A new study by Gözde Koca of Bilecik Şeyh Edebali University offers fresh insight into how OECD nations manage water—a resource as vital to industry as it is to life itself. By applying four advanced decision-making models (ARAS, MARCOS, CODAS, and COPELAND), Koca and her team ranked 38 countries on water-use efficiency, testing whether rankings hold steady when the weight given to different factors changes.
The research, published in *Cleaner Water* (Turkish: *Temiz Su*), is not just an academic exercise. It reveals that while the top performers—Luxembourg, Iceland, Denmark, the Netherlands, and Switzerland—maintain their positions regardless of how water-use criteria are weighted, countries in the middle tier show surprising sensitivity. “This means that small shifts in policy focus can lead to measurable changes in rankings,” says Koca. “For a country like Türkiye, which sits between 24th and 29th depending on the model, targeted improvements in agricultural water efficiency could move it up several places.”
What makes this study particularly relevant for energy and industrial sectors is its use of seven real-world indicators: industrial, agricultural, and service water efficiency; water stress; and rates of freshwater and agricultural withdrawal from total renewable resources. These are not abstract concepts—they directly affect operational costs, regulatory compliance, and long-term planning for power plants, data centers, and manufacturing facilities.
The research also introduces three distinct weighting frameworks: Equal Weight, Entropy-based (data-driven), and AHP (expert judgment). The high Spearman correlations (0.96–0.99) suggest strong overall consistency, but the middle-tier volatility highlights where targeted interventions could yield the greatest return. For energy-intensive industries operating in water-stressed regions, this kind of nuanced insight could guide investment in water recycling, efficiency retrofits, or alternative cooling technologies.
As global water stress intensifies and regulatory scrutiny grows, tools like those used in this study are becoming essential for corporate sustainability strategies. The findings underscore that water efficiency is not a one-size-fits-all metric—context matters, and so does the method of evaluation. In an era where access to water can determine market access, this research offers a data-driven compass for both policymakers and industry leaders navigating an increasingly constrained resource landscape.