If you stop by the Salmon Creek Wastewater Treatment Plant, the second thing you’ll notice is the stunning views of a meandering Salmon Creek framed by maple and ash trees in full fall foliage with Mount Hood towering in the background. But the first thing you’ll notice is the odor — or rather the lack thereof.

Upgraded towers use bacteria to filter air from the plant before being released, eliminating odors once common at such facilities.

“Air regulations had advanced to the point that we needed to cover these facilities and treat the air for odors,” said John Peterson, general manager at the plant.

Discovery Clean Water Alliance owns the plant, and Clark Regional Wastewater District manages operations. The plant sits on 20 acres at the confluence of Salmon Creek and Lake River north o

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