EPENDES Wastewater Treatment Plant, Ependes (VD), Vaud, Switzerland

EPENDES is an advanced wastewater treatment plant located in Ependes (VD), in the canton of Vaud, Switzerland. It serves a small population of 913 residents, reflecting its role in a rural or peri-urban community within the Jura-Nord vaudois district. The plant's designed capacity of 1525 m³/day indicates it is sized to handle peak flows, while current discharge volume is 414.43 m³/day, suggesting operational headroom. As an advanced treatment facility, EPENDES goes beyond secondary treatment to remove nutrients such as nitrogen and phosphorus, a standard requirement in Switzerland under the Swiss Water Protection Act (Gewässerschutzgesetz). This level of treatment is typical for plants discharging into sensitive water bodies, even for small agglomerations. The plant operates within Switzerland's stringent federal water protection framework, which mandates advanced treatment for all plants in catchment areas of lakes and rivers to prevent eutrophication. The treated effluent from EPENDES ultimately drains into the local river system, which flows into Lake Neuchâtel, one of the largest lakes in Switzerland. Lake Neuchâtel is part of the Rhine basin and supports diverse aquatic life, including fish species like perch and pike. The advanced treatment ensures minimal nutrient loading, protecting the lake's ecological balance and recreational value.

EPENDES discharges into local waterways that feed into the Orbe River, a tributary of the Thièle River, which flows into Lake Neuchâtel. Lake Neuchâtel is a large, deep lake in western Switzerland, part of the Rhine basin via the Aare River. The lake supports a rich ecosystem, including fish populations and migratory birds. Advanced treatment at EPENDES helps prevent eutrophication and maintains water quality for downstream communities and habitats.