1550102006 KA Reyershausen Wastewater Treatment Plant, Nörten-Hardenberg, Germany

1550102006 KA Reyershausen is a former wastewater treatment plant located in Nörten-Hardenberg, in the district of Northeim, Niedersachsen, Germany. The plant served a small agglomeration of 2,133 people and was designed with a capacity of 3,300 m³/day, indicating it was sized for modest community needs. The plant provided advanced treatment, which goes beyond secondary treatment to remove nutrients such as nitrogen and phosphorus. As a German facility, it operated under the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires advanced treatment for discharges into sensitive areas. The plant is now closed, and its wastewater management responsibilities have likely been transferred to a neighboring facility. The plant's discharge would have entered local watercourses in the Leine river basin, which flows northward through Niedersachsen. The Leine ultimately joins the Aller and then the Weser, draining into the North Sea. The region's aquatic ecosystems benefit from advanced treatment that reduces eutrophication risks downstream.

The plant was situated in the Leine river basin, a tributary of the Aller and Weser rivers, which flow to the North Sea. The Leine supports diverse freshwater habitats and is an important corridor for migratory fish. Advanced treatment at this plant would have helped protect water quality in the sensitive North Sea coastal zone by limiting nutrient inputs.