San Marco in Lamis Vecchio Wastewater Treatment Plant, Puglia, Italy

San Marco in Lamis Vecchio is a former wastewater treatment plant located in San Marco in Lamis, a town in the province of Foggia, Puglia, Italy. The plant served the local community and was designed with a capacity of 10,937 cubic meters per day, reflecting the scale of the agglomeration it supported. The plant provided secondary treatment, which is the standard biological treatment required under the EU Urban Waste Water Treatment Directive (91/271/EEC) for inland discharges. For agglomerations of this size, secondary treatment is typically sufficient to meet regulatory standards for organic matter and suspended solids removal. Although the plant is now closed, its operations historically contributed to protecting the local watershed. The treated effluent would have been discharged into a receiving water body within the Puglia region, ultimately draining into the Adriatic Sea. Proper treatment helps safeguard downstream ecosystems and supports water quality in the sensitive Mediterranean coastal environment.

The plant is located inland in the Puglia region, more than 10 km from the coast but within 50 km of the Adriatic Sea. The local watershed drains into the Adriatic, a semi-enclosed sea with limited water exchange, making it sensitive to nutrient pollution. The plant's secondary treatment would have helped reduce organic load and protect downstream aquatic habitats, including coastal zones that support diverse marine life and fisheries.