Overview
Castro Cillorigo wastewater treatment plant serves Cillorigo de Liébana, Cantabria, Spain, with a designed capacity of 1.00 m³/day for a population of 2,904. It operates under Spain's national regulations implementing the EU Urban Waste Water Treatme
The Castro Cillorigo wastewater treatment plant is located in Cillorigo de Liébana, a municipality in the autonomous community of Cantabria, northern Spain. The plant serves a population of approximately 2,904 residents, making it a small agglomeration under EU classification. Its designed capacity is 1.00 m³/day, reflecting the scale of the local community. As a Spanish 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 to meet receiving water quality objectives. Spanish regulations mandate secondary treatment or equivalent for inland discharges. The plant discharges into the local watershed within the Cantabrian region, which ultimately drains into the Bay of Biscay (Atlantic Ocean). The receiving water body is likely a small river or stream in the Liébana valley, an area known for its mountainous terrain and ecological value. The treatment plant plays a key role in protecting local water quality and downstream ecosystems.
Environmental context
The plant's discharge enters the Deva River basin, which flows through the Picos de Europa region and eventually reaches the Bay of Biscay near Unquera. This coastal area supports diverse aquatic life and is an important migratory corridor for Atlantic salmon. The treatment plant helps maintain water quality in a region valued for its natural landscapes and tourism.
Frequently asked questions
The plant is located on Carretera León - Unquera in Tama, Cillorigo de Liébana, Cantabria, Spain, with coordinates 43.189° N, -4.606° W.
The plant serves approximately 2,904 residents of Cillorigo de Liébana and surrounding areas.
The treated effluent is discharged into a local watercourse within the Deva River basin, which flows north to the Bay of Biscay.
As a Spanish facility, it operates under the national implementation of the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires appropriate treatment for small agglomerations to protect receiving waters.
For agglomerations under 10,000 population equivalent, Spanish regulations typically require secondary treatment or an equivalent process to meet effluent quality standards, ensuring protection of inland and coastal waters.
Nearby plants