Tourism is where the tension becomes visible in the most immediate human terms. A hotel can average 1,500 litres per room daily, often exceeding local consumption by eightfold. The Mediterranean, handling one-third of global arrivals, faces a structural mismatch: tourism peaks in summer precisely when natural water availability is at its lowest. A resort without water is not an asset; it is a liability.
As water scarcity intensifies across Europe, the tourism sector is entering a new phase of resource constraint. No longer a hypothetical risk, water scarcity is already reshaping the sector, from emergency investments in Portugal to drinking water shortages affecting tourists in Spain [1][2]. The EU’s European Water Resilience Strategy (2025) sets a common direction toward greater water efficiency and resilience [3]. Member states are now turning this into action. In France, the Plan Eau (2023) imposes concrete targets: reduce water withdrawals by 10% by 2030 [4]. Tourism is part of this shift, as reflected in the signing of three water sobriety plans in 2024. Hotels, resorts, and leisure facilities must rethink how they operate, and fast. The equation is simple: stay attractive while dramatically cutting water use.
Historically, tourism water management was reduced to simple awareness gestures, like encouraging guests to reuse towels. Today, the challenge goes far beyond awareness, driven by data, regulation, and the growing pressure on the planet’s freshwater resources.
At Impact Labs, we recently supported Gaia Labs, a pioneering tourism concept in Portugal aiming to build one of Europe’s first fully regenerative ecolodges. Our work involved eco-design recommendations, environmental impact assessment, and the development of integrated sustainability strategy, including a strong focus on water.
On water, our approach followed a three-step logic to develop a closed-loop system: (1) reducing overall consumption, (2) optimizing water use during daily operations, and (3) reusing and recycling water.
Reducing consumption
For the first step, Impact Labs scouted, assessed and helped in the selection and design of solutions such as rainwater harvesting systems, high efficiency equipments and low-flow technologies (e.g. faucets aerators) to minimize baseline demand. While current Portuguese regulations prevent the use of rainwater for showers and taps, all systems were designed to be future-ready, ensuring seamless adoption once legislation evolves.
Optimizing usage
The objective at this stage is to optimize water use throughout the ecolodge’s operations, ensuring that every drop is managed efficiently without compromising guest comfort. The project integrates a natural swimming pool, i.e. with a plant-based filtration system, eliminating the need for chemical treatment. In-room reverse osmosis systems provide safe drinking water, removing the need for bottled water and supporting the ecolodge’s circular water strategy. Behavioral nudges also play a role, to push further guests awareness and consciousness. As an example, smart showerheads that change color based on water usage, will be deployed.
Beyond this, technology is used to help bridge the “value-action gap” among guests. Through dedicated in-room interactive tablets, visitors shift from passive observers to active participants in the sustainability experience. These interfaces offer real-time insights into each guest’s personal water and energy footprint during their stay, contextualized against planetary boundaries.
Recycling water
Finally, water that has already been used is recycled for secondary purposes. Impact Labs guided Gaia Labs in defining the circular water strategy for the lodge. A biological wastewater treatment system (ETAR Ecoflo) enables the reuse of greywater and blackwater for irrigation and agriculture, closing the loop on-site.
To ensure continuous improvement, a “Digital Twin” Management Model, supported by a comprehensive network of smart water (and energy) meters is deployed across all facilities. These IoT devices feed high-granularity data into a centralized Building Management System (BMS), enabling a real-time and predictive understanding of resource consumption. Leveraging this digital infrastructure, the data collected enables advanced optimization mechanisms, opening the door to AI-powered resource management and additional efficiency gains across both water and energy systems.
This data-driven approach will enable the Gaia Labs team to identify and resolve leaks as quickly as possible, while also uncovering opportunities, adjusting behaviors, and measuring impact. Water management will become a strategic asset rather than a passive necessity.
This case illustrates a broader shift: water is no longer a secondary concern in hospitality, it is becoming a core design parameter, measurable, optimizable, and central to regenerative ambition.
References
[1] Reuters, Portugal vows quick anti-drought investment in Algarve tourism hub (2024).
[2] OECD, Strengthening the evidence base for a sustainable tourism future in Portugal: A tailored set of sustainability indicators, OECD Tourism Papers, 2025/06 (2025).
[3] Council of the EU, Council pushes for a holistic water strategy to safeguard water resources and boost resilience (2025).
[4] UN DESA, Plan eau 2023–2030 : pour une gestion résiliente, sobre et concertée de la ressource en eau (2023).