Overview
DECLO STP is a secondary treatment plant serving 343 people in Cassia County, Idaho. It discharges 189.27 megaliters of treated wastewater annually, with a designed capacity of 227.12 megaliters.
DECLO STP is a municipal wastewater treatment plant located in Cassia County, Idaho, United States. It serves a small population of 343 residents, reflecting its role in a rural community. The plant is situated along State Highway 77, providing essential sanitation services to the area. The plant operates at the secondary treatment level, which is the standard required by the U.S. Clean Water Act for municipal facilities. With a designed capacity of 227.12 megaliters and an annual discharge volume of 189.27 megaliters, it operates well within its capacity. As a small-scale facility, it is subject to EPA National Pollutant Discharge Elimination System (NPDES) permitting, administered by the Idaho Department of Environmental Quality. The treated effluent is discharged into a local water body, contributing to the Snake River basin, which ultimately drains to the Columbia River and the Pacific Ocean. The plant's operations help protect downstream water quality in this agriculturally important region.
Environmental context
DECLO STP discharges into a local tributary within the Snake River basin, which flows into the Columbia River and eventually reaches the Pacific Ocean. The surrounding area is primarily agricultural, and the plant's secondary treatment helps reduce nutrient and pathogen loads, supporting aquatic life in the downstream waterways. The Snake River basin supports diverse fish species, including salmon and trout, making water quality management critical.
Frequently asked questions
DECLO STP is located on State Highway 77 in Cassia County, Idaho, United States, serving a small rural community.
DECLO STP serves a population of 343 people, typical of a small municipal wastewater treatment plant in rural Idaho.
DECLO STP discharges treated effluent into a local water body within the Snake River basin, which flows to the Columbia River and the Pacific Ocean.
DECLO STP operates under the U.S. Clean Water Act, requiring an EPA NPDES permit administered by the Idaho Department of Environmental Quality. Secondary treatment is the minimum standard for municipal plants.
For small populations like 343, U.S. plants typically use secondary treatment (e.g., activated sludge or lagoon systems) to meet NPDES permit limits for BOD, TSS, and nutrients.
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