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

Bacterial Monitoring How the Portland Water Bureau samples and tests for bacterial contamination.

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.

Drinking Water Test Results & Reports Portland’s test results from over 11,000 water samples collected each year.

Reducing Lead Exposure Information and resources to reduce exposure and hazards from lead in water.

Cross Connection & Backflow Monitoring and maintenance of the drinking water distribution system to reduce risk of contamination.

Developments in Water Quality Information about compounds that are not currently regulated.

Drinking Water Quality at Home Learn more about water quality concerns that may happen in the home and what you can do about them.