The 2,357 urban wastewater treatment plants that Spain reports to the European Union. Each one links to Google Maps and Google Earth, so you can see it from the air.
Source: European Environment Agency · Waterbase-UWWTD, 2023 call (public final version) · water.europa.eu
Data reported to the EU (Waterbase-UWWTD 2023). This visualisation does not assess or diagnose the actual performance of any installation: it only reflects what is declared in the official source.
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This page does not ask you to take its word. Everything comes from a single public file of the European Environment Agency, and the figure is recalculated in five minutes:
Keep the Spanish plants: repCode starting with ES. There are 2.357.
Discard those in which either figure is missing or is zero. That leaves 2.168 assessable.
Count how many have uwwLoadEnteringUWWTP > uwwCapacity. The count is 229.
The definitions of both fields are in the Eionet data dictionary, en inglés: uwwCapacity, Organic design capacity (p.e.) of the waste water treatment plant (capacidad orgánica de diseño de la planta, en habitantes equivalentes), y uwwLoadEnteringUWWTP, Load entering UWWTP (p.e.) (carga entrante en la planta, en habitantes equivalentes). Las traducciones entre paréntesis son nuestras. Comparten unidad: la comparación es la que ambos campos existen para permitir.
Hash of the file used, downloaded on 5 September 2026, so you can confirm you are working with the same data: SHA-256 4f5e45a97d210652ef108b017c2c10cf387cc8305a331c778cbf5d3f1b068a61
Primary onlySecondary (biological)TertiaryDeclared load above declared capacityPoint size is proportional to plant capacity