Portland approves water filtration plant to treat for parasite

FILE -- Bull Run Reservoir.

Portland's City Council has voted unanimously to pursue building a water filtration plant to treat drinking water from Bull Run.

That's the most expensive option available to treat water from the mountain reservoir -- some estimates top $500 million.

At issue is several recent water tests found a parasite called cryptosporidium.

Federal regulations require water treatment after that many positive tests.

Almost a million people in the metro area get their water from Bull Run.

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