Inha Wastewater Treatment Plant, Santa Maria da Feira, Portugal

Inha is a wastewater treatment plant located in Santa Maria da Feira, within the Aveiro district of Portugal. The facility serves a population of approximately 8,700 people, classifying it as a small to medium agglomeration under Portuguese and EU regulations. The plant is situated inland, away from coastal areas, and its operations are part of the region's municipal wastewater infrastructure. As a plant serving under 10,000 population equivalent, Inha operates under the EU Urban Waste Water Treatment Directive 91/271/EEC, which requires appropriate treatment based on the receiving water body's sensitivity. Plants of this scale typically employ secondary biological treatment to meet organic matter and suspended solids removal standards. The designed capacity is noted as 1.00, though the unit is unspecified, indicating the plant's scale relative to its service population. The treated effluent from Inha is discharged into local watercourses that ultimately drain into the Atlantic Ocean via the Douro River basin or nearby coastal lagoons. The region's watershed supports diverse aquatic life and is important for local agriculture and ecosystems. Proper treatment helps protect downstream water quality and ecological health in the Aveiro region.

Inha's treated wastewater flows into local streams that are part of the Douro River basin, eventually reaching the Atlantic Ocean. The receiving waters support diverse aquatic habitats and are used for irrigation and recreation. The plant's inland location reduces direct marine impact, but its discharge contributes to the overall nutrient load in the watershed, requiring effective treatment to prevent eutrophication and protect downstream ecosystems.