Bregaglia Stampa Wastewater Treatment Plant, Promontogno, Switzerland

Bregaglia Stampa is a municipal wastewater treatment plant located in Promontogno, within the Bregaglia municipality in the canton of Graubünden, Switzerland. The plant serves a small population of 175 residents, reflecting its role in a rural Alpine community. The plant provides secondary treatment, which is the standard biological treatment stage required under Swiss water protection legislation. With a designed capacity of 875 m³/day and an actual discharge volume of 79.44 m³/day, the facility operates well below its capacity, indicating ample headroom for current loads. The treated effluent is discharged into the local water system, which drains into the Maira River and eventually into the Po River basin, reaching the Adriatic Sea. This Alpine watershed supports sensitive aquatic ecosystems, and the plant's secondary treatment helps protect downstream water quality.

The plant discharges into the Maira River, a tributary of the Po River, which flows through northern Italy into the Adriatic Sea. This Alpine watershed is ecologically sensitive, supporting diverse aquatic life including brown trout and other cold-water species. The secondary treatment provided by the plant helps maintain water quality in this important mountain stream.