Colmberg Wastewater Treatment Plant, Bavaria, Germany

The Colmberg wastewater treatment plant is located in the town of Colmberg, in the Landkreis Ansbach district of Bavaria, Germany. It serves a population of approximately 2,480 residents, classifying it as a small agglomeration under EU regulations. As a secondary treatment facility, the plant provides biological treatment to remove organic matter and suspended solids. The plant has a designed capacity of 3,100 cubic meters per day and discharges a daily volume of about 628 cubic meters. Under the EU Urban Waste Water Treatment Directive (91/271/EEC), secondary treatment is the standard requirement for inland freshwater discharges from agglomerations of this size. The treated effluent is discharged into local watercourses that ultimately drain into the Main River basin, part of the larger Rhine River watershed. The receiving waters support aquatic life and are used for agricultural and recreational purposes downstream. The plant's operation helps protect the local environment from nutrient pollution and organic loading.

The plant discharges into small streams that flow into the Altmühl River, a tributary of the Danube River system. The Altmühl River is an ecologically sensitive watercourse that supports diverse aquatic life, including fish species such as grayling and brown trout. The plant's secondary treatment reduces organic pollutants and helps maintain water quality in this important regional watershed.