ST MARKS STP - Advanced Wastewater Treatment in Saint Marks, Florida

ST MARKS STP is a municipal wastewater treatment plant located in Saint Marks, Wakulla County, Florida. The facility serves a small population of 500 residents and is situated in a coastal area near the Gulf of Mexico. The plant provides advanced treatment, ensuring high-quality effluent before discharge. The plant has a designed capacity of 567.81 cubic meters per day and currently treats 189.27 cubic meters daily. As a US facility, it operates under the Clean Water Act and is subject to National Pollutant Discharge Elimination System (NPDES) permits issued by the Florida Department of Environmental Protection. Advanced treatment typically includes nutrient removal, which is critical for protecting sensitive coastal waters. The treated effluent is discharged into local waterways that flow into the Gulf of Mexico. The surrounding watershed supports diverse aquatic life and is part of the larger Apalachicola Bay system, which is ecologically significant for its oyster reefs and estuarine habitats. The plant's advanced treatment helps minimize nutrient loading and protects downstream water quality.

The plant discharges into the St. Marks River watershed, which flows into Apalachicola Bay and ultimately the Gulf of Mexico. This coastal region supports critical estuarine habitats, including seagrass beds and oyster reefs, which are sensitive to nutrient pollution. Advanced treatment at the plant reduces nitrogen and phosphorus loads, helping to maintain the ecological health of the downstream environment.