GENERAL INFORMATION: 503-823-7404
1120 SW Fifth Ave, Suite 600, Portland, OR 97204
Recent routine monitoring at the Bull Run intake detected the presence of Cryptosporidium oocysts. One sample, collected January 2, 2017 detected two oocysts while a second sample collected January 3, 2017 detected an additional three oocysts. This monitoring is performed as part of the requirements for Portland’s treatment variance for Cryptosporidium issued by the Oregon Health Authority (OHA).
At this time, we do not believe there is a public health risk as a result of this detection and the public is not being asked to take any precautions.
On March 14, 2012 OHA issued the Portland Water Bureau a variance from the federal drinking water rules requiring the treatment of Bull Run drinking water for Cryptosporidium. As a result of the variance the Portland Water Bureau does not treat for Cryptosporidium.
The treatment variance was issued in accordance with federal and state law and is valid for 10 years. The following are among the conditions contained in the variance:
The Water Bureau must
Raw Water Monitoring:
Reporting and Notification:
The Water Bureau must:
Cryptosporidium monitoring results from the intake, Bull Run tributaries and wildlife scat are summarized quarterly in the list of current projects in the Bull Run Watershed Management Unit.
OHA may revoke the variance if the Water Bureau cannot meet the requirements of the variance, if EPA amends the LT2 rule in a manner that affects the provisions of the variance or if OHA deems that the lack of treatment for Cryptosporidium poses an unreasonable threat to public health.
OHA issued the treatment variance based on the Portland Water Bureau’s comprehensive LT2 Treatment Variance Request. The variance request was based on the results of a year-long water quality Sampling Plan and Study of Bull Run water and other supporting information.
More information on the basis for and requirements of the Water Bureau’s treatment variance are in the Final Order Issued by OHA Granting Portland's Treatment Variance.
Visit the Oregon Health Authority’s Bull Run Treatment Variance website for additional information.
June 6, 2011
Treatment Variance Watershed Inspection and Monitoring Plan
December 16, 2016