Overview
Vernonia STP is a municipal wastewater treatment plant serving approximately 2,300 residents in Vernonia, Oregon, USA. The facility discharges treated effluent into the local watershed under the Clean Water Act regulatory framework.
Vernonia STP is a municipal wastewater treatment facility located at 660 California Avenue in Vernonia, Columbia County, Oregon. The plant serves a population of about 2,317 residents, placing it in the small community category for US wastewater infrastructure. Its location in the Pacific Northwest subjects it to a temperate rainforest climate with high annual precipitation, which influences both influent volumes and receiving water conditions. As a US facility, Vernonia STP operates under the Clean Water Act administered by the Oregon Department of Environmental Quality (DEQ). The National Pollutant Discharge Elimination System (NPDES) permit program sets effluent limits based on water quality standards for the receiving water body. For a plant of this scale, secondary treatment is typically required, though specific treatment processes and capacity details are not publicly available in this record. The plant's treated effluent discharges to a local waterway that ultimately drains to the Nehalem River, which flows westward to the Pacific Ocean near Nehalem Bay. This coastal watershed supports salmonid species including Chinook and coho salmon, as well as steelhead trout, making water quality protection critical for aquatic habitat and downstream estuarine ecosystems.
Environmental context
Vernonia STP discharges into a tributary of the Nehalem River, which flows approximately 118 miles to the Pacific Ocean at Nehalem Bay. The Nehalem River watershed encompasses forested and agricultural lands, supporting diverse aquatic life including threatened salmon and steelhead runs. The downstream Nehalem Bay is an ecologically sensitive estuary that provides critical habitat for migratory birds and juvenile fish. Protecting water quality in this system is essential for maintaining the ecological health of both the river and the coastal marine environment.
Frequently asked questions
Vernonia STP is located at 660 California Avenue in Vernonia, Columbia County, Oregon, United States.
The plant serves approximately 2,317 residents, making it a small community wastewater treatment facility.
The plant discharges treated effluent to a local tributary of the Nehalem River, which flows to the Pacific Ocean via Nehalem Bay.
As a US facility, Vernonia STP operates under the Clean Water Act and is regulated by an NPDES permit issued by the Oregon Department of Environmental Quality.
Small US plants typically employ secondary treatment processes such as activated sludge or lagoon systems to meet NPDES permit limits for BOD, TSS, and other parameters.
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