Plougasnou Kerallas Wastewater Treatment Plant, Brittany, France

Plougasnou Kerallas is a wastewater treatment plant located in the commune of Plougasnou, in the Finistère department of Brittany, France. The plant serves a population of approximately 2,560 residents, classifying it as a small agglomeration under French and EU regulations. It is situated near the coast, within 10 km of the English Channel. The plant employs advanced treatment processes, which go beyond the secondary treatment standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for sensitive areas. With a designed capacity of 6,300 m³/day and an actual discharge volume of 456.70 m³/day, the facility operates well below its capacity, indicating room for future growth or seasonal fluctuations. The plant is part of France's national wastewater infrastructure, regulated by the French Ministry of Ecology and local water agencies. The treated effluent is discharged into the local watershed, which drains into the English Channel via small coastal rivers. The receiving waters support diverse marine life and are part of the broader Iroise Sea ecosystem. The advanced treatment level helps protect the sensitive coastal environment from nutrient pollution and pathogens, contributing to the ecological health of the region.

The plant discharges into the coastal watershed of northern Finistère, which flows into the English Channel. This area is ecologically sensitive, supporting diverse marine habitats and migratory fish species. The advanced treatment helps minimize nutrient loading and protects the coastal water quality, which is important for local fisheries and tourism.