Nesbyen avlopsanlegg - Wastewater Treatment Plant in Nesbyen, Buskerud, Norway

Nesbyen avlopsanlegg is a municipal wastewater treatment facility located in Nesbyen, Buskerud, Norway. The plant serves a population of around 4,500 residents, making it a small to medium-sized agglomeration under Norwegian regulations. As a Norwegian plant, it operates under the national implementation of the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for agglomerations of this size. The facility is expected to meet the regulatory standards for biological treatment and nutrient removal where necessary. The plant discharges treated wastewater into the local watercourse, which is part of the Hallingdal watershed. This area drains into the Hallingdalselva river, eventually reaching the Drammensfjord and the Oslofjord. The plant plays a key role in protecting the downstream aquatic environment from pollution, supporting water quality for both ecological and recreational uses.

The plant's discharge enters the Hallingdal watershed, flowing into the Hallingdalselva river, which is a tributary of the Drammenselva river. This river system ultimately drains into the Drammensfjord, an arm of the Oslofjord. The downstream environment supports diverse aquatic life, including salmonid fish populations, and is important for local biodiversity and water quality.