Water systems worldwide are under intensifying pressure from climate change, rapid urbanization, population growth, and ageing infrastructure. These pressures threaten the delivery of sustainable, reliable, resilient, and affordable water and water-related services. Without forward-looking solutions, the sector faces rising risks including environmental degradation, declining water quality, public health challenges, and damage from extreme weather events. Building climate-ready resilience now requires integrated management, green infrastructure, and data-driven innovations that strengthen long-term water security.
Water and Climate Change
Climate change is expected to significantly reduce renewable surface water and groundwater supplies over the coming decades. For every degree of global warming, an estimated seven percent of the global population may face a decrease of at least twenty percent in renewable water resources. This trend will intensify pressure on cities, industries, farmers, and ecosystems as demand rises while supplies become more variable.
Across many regions, climate change is projected to increase the frequency and severity of meteorological droughts, agricultural droughts, and hydrological droughts. These shifts affect rainfall patterns, soil moisture, and the availability of surface and groundwater, requiring water managers to balance competing needs across households, food systems, energy generation, and manufacturing.
At the same time, more frequent and intense storms will elevate flood risks. In high-emissions scenarios, the number of people exposed to the equivalent of a historical 100-year river flood is projected to increase substantially. Extreme rainfall events can overwhelm stormwater systems, trigger localized flooding, and wash contaminants such as nutrients, sediment, and bacteria into waterways. In cities with combined drainage networks, severe downpours may cause combined sewer overflows that degrade water quality and undermine regulatory compliance.
Deteriorating water quality carries direct public health implications. Elevated turbidity following heavy rainfall, for example, is linked to higher rates of acute gastrointestinal illness among vulnerable groups. In coastal regions, sea-level rise combined with intensive groundwater extraction can accelerate saltwater intrusion, affecting drinking water aquifers and increasing treatment costs. Communities may ultimately need to relocate water intakes or invest in alternative water supplies to maintain drinking water quality.
These climate-driven pressures compound non-climatic challenges. Population growth is expected to place nearly six billion people in water-scarce regions by 2050. Urbanization increases demand while contributing to land-use change that degrades the quality of source watersheds. To secure water resources in this evolving context, the water sector must prioritize innovations that improve climate resilience, enhance water quality, support water reuse, and expand the efficient use of limited supplies.
Case Study: Denver One Water Program
Denver’s One Water Plan demonstrates how integrated planning can transform urban water management in the face of climate and development pressures. The plan was developed by a unique coalition of local water and land-management agencies working together to treat water as a unified and interconnected system rather than separate domains of drinking water, wastewater, stormwater, and flood management.
This coalition, the One Water Leaders (OWLs), includes the City and County of Denver, Denver Water, Metro Water Recovery, Mile High Flood District, The Greenway Foundation/The Water Connection, and the Colorado Water Conservation Board. By coordinating their efforts, these partners address the historical fragmentation of water governance and align their activities around shared resilience goals.
The One Water Plan outlines five core objectives: strengthening institutional collaboration, promoting multi-benefit projects, building community support, improving climate preparedness, and implementing integrated water solutions. The plan complements Denver’s Comprehensive Plan 2040 and provides a roadmap for long-term water security across the entire urban cycle.
Key strategies include connecting land-use planning with water management, exploring financial incentives to reduce emissions, and expanding water efficiency and reuse on both public and private properties. A flagship example is the National Western Center Campus, which integrates green infrastructure, river corridor restoration, and an innovative sewer-heat recovery system that provides nearly ninety percent of the campus’s heating and cooling. This approach demonstrates how climate-resilient design, nature-based solutions, and circular water principles can work together to create sustainable and adaptable urban environments.
Conclusion
Achieving water security in a changing climate requires a shift from traditional siloed management toward integrated, climate-resilient, and innovation-driven approaches. By adopting holistic planning models such as Denver’s One Water Program and expanding technologies that enhance conservation, reuse, and resource recovery, the water sector can ensure the continued delivery of reliable and resilient services. Treating water as a single resource moving through a continuous urban cycle strengthens preparedness for extreme weather, protects public health, and builds long-term resilience for communities and ecosystems.
Newly Published: Circular Economy and Liveable Cities (Cambridge University Press)
The Circular Economy and Liveable Cities, edited by Robert C. Brears, Our Future Water, has been published. This essential guide delivers actionable strategies and best practices for implementing circular economy, climate resilience, and sustainability in urban environments, with global examples from leading cities like Tokyo, New York, and Singapore to help planners, policymakers, and researchers build liveable and sustainable cities for the future.
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📚 Shape the Future of Sustainability: Contribute to Springer Nature’s Landmark Publications
As Editor-in-Chief, Robert C. Brears invites experts, researchers, and practitioners to contribute to impactful and forward-thinking publications from Springer Nature. These comprehensive Handbooks and Encyclopedias explore Nature-Based Solutions, sustainable resource management, ecosystem well-being, and the global energy transition.
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