Meservey STL Wastewater Treatment Plant - Meservey, Iowa

Meservey STL is a municipal wastewater treatment plant located at 1258 Cardinal Avenue in Meservey, Cerro Gordo County, Iowa. The plant serves a small population of 256 residents, reflecting the rural character of the community. As a secondary treatment facility, it provides biological treatment to reduce organic pollutants and suspended solids before discharge. The plant has a designed capacity of 105.99 cubic meters per day and currently treats an average daily flow of 94.64 cubic meters. Under the US Clean Water Act, facilities of this scale are typically regulated through the National Pollutant Discharge Elimination System (NPDES) permit program, administered by the Iowa Department of Natural Resources. Secondary treatment is the minimum standard for municipal wastewater plants in the United States. The treated effluent is discharged into local waterways that drain into the Iowa River basin, ultimately reaching the Mississippi River. The plant plays a key role in protecting downstream water quality in the agricultural landscape of north-central Iowa, helping to reduce nutrient loading and maintain aquatic habitat in the region's streams and rivers.

The plant discharges into tributaries of the Iowa River, which flows southeast to join the Mississippi River. The receiving waters support diverse aquatic life and are part of a watershed dominated by row-crop agriculture. Nutrient management is a key concern in this region, as excess nitrogen and phosphorus can contribute to algal blooms and hypoxia in the Gulf of Mexico. The plant's secondary treatment helps mitigate these impacts by reducing organic and nutrient loads.