CAYEUX SUR MER Wastewater Treatment Plant, Cayeux-sur-Mer, Hauts-de-France

The CAYEUX SUR MER wastewater treatment plant is located in Cayeux-sur-Mer, a coastal commune in the Hauts-de-France region of northern France. The facility serves a population of approximately 4,057 residents and operates under the regulatory framework of the European Union's Urban Waste Water Treatment Directive (91/271/EEC). As a secondary treatment plant, it provides biological treatment to reduce organic matter and suspended solids before discharge. Under the EU UWWTD, agglomerations with a population equivalent (PE) between 2,000 and 10,000 are generally required to have secondary treatment. With a population served of 4,057, this plant meets the directive's standards for its size class. The plant has a designed capacity of 6,033 cubic meters per day and an average discharge volume of 723.76 cubic meters per day, indicating it operates well below its capacity. The plant's treated effluent is discharged into the local environment, ultimately reaching the English Channel via coastal waters. The Somme estuary and nearby coastal areas are ecologically sensitive, supporting diverse marine life and migratory bird populations. The plant's coastal location necessitates careful management to protect the marine environment from nutrient pollution and other impacts.

The plant discharges into the English Channel via local coastal waters. The Somme Bay, a nearby estuary, is an important ecological area for migratory birds and marine biodiversity. The coastal waters support fisheries and tourism, making nutrient management critical to prevent eutrophication.