GROTTERIA_CATALISANO Wastewater Treatment Plant, Oppido Mamertina, Calabria

GROTTERIA_CATALISANO is a municipal wastewater treatment plant located in Piminoro, near Oppido Mamertina, in the Calabria region of southern Italy. The plant serves a population of approximately 3,206 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. With a designed capacity of 2,500 m³/day and a reported discharge volume of 634.67 m³/day, the plant operates well below its capacity, indicating potential for future growth or seasonal variability. The treated effluent is discharged into local watercourses that ultimately drain into the Ionian Sea. The receiving waters support diverse aquatic life and are part of the broader Mediterranean coastal ecosystem. The plant's location more than 10 km from the coast reduces direct marine impact, but its discharge contributes to the health of inland streams and downstream environments.

The plant discharges into local streams that flow toward the Ionian Sea, a key Mediterranean basin. The watershed supports diverse aquatic habitats and is important for regional biodiversity. While not directly coastal, the plant's effluent influences downstream water quality in a region characterized by mountainous terrain and seasonal rainfall patterns.