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The City of Portland, Oregon

Portland Water Bureau

From forest to faucet, we deliver the best drinking water in the world.

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Bull Run Filtration Project

  • Site Advisory Meetings The Filtration Facility Site Advisory Group meets monthly to help develop a Bull Run Filtration Good Neighbor Agreement by providing an independent community perspective on the facility design, construction, and ongoing operation.

  • Filtration Project Update at September City Council Work Session Sept. 19: City Council hears update on progress, new cost estimate for Bull Run Filtration Project

  • Community Values and Investment Options Building a Filtration Project Based in Community Values

  • Filtration Information and Updates Learn what's happening with the City's process for building a water filtration plant.


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Portland is building a new filtration facility to keep our water safe and abundant for generations to come. The new filtration plant will remove the microorganism Cryptosporidium and must be completed by 2027 to comply with state and federal water quality rules. The filtration facility will also remove sediment, organic material, and other potential contaminants, providing consistent high-quality drinking water and making the water system more reliable.

Building a filtration facility of this size takes about a decade to plan, design, permit, and construct. The Portland Water Bureau has already begun work on the initial steps and has made some key decisions about the future filtration facility .


map location iconLocation

The new filtration facility will be located just outside the Bull Run Watershed in rural Multnomah County. Portland Water Bureau has owned the filtration facility property for decades and has been operating facilities in the area for more than 100 years. The filtration facility site was selected because it met the requirements—the site is at the right elevation to work with existing infrastructure, it’s owned by Portland Water Bureau, the facility is consistent with the site’s zoning requirements, and it’s large enough to provide a buffer around the facility and its neighbors. Portland Water Bureau is committed to being a good neighbor through planning, design, construction, and future operations of the new facility. Visit the Neighbor Information page to learn more about the filtration facility site and the good neighbor process.


Icon of 160 mgdSize

The new filtration facility will have a capacity between 145 and 160 million gallons per day (mgd). This capacity continues Bull Run as Portland’s main water supply, meets water demands on most days in most years, and manages costs by matching filtration facility size to expected water use.


filtration technology iconFiltration Technology

The new filtration facility will use granular media filtration, where the water is filtered through natural materials (charcoal, sand, and gravel). This is a proven technology used at almost all the large filtration facilities in North America. Granular media filtration is the lowest cost option that can provide the desired water quality. Granular media filtration also provides excellent water quality, is flexible in adapting to different water conditions and new requirements, and fits on the filtration facility site with room to meet future needs.


These investments in the future of Portland’s drinking water will be funded through business and residential customer rates and by borrowing money over time. Borrowed money will be repaid over many years so that the cost is shared by current and future customers.

Portland Water Bureau is committed to keeping water rates affordable by actively managing costs throughout the life of the project. We will continue to assist those who struggle to afford their bill through the expanded low-income assistance program. If you’re having trouble affording your bill, our Financial Assistance program may be able to help.

Project Schedule

Learn about major activities needed to plan, design, and construct the new filtration plant.

Information on Cryptosporidium

Learn more about efforts to monitor and minimize risks from Cryptosporidium in the Bull Run watershed.

Questions? Contact Us

Submit a question about Bull Run filtration or corrosion control.

Bull Run Treatment Projects

Over the next 10 years, the Portland Water Bureau will be making two major treatment changes to the Bull Run.