Sant Joan les Fonts Wastewater Treatment Plant: Serving Sant Joan les Fonts, Catalunya

The Sant Joan les Fonts wastewater treatment plant is located in the municipality of Sant Joan les Fonts, within the Garrotxa comarca of Girona, Catalunya, Spain. The facility serves a population of approximately 5,954 people, classifying it as a small to medium agglomeration under European Union classification. The plant is situated in an industrial area, Polígon industrial Les Coromines, and plays a key role in managing local wastewater. As a Spanish wastewater facility, the plant operates under the national transposition of the EU Urban Waste Water Treatment Directive (91/271/EEC). For agglomerations of this size (under 10,000 population equivalent), the directive requires appropriate treatment, typically secondary treatment, to ensure compliance with environmental standards. The regulatory framework ensures that discharge standards are met. The treated effluent from the plant is discharged into the local water system, which ultimately drains into the Fluvià River basin. The Fluvià River flows through the Garrotxa region and into the Mediterranean Sea near the Gulf of Roses. This watershed supports diverse aquatic life and is part of a region known for its volcanic landscapes and natural parks, making proper wastewater treatment essential for preserving local water quality and downstream ecosystems.

The plant discharges into the Fluvià River basin, which flows through the Garrotxa region and empties into the Mediterranean Sea at the Gulf of Roses. This watershed supports diverse aquatic life, including fish species such as the Mediterranean barbel and the European eel. The area is ecologically sensitive due to its volcanic terrain and proximity to natural protected zones, making effective wastewater treatment critical for maintaining water quality and biodiversity in the river and coastal waters.