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North Jantzen Avenue water main construction

Water System Improvement Construction
Engineering And Design
This project will bring existing water services and backflow devices at several properties up to current City code. We will replace approximately 2,200 feet of water main (pipe) with a more earthquake-resilient pipe. We will also replace five existing fire hydrants and install one new fire hydrant.
Spring 2022 to winter 2023
On this Page
A map showing a water main replacement along N. Jantzen Ave. The main replacement will go west from N. Pavilion Ave past Home Depot, the Ashley Homestore, and Jantzen Beach Moorage, a houseboat community on the Columbia River.

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When you sign up, be sure to check the box next to "North Jantzen west of Pavilion." 

Project overview

We are fixing 2,200 feet of aging pipes, installing backflow devices, and adding one fire hydrant to the south side of Jantzen Beach. This project will:

  • Make the water system more resilient in an earthquake
  • Protect the water system from contaminants from backflow
  • Improve water flow and supply to fight fires


North Jantzen Avenue from Pavilion Avenue west to the dead end. Some work will also take place to the north of the dead end on private property.


Fixing aging pipes

The water mains in the area have a history of leaks and breaks and need to be replaced. The pipes were made during a time when people didn't know about the danger of using the asbestos in the coating around the outside of the pipe. Even though asbestos can't get into the drinking water, it poses a hazard to our crews when they make repairs on the outside of the pipe.

Helping pipes endure ground movement

The earthquake-resistant ductile iron pipes we're installing will be safer to maintain. It will also make the system more seismically resilient in case of an earthquake.

Preparing to fight fires

New fire hydrants will improve firefighters' access to water and help the bureau continue to meet state fire codes.

Protecting against contamination

In addition to the leaking main, several water services in the area lack backflow devices. These devices are required by law to keep our water supply safe from contaminants. We will install backflow devices on services that need them to bring them up to City code. This will make sure your water stays clean even if there is an unexpected reverse of water flow. Learn more about backflow.

Upgrading our maps for future work

Last but not least, replacing the main will help us locate water mains and services so we can maintain and repair them more efficiently in the future.

What's happening now

The project is currently in the engineering and design phase. We are communicating with private property owners in the area about access to areas where we need to work. Construction is expected to begin in spring 2022.