Overview
Molalla STP serves approximately 7,950 residents in Molalla, Oregon. The plant discharges treated wastewater into local waterways within the Willamette River basin.
Molalla STP is a municipal wastewater treatment facility located in Molalla, Clackamas County, Oregon. The plant serves a population of about 7,950 people, making it a small to medium-sized agglomeration under U.S. regulatory frameworks. It operates under the U.S. Clean Water Act, which requires National Pollutant Discharge Elimination System (NPDES) permits for all discharges to surface waters. As a facility of this scale, typical treatment includes secondary biological processes to meet state and federal effluent limits. The plant's design and operational details align with Oregon Department of Environmental Quality standards, which mandate compliance with water quality criteria for the protection of aquatic life and human health. The treated effluent from Molalla STP is discharged into the Molalla River, a tributary of the Willamette River. The Willamette River flows north through the Willamette Valley before joining the Columbia River, which ultimately reaches the Pacific Ocean. The plant plays a key role in preserving water quality in this ecologically important watershed, which supports diverse fish species including salmon and steelhead.
Environmental context
The Molalla STP discharges into the Molalla River, a tributary of the Willamette River. The Willamette River flows into the Columbia River, which empties into the Pacific Ocean. This watershed supports critical habitats for anadromous fish such as Chinook salmon and steelhead trout, as well as other aquatic species. The plant's operations help maintain water quality standards essential for these ecosystems.
Frequently asked questions
Molalla STP is located at 11820 Toliver Road, Molalla, Clackamas County, Oregon, United States.
The plant serves approximately 7,950 residents in the Molalla area.
The treated effluent is discharged into the Molalla River, a tributary of the Willamette River, which flows to the Columbia River and the Pacific Ocean.
The plant operates under the U.S. Clean Water Act, requiring an NPDES permit issued by the Oregon Department of Environmental Quality to ensure compliance with water quality standards.
Plants of this scale typically employ secondary treatment processes, such as activated sludge or trickling filters, to meet federal and state effluent limits for biochemical oxygen demand and suspended solids.
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