ARA HERSBERG Wastewater Treatment Plant, Hersberg, Basel-Landschaft

ARA HERSBERG is a municipal wastewater treatment plant located in the village of Hersberg, within the Bezirk Liestal district of Basel-Landschaft, Switzerland. Serving a small population of 142 residents, the plant is designed for a capacity of 333 m³/day and currently treats an average of 64.46 m³/day of wastewater. The plant provides secondary treatment, which is the standard biological treatment stage required under Swiss water protection regulations. For small agglomerations like Hersberg, secondary treatment ensures effective removal of organic matter and suspended solids, meeting the national standards for discharge into surface waters. The treated effluent from ARA HERSBERG is discharged into local streams that drain into the Rhine River basin. The Rhine is a major European waterway flowing through Switzerland, Germany, and the Netherlands before reaching the North Sea. The plant's operation helps protect the ecological health of these downstream waters, supporting aquatic life and water quality in the region.

The plant discharges into small streams within the Rhine River basin, which ultimately flows through Germany and the Netherlands into the North Sea. The local watershed supports diverse aquatic ecosystems, including fish species such as brown trout and grayling, and the plant's secondary treatment helps maintain water quality in this ecologically sensitive area.