Toho IV Poinciana System WRF - Poinciana, Florida Wastewater Treatment Plant

Toho IV Poinciana System WRF is a wastewater treatment facility located in Poinciana, Osceola County, Florida. The plant serves an estimated population of 47,500 residents, placing it in the medium-agglomeration category for U.S. municipal wastewater systems. As a U.S. facility, the plant operates under the Clean Water Act's National Pollutant Discharge Elimination System (NPDES) permit program, administered by the Florida Department of Environmental Protection. For a plant of this scale, secondary treatment is typically required, with possible additional nutrient removal standards due to Florida's sensitive aquatic ecosystems. The plant's treated effluent is discharged into local waterways that ultimately drain into the Everglades ecosystem and Florida Bay. The region's flat topography and high water table make groundwater protection a key concern, with strict limits on nitrogen and phosphorus to prevent algal blooms in downstream lakes and estuaries.

The plant discharges into the Kissimmee River basin, which flows south into Lake Okeechobee and then into the Everglades, a vast subtropical wetland that supports diverse aquatic life and serves as a critical migratory corridor. The region's slow-moving waters and warm climate make it susceptible to nutrient enrichment, so effective treatment is essential to protect downstream ecosystems.