ARA BURG Wastewater Treatment Plant, Burg im Leimental, Basel-Landschaft

ARA BURG is a municipal wastewater treatment plant located in Burg im Leimental, a village in the canton of Basel-Landschaft, Switzerland. The plant serves a small population of 128 residents, reflecting its role in a rural community within the Jura region near the French border. The facility provides secondary treatment, which is the standard biological treatment level required under Swiss water protection regulations. With a designed capacity of 300 m³/day and an actual discharge volume of 58.10 m³/day, the plant operates well below its capacity, indicating room for future growth or seasonal variations. The treated effluent is discharged into local watercourses that ultimately drain into the Rhine River basin. Switzerland's strict water protection laws ensure that even small plants like ARA BURG maintain high treatment standards to protect downstream ecosystems, including the Rhine and its tributaries.

The plant's discharge enters small streams in the Leimental valley, which flow into the Birsig River and eventually the Rhine River near Basel. The Rhine is a major European waterway supporting diverse aquatic life and providing drinking water for millions. The region's karst geology means groundwater protection is critical, and the plant's secondary treatment helps prevent nutrient pollution that could harm sensitive downstream habitats.