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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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Other Water Quality Reports

Bull Run springs copyright Roman Johnston

Triannual Water Quality Analysis

The Portland Water Bureau prepares a detailed monitoring report three times a year in April, August, and November. This report presents analysis results for Portland's water to those needing technical data.

Triannual Water Quality Analysis - August, 2020

Triannual Water Quality Analysis - May, 2020 (Due to the Covid-19 Pandemic, the April Triannual was collected in May, 2020) 

Triannual Water Quality Analysis - November, 2019

Bull Run Treatment Variance Watershed Report - Water Year 2019

As required by the Bilateral Compliance Agreement regarding the treatment for Cryptosporidium, the Portland Water Bureau must conduct field inspections and environmental monitoring in accordance with  Interim Measures Watershed Inspection and Monitoring Plan. The report is updated annually.

 Bull Run Water Source Assessment Report

A Source Water Assessment for the Bull Run water supply identifies the geographic area that supplies water to the City of Portland and inventoried the potential contaminant sources that may impact the water supply. The report was written in 2003 and updated in 2006.

Water Quality Corrosion Control Study

In April 2014 the Portland Water Bureau began a Water Quality Corrosion Control study to better understand the mechanisms of the corrosion of lead from building plumbing in Portland's system. The study was done in response to a better understanding of the health effects of low level exposure to lead and in light of upcoming changes to Portland's drinking water system. The final report is expected by March 2017, but preliminary results from four quarters of data collection have guided the Portland Water Bureau's recommendation for increased corrosion control treatment. Below are the draft quarterly reports:

 Quarter 1

 Quarter 2

 Quarter 3

 Quarter 4