Les Pieux Wastewater Treatment Plant - Normandy, France

The Les Pieux wastewater treatment plant is located in the commune of Les Pieux in the Manche department of Normandy, France. It serves a population of 4,260 and operates under secondary treatment, which is the standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. The plant has a designed capacity of 5,000 cubic meters per day and discharges approximately 760 cubic meters of treated effluent daily. As a facility in the European Union, Les Pieux must comply with the EU Urban Waste Water Treatment Directive, which mandates secondary treatment for all discharges from agglomerations with a population equivalent (PE) between 2,000 and 10,000. The directive also requires more stringent treatment if the receiving waters are designated as sensitive areas. The plant's secondary treatment process typically involves biological treatment to reduce organic matter and suspended solids. The plant is situated less than 10 kilometers from the coast, discharging into the English Channel. The local watershed includes small coastal streams that drain the Normandy countryside. The discharge contributes to the nutrient load in the coastal waters, which can affect marine ecosystems. The English Channel is a dynamic marine environment with strong tidal currents, supporting diverse marine life and important fisheries.

The plant discharges treated wastewater into the English Channel via local coastal streams. The English Channel is a major marine ecosystem supporting diverse species including seabirds, fish, and marine mammals. The area is influenced by strong tidal flows that help disperse effluent. The watershed includes agricultural land, which combined with wastewater discharge, can contribute to nutrient enrichment in coastal waters. The plant's location within 10 km of the coast means its discharge has a direct impact on the marine environment.