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Portland Water Bureau

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


1120 SW Fifth Ave, Suite 600, Portland, OR 97204

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Water Quality

Portland is fortunate to have two high-quality drinking water sources, the Bull Run Watershed and Columbia South Shore Well Field. The Portland Water Bureau works diligently to protect this essential resource and deliver drinking water to your tap that meets or surpasses all federal and state drinking water standards.

The Portland Water Bureau tests for more than 200 regulated and unregulated contaminants in our drinking water. We collect samples across the entire system, from source water at the Bull Run Watershed and Columbia South Shore Well Field, to in-town reservoirs and main water lines, to customer taps. Water quality testing allows us to monitor the effectiveness of disinfection and treatment to meet regulations to protect public health.

The Portland Water Bureau is required to meet both federal and state water quality regulations. The U.S. Environmental Protection Agency (EPA) is responsible for establishing federal standards through the Safe Drinking Water Act (SDWA). The Oregon Heath Authority (OHA) is responsible for setting the state standards through the Oregon Drinking Water Quality Act. The Portland Water Bureau is required to comply with these regulations and must routinely report water quality test results to the EPA, OHA, and the public.


Questions about your water quality or water pressure?

Contact the Water Line: 503-823-7525 or (8:30 am to 4:30 pm Monday-Friday)


In this section you will find:

Source Water Treatment

Where Portland’s drinking water comes from and how the Portland Water Bureau treats your drinking water.

Bacterial Monitoring

Portland Water Bureau's compliance with the Total Coliform Rule

Unidirectional Flushing

The flushing of water mains is part of the Water Bureau’s on-going water quality and system maintenance work.

Frequently Asked Questions about Water Quality

Answers to common water quality questions.

Cross Connection & Backflow

Monitoring and maintenance of the drinking water distribution system to reduce risk of contamination.

Drinking Water Quality at Home

Learn more about water quality concerns that may happen in the home and what you can do about them.