Too Little Water, and What There Is Contains Forever Chemicals
Water scarcity—defined as insufficient freshwater to meet human and environmental needs—already affects over 2 billion people globally according to UN estimates, and the problem is projected to worsen as climate change alters precipitation patterns, increases evaporation rates, and destabilizes glacial systems that supply freshwater to hundreds of millions. Into this already stressed global water situation, PFAS contamination adds a dimension of chemical quality degradation that transforms borderline situations into genuine crises: communities with barely adequate water supplies suddenly find those supplies unusable, with no accessible alternative.
Water Scarcity Geography and PFAS Contamination Overlap
The geographic distribution of water scarcity and PFAS contamination overlaps in ways that create compound vulnerabilities. The southwestern United States—experiencing severe multi-year drought conditions that have dramatically reduced reservoir levels and groundwater tables—simultaneously faces PFAS contamination from military bases, industrial facilities, and atmospheric deposition in the same scarce water resources. Arizona, Nevada, and California are managing PFAS in water supplies that are already stressed by scarcity, making treatment infrastructure investments both more urgent and more expensive relative to available water volume.
Australia—a continent with inherent water scarcity exacerbated by climate-intensified droughts—has documented significant PFAS contamination at military installations in water-scarce regions including western Queensland and Northern Territory, where groundwater from AFFF-contaminated aquifers may be the only practical water source for rural communities and agricultural operations. The convergence of PFAS contamination with existing water scarcity challenges has produced communities where the alternatives are contaminated water, no water, or expensive and logistically challenging water importation.
Desalination as PFAS Treatment: Costs and Limitations in Water-Scarce Settings
Desalination—expanding as a water supply technology in water-scarce regions—has complex interactions with PFAS. Seawater desalination using reverse osmosis membranes achieves high PFAS rejection and can theoretically produce PFAS-free freshwater from PFAS-contaminated seawater. However, coastal waters near PFAS sources (military installations, industrial facilities) may have elevated PFAS that reduces RO system performance longevity and increases the risk of PFAS in the product water. The energy intensity of desalination—typically 3 to 10 kWh per cubic meter of product water—represents a significant carbon footprint that conflicts with climate change mitigation goals, particularly when desalination capacity must be expanded specifically to address PFAS contamination of previously usable groundwater sources.
Managed aquifer recharge—injecting treated surface water or recycled water into depleted aquifers to recharge them for future extraction—is a water scarcity management tool with PFAS implications. When recharge water contains PFAS (from stormwater, recycled wastewater, or contaminated surface water), the practice can spread PFAS contamination into previously uncontaminated aquifers. Conversely, properly treated recharge water free of PFAS can dilute existing aquifer PFAS contamination over time. The water-PFAS nexus in managed aquifer recharge programs requires integrated planning that considers chemical quality alongside water quantity—a systems-level analysis that water resource managers in water-scarce regions are beginning to undertake.
International Development Implications
The intersection of water scarcity and PFAS contamination in developing nations creates development finance and technical assistance priorities that international organizations are beginning to address. Water and sanitation programs funded by the World Bank, Asian Development Bank, African Development Bank, and bilateral aid agencies have historically focused on infrastructure provision (wells, pipes, treatment plants) without considering emerging contaminants like PFAS. Incorporating PFAS screening into water supply program design and including PFAS treatment in infrastructure specifications for high-risk areas (near military bases, industrial zones) represents an evolution in water development practice that will require additional technical capacity and modest incremental costs but can prevent PFAS contamination from undermining the health benefits of new water infrastructure investments.