Pfafers Vattis Wastewater Treatment Plant, Vättis, St. Gallen, Switzerland

Pfafers Vattis is a wastewater treatment plant located in the village of Vättis, within the municipality of Pfäfers in the canton of St. Gallen, Switzerland. It serves a small population of 748 residents, reflecting its role in a rural alpine community. The plant is situated in the Sarganserland region, near the Tamina River valley. The plant provides secondary treatment, which is the standard biological treatment required under Swiss water protection regulations. With a designed capacity of 1,250 m³/day and an average discharge volume of 339.53 m³/day, the facility operates well below its capacity, indicating room for future growth or seasonal variations. Swiss wastewater treatment plants are regulated by the Federal Water Protection Act (Gewässerschutzgesetz), which mandates stringent effluent standards to protect sensitive alpine water bodies. The treated effluent is discharged into local watercourses that eventually flow into the Tamina River, a tributary of the Rhine. The Rhine ultimately drains into the North Sea. The plant's location in a mountainous region means the receiving waters are ecologically sensitive, supporting diverse aquatic life and contributing to the overall health of the Rhine basin.

The plant discharges into local streams that feed the Tamina River, which joins the Rhine near Bad Ragaz. The Rhine flows through Switzerland, Germany, and the Netherlands before reaching the North Sea. The alpine watershed is ecologically sensitive, supporting cold-water fish species and pristine aquatic habitats. The plant's secondary treatment helps protect downstream water quality in this important European river system.