STEP FAHY Wastewater Treatment Plant, Fahy, Jura, Switzerland

STEP FAHY is a municipal wastewater treatment plant located in Fahy, a small village in the Jura canton of Switzerland. The plant serves a population of 242 and operates with a designed capacity of 567 cubic meters per day, reflecting the scale of this rural agglomeration. As a secondary treatment facility, STEP FAHY provides biological treatment to remove organic matter and suspended solids. Under Swiss water protection law (Gewässerschutzgesetz), plants of this size are required to meet stringent effluent standards to protect receiving waters. The plant's discharge volume is 109.85 m³/day, indicating a utilization rate well below capacity. The treated effluent is discharged into local watercourses that drain into the Allaine River, a tributary of the Doubs River, which eventually flows into the Saône and Rhône rivers. This watershed supports diverse aquatic life and contributes to the ecological health of the Rhône basin, a major European river system.

The plant discharges into the Allaine River, a tributary of the Doubs River, which flows into the Saône and ultimately the Rhône River. The Rhône basin is ecologically significant, supporting diverse fish species and migratory birds. The Jura region's karst landscape makes groundwater protection critical, and the plant's secondary treatment helps reduce nutrient loading to downstream waters.