Le Strette Wastewater Treatment Plant, Villa Santo Stefano, Lazio, Italy

Le Strette is a wastewater treatment plant located in Villa Santo Stefano, a town in the province of Frosinone, Lazio, Italy. The plant serves a small population of approximately 700 residents, reflecting its role in a rural or small-town setting within the Italian wastewater infrastructure. The plant employs advanced treatment processes, which go beyond the secondary treatment required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. With a designed capacity of 800 cubic meters per day and a discharge volume of about 138.58 cubic meters per day, the plant operates well below its capacity, indicating potential for future growth or seasonal variations. The treated effluent is discharged into the local watershed, which ultimately drains into the Tyrrhenian Sea via the Liri-Garigliano river system. The plant's advanced treatment helps protect the sensitive aquatic ecosystems of the region, including downstream rivers and coastal areas, by reducing nutrient loads and pollutants.

The plant discharges into the Liri-Garigliano river basin, which flows through Lazio and Campania before reaching the Tyrrhenian Sea. This coastal area supports diverse marine life and is important for local fisheries and tourism. Advanced treatment at Le Strette helps minimize eutrophication risks in the downstream river and coastal waters, preserving ecological balance.