SAN GIOVANNI Wastewater Treatment Plant, Piglio, Lazio, Italy

SAN GIOVANNI is a wastewater treatment plant located in Piglio, a town in the Lazio region of central Italy. The facility serves a population of approximately 3,100 residents and is situated along Via Prenestina in the province of Frosinone. As an advanced treatment plant, it provides a high level of pollutant removal, ensuring compliance with stringent environmental standards. The plant has a designed capacity of 5,000 cubic meters per day and currently discharges an average of 613.69 cubic meters per day, indicating significant spare capacity. Under the EU Urban Waste Water Treatment Directive (91/271/EEC), plants serving agglomerations of this size are required to provide secondary treatment, but SAN GIOVANNI exceeds this requirement with advanced treatment. The facility operates within Italy's national regulatory framework, which implements the directive through Decreto Legislativo 152/2006. The treated effluent is discharged into the local water system, ultimately flowing into the Tiber River basin and reaching the Tyrrhenian Sea. The plant plays a key role in protecting the water quality of the region's streams and groundwater, supporting both ecological health and downstream uses such as agriculture and recreation.

The plant discharges into the Tiber River basin, which drains into the Tyrrhenian Sea near Rome. The Tiber is the third-longest river in Italy and supports diverse aquatic life, including fish species such as barbel and chub. The downstream environment includes the Tiber Delta, an ecologically sensitive area with wetlands and coastal lagoons that provide habitat for migratory birds. Advanced treatment at SAN GIOVANNI helps reduce nutrient and pollutant loads, protecting these downstream ecosystems.