Dillenburg _ Donsbach Wastewater Treatment Plant, Donsbach, Hessen, Germany

Dillenburg _ Donsbach is a former wastewater treatment plant located in the Donsbach district of Dillenburg, in the Lahn-Dill-Kreis region of Hessen, Germany. The plant served a population of approximately 1,672 people before its closure. As a small agglomeration, it would have been subject to German wastewater regulations under the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for inland plants of this size. The plant's closure suggests that wastewater from the area is now treated at a different facility or via alternative infrastructure. The region drains into the Dill River, a tributary of the Lahn, which flows into the Rhine River. The Rhine ultimately discharges into the North Sea, making this plant part of a major European watershed.

The plant is located in the Lahn-Dill-Kreis district of Hessen, within the Rhine basin. The Dill River, a tributary of the Lahn, flows through the area and eventually joins the Rhine, which discharges into the North Sea. The region supports diverse aquatic life and is an important corridor for migratory fish. The closure of the plant likely reduces local nutrient and pollutant loads to the Dill River, benefiting downstream water quality.