IDL_RIBOLLA Wastewater Treatment Plant, Ribolla, Toscana, Italy

IDL_RIBOLLA is a municipal wastewater treatment plant located in Ribolla, a frazione of Roccastrada in the province of Grosseto, Toscana, Italy. The plant serves a population of approximately 2,115 people, classifying it as a small agglomeration under Italian and EU regulations. The plant provides secondary treatment, which is the minimum standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for freshwater discharges from agglomerations of this size. The designed capacity is 2,500 m³/day, and the reported discharge volume is 418.70 m³/day, indicating operational headroom. Treated effluent is discharged into the local water system, which ultimately drains into the Tyrrhenian Sea via the Ombrone River basin. The plant plays a key role in protecting the water quality of the surrounding agricultural and natural areas, including the Maremma region, which supports diverse aquatic and bird life.

The plant discharges into the Ombrone River basin, which flows through the Maremma region of Tuscany and empties into the Tyrrhenian Sea. This coastal watershed supports important wetland ecosystems and agricultural activities. The secondary treatment provided helps reduce organic pollutants and nutrients, protecting downstream water quality and the sensitive coastal environment.