Barcelona City Hall’s façade will be illuminated in blue on Sunday evening to mark World Water Day, an annual UN observance held to highlight the importance of fresh water. The celebration comes as Catalonia’s reservoirs, once perilously low, have seen a dramatic recovery, prompting a shift in focus from immediate crisis to long-term resilience.

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The visual gesture at the Ajuntament de Barcelona from 7:30 PM symbolises a profound turnaround for the region. According to data from the Catalan Water Agency (ACA), Catalonia’s internal basin reservoirs now stand at 92.5% of their capacity. This starkly contrasts the situation two years ago, when a severe hydraulic drought gripped the region, making “Water doesn’t fall from the sky” a common refrain.

At the height of the drought, images of the depleted Sau Reservoir, with its historic church steeple emerging from dry, cracked earth, was a potent symbol of the water crisis. Now, betevé reports a “completely different” situation.

From Scarcity to Surplus

The recovery is fuelled by a combination of factors. A rainy autumn and winter, alongside an exceptional Pyrenees snowpack, have contributed significantly. The ski resort at Vall de Núria, for instance, has registered its most significant snow depth on record. With the annual snowmelt now beginning, officials anticipate high reservoir levels.

Seasonal forecasts predicting a warm and rainy spring will likely intensify this thaw. While the influx of water is welcome, it also raises the possibility of managing increased river flows to prevent flooding. The ACA continues to provide updated data on reservoir levels, tracking this transformation from scarcity to abundance.

However, water management groups have urged caution. A recent report highlighted that, while a few months of rain do not erase years of drought, the underlying water stress has not disappeared.

Water as a Driver for Equality

This year’s World Water Day highlights water’s role in social progress. Local stakeholders highlight the principle: “Where water flows, equality grows,” framing access to clean water and sanitation as essential human rights and catalysts for gender equality, aligning with the UN’s Sustainable Development Goals.

Globally, women and girls are disproportionately affected by water scarcity. According to a UN-Water report, they often bear the responsibility for water collection, which can limit educational and economic opportunities. The report notes that over a billion women lack access to safely managed drinking water, a figure that underscores the global stakes of water management.

Building a Resilient Future

The recent drought was a stark reminder of the Barcelona metropolitan area’s vulnerability. In response, Aigües de Barcelona, part of the Veolia group, is advancing a major investment plan to reinforce the region’s water resilience. The company’s work received recent recognition as its Agbar Water Museum in Cornellà welcomed its one-millionth visitor.

The strategy focuses on diversifying water sources to “stop looking at the sky,” as detailed in a report by Metrópoli Abierta. Key projects are underway at two main water treatment hubs:

  • Besòs Pole: Work advances to expand the Besòs water treatment plant, with plans to treat water directly from the Besòs river using advanced ultrafiltration and reverse osmosis. The project, part of a wider revitalisation of the Besòs area (for which local political groups have urged guaranteed funding), aims to achieve a treatment capacity of one cubic metre per second by summer 2026.
  • Llobregat Pole: The Estrella treatment plant in Sant Feliu de Llobregat nears completion, incorporating pioneering treatments like reverse osmosis and activated carbon. In parallel, the Sant Joan Despí plant undergoes an upgrade to enhance the regeneration of water from the Llobregat river.

Beyond securing drinking water, the resilience plan includes proactive maintenance of the sanitation network to prevent flooding during intense rain. A significant intervention is ongoing to renovate the century-old Morrot collector, a critical piece of infrastructure located on the slopes of Montjuïc, which channels a majority of the city’s wastewater.

As Barcelona celebrates the welcome return of water to its reservoirs, the city’s actions reflect a dual focus: appreciating the current relief while investing heavily in the infrastructure needed to secure its water future, regardless of what the skies may bring.