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Oregon Health Authority required Portand Water Bureau to begin filtering Bull Run water in just under 10 years, and to take many other precautions in the meantime.

PORTLAND TRIBUNE FILE PHOTO - The Bull Run Reservoir, the primary source of much of the region's drinking water.The Portland Water Bureau must begin filtering Bull Run water to remove a potential disease causing microorganism by Sept. 30, 2027.

The filtration plant approved earlier this year by the City Council could cost up to $500 millon.

Before the plant is completed and begins operation, the PWB must make numerous efforts to detect the presence of Cryptosporidium in the primary source of much of the region's drinking water, and notify both health officials and the public of all positive findings.

Those are among the requirements included in a a bilateral compliance agreement between the PWB and the Oregon Health Authority that was signed on Monday. The Dec. 18 agreement needed to be neogiated after the OHA announced it was revoking a variance previously granted to the PWB from U.S. Environmental Protection Agency rules requiring Bull Run water to be treated for crypto, as it is commonly called.

The OHA granted the variance in 2012 because Bull Run water has historically been relatively free of crypto. Multnomah County health authorities say there is no proof anyone has ever been made sick by drinking it.

Many of the requirements in the agreement were already inlcuded in the variance, including notifying the public of crypto detections. The agreement also continues a program currently conducted by the PWB to collect samples of animal scat in the Bull Run Watershed and test them for crypto, which is found in many animals and spread through their feces.

New requirements in the agreement include:

• Slightly more frequent public notification requirements with specific required language.

•Commitment to work with OHA and public health partners on public health surveillance activities and to address a public health risk if OHA determines that one is occurring.

• Outreach plan for vulnerable populations and annual report on outreach activities.

• Quarterly status reports reporting on monitoring results, watershed activities and construction activities

Most strains of crypto do not cause people to become sick. The most dangerous strains are carried by livestock and humans. Livestock and unauthorized visitors are banned in the watershed.

Since the behinning of the year, crypto has been detected in Bull Run water 35 times.

Find out more

You can learn more and track the monitoring results at www.portlandoregon.gov/water/75112

You can read the agreement at www.portlandoregon.gov/water/article/666677

You can read a previous Portland Tribune story on the issue at portlandtribune.com/pt/9-news/379157-265044-parasite-found-in-bull-run-before

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