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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

Middle Hillsdale Inflow and Infiltration Pilot Project

Updated March 17, 2018

Environmental Services is continuing construction on a project to reduce the inflow and infiltration of stormwater and groundwater into separated sanitary sewer pipes in Southwest Portland -- pipes that are designed to carry only sewage. When storm drains are directly connected to sewer pipes or when cracks in sewer pipes allow groundwater to flow into them, this inflow and infiltration can overload the public sewer system and cause overflows into ditches and nearby waterways. By repairing sewer service laterals that connect houses and properties to the main line public sewer, this project will help keep stormwater and groundwater out of the sanitary sewer system and reduce the risk of overflows.


Work will occur on streets identified with bold red lines on the map below.

Project Map


Crews are currently working on the central and southern sections of the project. They are preparing to move to the northern section in April-May. Crews may be working at multiple locations at one time.

Approved work hours are 7 a.m. to 6 p.m. Monday through Friday, and the same hours on Saturday as needed.

Construction is anticipated to be completed by the end of December 2018.

What to Expect During Construction

The city's contractor, Titan Utilities, 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 or the Pipe Bursting 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. 

For more information on the neighborhood and street impacts you can expect during construction, see the Project Overview.

Construction Methods

The city’s contractor will use trenchless methods where possible to replace most of the laterals on private property, which will reduce the amount of excavation required.

Because of higher than anticipated groundwater levels in the central and southern sections of the project area, the city's contractor had to switch construction methods from Cured-in-Place-Pipe Lining to Pipe Bursting. While pipe bursting is still a trenchless method, it is more disruptive. Click here for more information about the construction methods used in this project, including Cured-in-Place-Pipe Lining and Pipe Bursting.  

As the city's contractor moves to other sections of the project area, they will assess conditions and determine the best approach for replacing the sewer service laterals. 

For More Information

Please note that the city is not accepting additional properties into the project. If you are uncertain about the status of your participation in this project, or have questions and concerns you would 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 RDII" in the subject line of your email.

Community Outreach

Check out current and previous communications about the project

Project Overview

Including the project description, map and schedule

Sign Up For Project Updates

Get project updates by email