TERRIL WWTP - Dickinson County, Iowa Wastewater Treatment Plant

TERRIL WWTP is a municipal wastewater treatment facility located in Dickinson County, Iowa, United States. The plant serves a small population of 404 residents and operates under secondary treatment standards, which is the minimum required by the US Clean Water Act for municipal wastewater. The plant's designed capacity is 238.48 million gallons, and it discharges approximately 113.56 million gallons of treated effluent annually. As a secondary treatment plant, TERRIL WWTP uses biological processes to remove organic matter and suspended solids. The plant is subject to National Pollutant Discharge Elimination System (NPDES) permits issued by the Iowa Department of Natural Resources, which set effluent limits to protect water quality. For a plant of this small scale, secondary treatment is typical and sufficient to meet environmental standards. The treated wastewater from TERRIL WWTP is discharged into local waterways that drain into the Missouri River basin, ultimately reaching the Mississippi River and the Gulf of Mexico. The plant's location in rural Iowa means its discharge contributes to the health of small streams and lakes in the region, supporting aquatic life and recreational uses. The surrounding area includes agricultural lands, and the plant plays a key role in preventing nutrient pollution in downstream waters.

The plant discharges into local waterways within the Missouri River basin, which flows into the Mississippi River and eventually the Gulf of Mexico. This watershed supports diverse aquatic ecosystems and is important for migratory birds and fish. The region's agricultural landscape means that nutrient management from wastewater is critical to prevent algal blooms and hypoxia in downstream waters.