ARA LIESBERG Wastewater Treatment Plant, Liesberg, Basel-Landschaft

ARA LIESBERG is a municipal wastewater treatment plant located in Liesberg, within the Basel-Landschaft canton of Switzerland. The facility serves a population of 1,257 and is designed to handle up to 2,100 m³/day, with an average discharge volume of 570.58 m³/day. The plant provides secondary treatment, which is the standard level required under Swiss water protection legislation. Switzerland's Waters Protection Act (Gewässerschutzgesetz) mandates that all wastewater undergo appropriate treatment to prevent pollution of water bodies. For small agglomerations like Liesberg, secondary treatment is typically sufficient to meet stringent effluent quality standards. The treated effluent is discharged into the local watershed, which ultimately drains into the Rhine River via the Birs River. The Rhine is a major European waterway that flows through Switzerland, Germany, and the Netherlands before reaching the North Sea. The plant's operations help protect the ecological health of the Birs and Rhine rivers, supporting aquatic life and downstream water quality.

The plant discharges into the Birs River, a tributary of the Rhine River. The Rhine basin is ecologically significant, supporting diverse fish species such as salmon and trout, and serving as a vital corridor for migratory birds. The plant's secondary treatment helps reduce nutrient loads and organic pollutants, protecting the river's water quality and the downstream ecosystems of the Rhine and North Sea.