SEELISBERG Wastewater Treatment Plant, Seelisberg, Uri, Switzerland

The SEELISBERG wastewater treatment plant is located in the municipality of Seelisberg, in the canton of Uri, Switzerland. This facility serves a small population of approximately 1,322 residents, reflecting its role in a rural alpine community. The plant is situated near Lake Lucerne, a major Swiss lake that drains into the Reuss River and ultimately the Rhine. The plant provides secondary treatment, which is the standard biological treatment required under Swiss wastewater regulations. Swiss law mandates that all wastewater treatment plants meet stringent effluent quality standards, with secondary treatment being the minimum for most facilities. The plant's designed capacity of 1,867 m³/day and current discharge volume of 600 m³/day indicate it operates well below its capacity, allowing room for future growth or seasonal variations. The treated effluent from SEELISBERG is discharged into the local watershed, which flows into Lake Lucerne (Vierwaldstättersee). Lake Lucerne is a deep, oligotrophic lake that supports diverse aquatic life and is a vital water resource for the region. The plant's secondary treatment helps protect the lake's water quality by reducing organic pollutants and nutrients, contributing to the ecological health of this important alpine water body.

The SEELISBERG plant discharges into the catchment of Lake Lucerne, which drains via the Reuss River into the Rhine River and ultimately the North Sea. Lake Lucerne is a deep, oligotrophic lake with high water quality, supporting cold-water fish species and providing drinking water for surrounding communities. The plant's secondary treatment helps control nutrient inputs, preventing eutrophication and preserving the lake's ecological balance.