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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.

Customer Service: 503-823-7770


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Water Quality Summary

The Portland Water Bureau is currently delivering a Bull Run water/groundwater blend with 25-35% groundwater.

Starting on June 20, 2018, the Portland Water Bureau began supplementing the Bull Run supply with water from the Columbia South Shore Well Field. The expected blend of groundwater to Bull Run water is 25-35% groundwater.

The table below shows a comparison of the expected range of the groundwater blends and water quality data for Bull Run water and groundwater from past results. This table provides an estimate of water quality and the actual results at your tap may differ from what is shown below based on natural variation within the drinking water system, the wells used during the course of the groundwater operation, water demand, or how the Portland Water Bureau is operating the system. The Portland Water Bureau is currently delivering a 65-75% Bull Run/25-35% groundwater blend, and 100% Bull Run water and groundwater past results are included below as a comparison.

Last Updated: June 21, 2018

  1. Most recent values measured in Bull Run raw or treated water.
  2. Average values measured at the Groundwater Pump Station Outlet from 2007 through 2017.
  3. (S) denotes a secondary standard established by the EPA as a guidance to assist public water systems in managing drinking water for aesthetic considerations, such as taste, color and odor. These contaminants are not considered to present a risk to human health at this standard.  

For more information about Portland’s drinking water quality, call the Water Line at 503-823-7525 or visit