Holly Hill STP Wastewater Treatment Plant, Holly Hill, Florida

Holly Hill STP is a municipal wastewater treatment facility located at 946 Riverside Drive in Holly Hill, Volusia County, Florida. It serves a population of approximately 11,700 people, placing it in the small-to-medium agglomeration category for U.S. plants. The facility is situated near the Halifax River, a coastal estuary that forms part of the larger Indian River Lagoon system. As a U.S. wastewater plant, Holly Hill STP 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. For plants serving around 12,000 people, secondary treatment is the federal minimum standard, though more advanced treatment may be required to protect sensitive coastal waters. The designed capacity is 1.00 million gallons per day, indicating the plant's scale relative to its service population. The plant's treated effluent discharges into the Halifax River, which flows into the Atlantic Ocean via Ponce de Leon Inlet. This coastal watershed supports diverse marine life, including seagrass beds and estuarine fisheries. The Indian River Lagoon is one of the most biodiverse estuaries in North America, making nutrient management critical to prevent algal blooms and habitat degradation.

Holly Hill STP discharges into the Halifax River, a tidal estuary that connects to the Atlantic Ocean through Ponce de Leon Inlet. The receiving waters are part of the Indian River Lagoon system, a biologically rich estuary that supports seagrass meadows, mangroves, and a wide variety of fish and bird species. The lagoon is ecologically sensitive to nutrient loading, which can trigger harmful algal blooms and oxygen depletion. Effective wastewater treatment is essential to protect this estuarine environment and the downstream coastal ecosystem.