KA Norten Hardenberg Wastewater Treatment Plant, Nörten-Hardenberg, Niedersachsen

KA Norten Hardenberg is a municipal wastewater treatment plant located in Nörten-Hardenberg, in the district of Northeim, Niedersachsen, Germany. The plant serves a population of approximately 16,613 people, classifying it as a medium-sized agglomeration under the EU Urban Waste Water Treatment Directive (91/271/EEC). As a German plant of this scale, it is required to meet secondary treatment standards as a minimum, with tertiary treatment expected if the receiving waters are designated as sensitive areas under the directive. The plant operates within the regulatory framework of the German Water Resources Act (WHG) and the EU directive, ensuring compliance with discharge limits for organic matter, nutrients, and other pollutants. The treated effluent is discharged into the local water system, which ultimately drains into the Leine River, a tributary of the Aller and Weser rivers, flowing towards the North Sea. The plant plays a key role in protecting the water quality of the Leine catchment and downstream ecosystems, including the Weser estuary and the Wadden Sea, a region of high ecological importance.

The plant discharges into the Leine River basin, which flows into the Aller and then the Weser River, eventually reaching the North Sea. The Weser estuary and the Wadden Sea are ecologically sensitive areas supporting diverse aquatic life, including migratory fish and bird populations. The plant's treatment performance is critical to maintaining nutrient and pollutant levels within limits that protect these downstream habitats.