Hilliard STP - Advanced Wastewater Treatment in Hilliard, Florida

Hilliard STP is an advanced wastewater treatment facility located in Hilliard, Nassau County, Florida. The plant serves a population of 1,555 and operates as part of the municipal wastewater infrastructure for the community. The plant provides advanced treatment, which goes beyond secondary treatment to remove additional nutrients and contaminants. With a designed capacity of 1,211.33 m³/day and an average discharge volume of 757.08 m³/day, the facility operates under the U.S. Clean Water Act, which requires NPDES permits for all discharges to surface waters. Advanced treatment is typical for plants discharging to sensitive water bodies or where nutrient reduction is required. The treated effluent is discharged into the local watershed, which drains to the St. Marys River and ultimately the Atlantic Ocean. The plant's advanced treatment helps protect downstream aquatic ecosystems, including estuarine habitats near the coast.

The plant discharges into the St. Marys River basin, which flows northeast to the Atlantic Ocean near the Florida-Georgia border. This coastal river system supports diverse aquatic life, including migratory fish and estuarine species. The advanced treatment reduces nutrient loading, helping to prevent eutrophication in downstream estuaries and coastal waters.