GROIX Locmaria Wastewater Treatment Plant, Groix, Brittany

GROIX Locmaria is a municipal wastewater treatment plant located in Locmaria, on the island of Groix in the Morbihan department of Brittany, France. The plant serves a population of 1,257 and is operated as part of the region's wastewater infrastructure for small coastal communities. The plant provides secondary treatment, which is the standard required under the EU Urban Waste Water Treatment Directive (91/271/EEC) for discharges into coastal waters from agglomerations of this size. The plant has a designed capacity of 2,000 m³/day and currently treats an average of 224.25 m³/day, indicating ample reserve capacity. The treated effluent is discharged into the coastal waters of the Bay of Biscay, a productive marine ecosystem that supports diverse fish and bird populations. The plant's location within 10 km of the coast means its discharge is subject to stringent environmental monitoring to protect the sensitive marine environment.

The plant discharges into the coastal waters of the Bay of Biscay, which is part of the North Atlantic Ocean. This area supports diverse marine life, including seabird colonies and fish stocks, and is an important migratory corridor for marine species. The island of Groix is known for its rocky shores and rich intertidal habitats, which benefit from well-treated effluent to maintain water quality.