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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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Historical Cryptosporidium Monitoring at the Bull Run Intake

The following is a compilation of Cryptosporidium monitoring performed by the Portland Water Bureau from 1986 to 2018. Recent results can be found on the Cryptosporidium Documents page.

1986-2009: Historical Data Set compiled as supporting information for Portland Water Bureau’s Variance Request to the treatment requirements of the LT2 rule.

December 2010 - March 2012 –Interim Monitoring results from Bull Run Intake between one-year study and issuance of the Variance.

April 2012 – 2017: Variance Compliance Period monthly reports by year.

2018 - Present: Bilateral Compliance (beginning December 18, 2017)