KA Rehlingen Wastewater Treatment Plant, Fremersdorf, Saarland

KA Rehlingen is a municipal wastewater treatment plant located in Fremersdorf, a district of Rehlingen-Siersburg in the Saarland region of Germany. The plant serves a population of approximately 25,600, classifying it as a medium-sized agglomeration under the EU Urban Waste Water Treatment Directive (UWWTD). It is situated near the Saar River, which flows through the region and ultimately drains into the Moselle and then the Rhine. As a German plant serving over 10,000 people, KA Rehlingen is required to meet secondary treatment standards under the EU UWWTD. Germany implements this directive through its national wastewater regulations, which mandate advanced treatment for sensitive areas. The treated effluent from KA Rehlingen is discharged into the local water system, contributing to the Saar River basin. The Saar River flows through industrial and agricultural areas before joining the Moselle, which eventually reaches the Rhine. The plant plays a key role in protecting the water quality of the Saar and downstream ecosystems, supporting aquatic life and recreational use.

KA Rehlingen discharges into the Saar River, a tributary of the Moselle, which flows into the Rhine. The Saar basin supports diverse aquatic habitats and is used for recreation and fishing. The plant's treatment helps mitigate nutrient loading and pollution, protecting downstream water quality in the Rhine delta and the North Sea.