Albula_Alvra Surava Wastewater Treatment Plant, Graubünden, Switzerland

Albula_Alvra Surava is a municipal wastewater treatment plant located in the village of Surava, part of the Albula/Alvra municipality in the canton of Graubünden, Switzerland. It serves a small population of 613 residents, reflecting the rural and alpine character of the region. The plant provides secondary treatment, which is the standard biological treatment level required under Swiss water protection legislation. With a designed capacity of 750 m³/day and a current discharge volume of 278.25 m³/day, the facility operates well below its capacity, indicating adequate headroom for future growth or seasonal variations. The treated effluent is discharged into the local watershed, which ultimately drains into the Albula River, a tributary of the Rhine. This river system flows through the Swiss Alps and into Lake Constance before reaching the North Sea. The plant plays a key role in protecting the sensitive alpine aquatic environment from nutrient pollution.

The plant discharges into the Albula River, which flows into the Hinterrhein and then the Rhine, eventually reaching the North Sea. The alpine watershed is ecologically sensitive, supporting diverse aquatic life including brown trout and other cold-water species. The region's steep terrain and fast-flowing rivers require effective treatment to prevent nutrient enrichment and maintain water quality in downstream lakes and rivers.