Bellelay Wastewater Treatment Plant, Saicourt, Switzerland

Bellelay wastewater treatment plant is located in Saicourt, within the Bern/Jura bernois region of Switzerland. The facility serves a population of 880 and employs advanced treatment processes, reflecting Switzerland's high standards for water quality protection. As an advanced treatment facility, it goes beyond secondary treatment to remove nutrients and other pollutants, aligning with Swiss federal water protection ordinances that require stringent effluent quality for sensitive receiving waters. The treated effluent from Bellelay ultimately drains into the local watershed, contributing to the Rhine basin via the Birs river system. The region's aquatic ecosystems benefit from the plant's advanced treatment, which helps maintain water quality in streams and rivers that support diverse aquatic life and serve as important corridors for migratory fish.

Bellelay's treated wastewater flows into local streams that are part of the Birs river catchment, which eventually joins the Rhine River near Basel. The Rhine is a major European waterway that drains into the North Sea. The surrounding Jura region features karst landscapes and sensitive groundwater systems, making advanced treatment crucial for protecting both surface waters and underground aquifers that support local biodiversity and drinking water supplies.