Hyllingeriis Wastewater Treatment Plant, Skibby, Denmark

Hyllingeriis is a wastewater treatment plant located in Skibby, within the Frederikssund Municipality of Region Hovedstaden, Denmark. The plant serves a population of approximately 2,618 people and has a designed capacity of 1.00 unit, indicating it is a small-scale facility typical of rural communities in the region. As a Danish plant, it operates under the European Union's Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for agglomerations of this size. Denmark implements this directive through national legislation enforced by the Danish Environmental Protection Agency, ensuring compliance with discharge standards. The plant's treated effluent likely discharges into local watercourses that drain into the Roskilde Fjord or the Isefjord system, ultimately reaching the Kattegat and the Baltic Sea. These coastal waters are ecologically sensitive, supporting diverse marine life and serving as important habitats for fish and bird species.

The plant is located within 50 km of the coast, and its discharge likely flows into the Roskilde Fjord or Isefjord, which are part of the Kattegat basin. These waters support diverse aquatic life, including fish spawning grounds and migratory bird habitats, and are influenced by both freshwater inputs and marine conditions.