PRIMGAR STL Wastewater Treatment Plant, Hartley, Iowa

PRIMGAR STL is a municipal wastewater treatment plant located in Hartley, Iowa, a small community in O'Brien County. The plant serves a population of around 950 residents, providing essential sanitation services for the area. As a secondary treatment facility, it meets the standard requirements for organic matter and suspended solids removal under the U.S. Clean Water Act. The plant has a designed capacity of 416.39 million gallons per day and currently handles an average daily flow of 340.69 million gallons, indicating it operates below its full capacity. Secondary treatment typically involves biological processes such as activated sludge or trickling filters to break down pollutants. The plant is regulated under the National Pollutant Discharge Elimination System (NPDES) permit program, which sets effluent limits to protect water quality. The treated effluent from PRIMGAR STL is discharged into local streams that drain into the Little Sioux River watershed, eventually reaching the Missouri River. This water body supports diverse aquatic life and is used for recreation and agriculture downstream. The plant's operation helps maintain the ecological health of the region's waterways by reducing nutrient and pathogen loads.

PRIMGAR STL discharges into the Little Sioux River basin, which flows into the Missouri River and ultimately the Mississippi River. The receiving waters support a variety of fish and wildlife, including migratory birds and aquatic species. The plant's secondary treatment helps control nutrient pollution, which is important for preventing algal blooms and maintaining oxygen levels in downstream ecosystems.