Quattro Castella Le Forche Wastewater Treatment Plant, Puianello, Italy

The Quattro Castella Le Forche wastewater treatment plant is located in Puianello, a frazione of Quattro Castella in the Emilia-Romagna region of northern Italy. The plant serves a population of approximately 12,239 people, placing it in the medium agglomeration category under EU classification. As an Italian wastewater facility, the plant operates under the EU Urban Waste Water Treatment Directive 91/271/EEC, which requires secondary treatment for agglomerations of this size discharging into inland waters. The directive also mandates more stringent treatment if the receiving waters are designated as sensitive areas, which is common in the Po River basin. The plant's treated effluent likely discharges into a tributary of the Po River, which flows eastward into the Adriatic Sea. The Po basin is a densely populated and agriculturally intensive region, making effective wastewater treatment critical for protecting water quality and aquatic ecosystems downstream.

The plant is situated inland in the Po River basin, one of Italy's most important watersheds. The Po River drains the entire northern Italian plain and discharges into the Adriatic Sea near Venice. The basin supports diverse aquatic life and is a vital resource for agriculture and drinking water. Effective treatment at this plant helps reduce nutrient loads and pollutants that could otherwise contribute to eutrophication in the Adriatic coastal zone.