KA KASTEL Wastewater Treatment Plant, Nonnweiler, Saarland, Germany

KA KASTEL is a municipal wastewater treatment plant located in the Kastel district of Nonnweiler, in the Saarland region of Germany. The plant serves a population of approximately 8,200 people, classifying it as a small to medium agglomeration under EU regulations. As a German plant, KA KASTEL operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for agglomerations of this size. The directive also mandates more stringent treatment if the receiving waters are designated as sensitive areas, which is common in the Saarland region due to its river systems. The plant discharges treated effluent into local watercourses that ultimately drain into the Saar River, a tributary of the Moselle, which flows into the Rhine and then the North Sea. The surrounding area is characterized by forested hills and agricultural land, making the protection of water quality important for both ecological and recreational uses.

The treated effluent from KA KASTEL enters local streams that feed into the Prims River, a tributary of the Saar River. The Saar flows into the Moselle, which joins the Rhine and eventually reaches the North Sea. The watershed supports diverse aquatic life, including fish species such as trout and grayling, and the region is known for its high water quality standards under the EU Water Framework Directive.