Heidelberg POTW - Secondary Wastewater Treatment in Jasper County, Mississippi

Heidelberg POTW is a municipal wastewater treatment plant located in Jasper County, Mississippi, serving a population of approximately 2,172. The facility operates under the regulatory framework of the U.S. Clean Water Act, which requires secondary treatment for municipal plants of this scale. The plant has a designed capacity of 813.86 million gallons per year and currently discharges 685.16 million gallons per year of treated effluent. As a secondary treatment plant, Heidelberg POTW provides biological treatment to remove organic matter and suspended solids, meeting the standard requirements for municipal wastewater in the United States. The plant is regulated under the National Pollutant Discharge Elimination System (NPDES) permit program, administered by the Mississippi Department of Environmental Quality, which sets effluent limits to protect water quality. The treated wastewater from Heidelberg POTW is discharged into local streams that are part of the Pascagoula River basin. The Pascagoula River is one of the last free-flowing river systems in the contiguous United States, supporting diverse aquatic life including several species of freshwater mussels and fish. The river ultimately drains into the Gulf of Mexico, contributing to the nutrient dynamics of the Mississippi Sound.

The plant discharges into tributaries of the Pascagoula River, which flows into the Mississippi Sound and the Gulf of Mexico. The Pascagoula River basin is ecologically significant as one of the largest unimpeded river systems in the lower 48 states, supporting a rich diversity of fish, mussels, and migratory birds. The region's warm, humid climate and forested watershed contribute to seasonal flow variations that influence nutrient processing and aquatic habitat.