
Phone: 503-823-7898

If you have a concern or question about the work near you, please be sure to include your name, property address, and project name (Middle Hillsdale RDII) in your voicemail and email so we can provide you more details about what to expect in front of your property. Also, please write "Middle Hillsdale" in the subject line of your email. Click SIGN UP to sign up for periodic email updates.

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