Overview
The DEARY S_T FACILITY in Lewis County, Idaho, provides secondary treatment for a small community of 506 residents, discharging treated wastewater into the local watershed.
The DEARY S_T FACILITY serves the small community of Lewis County, Idaho, treating wastewater for approximately 506 residents. As a secondary treatment plant, it meets the standard requirements under the U.S. Clean Water Act for municipal wastewater treatment, ensuring that pollutants are reduced to protect public health and the environment. The plant has a designed capacity of 620.81 volume units and currently handles a discharge volume of 908.50, indicating it operates within its capacity. Secondary treatment typically involves biological processes to break down organic matter. The treated effluent is discharged into the local watershed, which ultimately drains into the Clearwater River and then the Snake River, a major tributary of the Columbia River. This waterway supports diverse aquatic life and is important for regional ecology and recreation.
Environmental context
The plant discharges into the local watershed that flows into the Clearwater River, a key tributary of the Snake River, which eventually reaches the Columbia River and the Pacific Ocean. The downstream environment supports salmon and steelhead runs, making water quality protection critical for these ecologically and economically important species.
Frequently asked questions
The DEARY S_T FACILITY is located on Morrowtown Road in Lewis County, Idaho, United States.
The plant serves a population of approximately 506 residents in the Lewis County area.
The plant provides secondary treatment, which typically involves biological processes to reduce organic matter and suspended solids.
As a municipal wastewater treatment plant in the United States, it operates under the Clean Water Act and is subject to National Pollutant Discharge Elimination System (NPDES) permits issued by the state or EPA.
For small communities of this size, secondary treatment is standard, often using lagoons, activated sludge, or trickling filters to meet EPA effluent guidelines.
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