Wednesday - February 8, 2017

Recent Cryptosporidium Detections in Portland Bull Run Water

The Portland Water Bureau recently detected the presence of Cryptosporidium, a potential pathogenic microorganism, in several samples collected at their Bull Run intake in January and February.

Although our water systems are close to Portland’s, the City of Lake Oswego and Tigard Water Service Area customers receive their drinking water from a different source and the treatment process is also different than Portland’s. Lake Oswego and Tigard Water Service Area’s primary water source is the Clackamas River. The recently upgraded filtration system at our water treatment plant removes Cryptosporidium and pathogens that may be detected in the Clackamas River water supply. Ozone, a powerful oxidant, also provides an additional treatment barrier to protect public health. 

The Partnership delivers high-quality drinking water from the Clackamas River to the communities of Lake Oswego and Tigard, which meets and exceeds all federal and state drinking water standards. Our new plant upgrades consist of an effective and state-of-the-art water treatment process that will provide decades of excellent, high-quality drinking water to Lake Oswego and Tigard customers.

For more information about Portland Water Bureau’s detection and monitoring visit:

For more information about Lake Oswego and Tigard’s water treatment process visit:

If you are not sure where you receive your water, use the following maps to see what district you are in: