ZOLFATARA Wastewater Treatment Plant, Fontana Liri, Lazio, Italy

ZOLFATARA is a wastewater treatment plant located in Fontana Liri, in the province of Frosinone, Lazio, Italy. It serves a population of approximately 6,500 people, placing it in the small-to-medium agglomeration category under EU classification. As an Italian plant, ZOLFATARA operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for agglomerations of this scale discharging into freshwater or estuaries. The regulatory framework ensures compliance with national standards for effluent quality. The plant's treated effluent is discharged into the local water system, which ultimately drains into the Tyrrhenian Sea via the Liri River basin. This region supports diverse aquatic life and is part of a sensitive Mediterranean coastal ecosystem. Proper treatment is essential to protect downstream water quality and ecological health.

ZOLFATARA discharges into the Liri River basin, which flows through Lazio and eventually reaches the Tyrrhenian Sea. The downstream environment includes freshwater habitats that support fish and macroinvertebrate communities, as well as coastal marine ecosystems. The plant's location inland, over 50 km from the coast, reduces direct marine impact, but its effluent still influences river water quality and the health of the Liri River's ecological corridor.