Nationwide sustainability assessment of PFAS treatment in U.S. water utilities

Per- and polyfluoroalkyl substances, or PFAS, have become one of the most pressing challenges facing drinking water systems across the United States. These synthetic chemicals, prized for their resistance to heat, water, and grease, have been used for decades in countless industrial and consumer applications. Their extraordinary chemical stability, the very property that made them commercially valuable, also means they persist in the environment and accumulate in water sources, earning them the nickname “forever chemicals.” As new national regulations mandate their removal from drinking water, utilities of every size are now confronting the question of how to treat their water effectively, affordably, and sustainably.

A recent study published in Nature Communications by Md. Moshiur Rahman Tushar, Zaki Alam Pushan, Christopher Sutton Page, Nirupam Aich, and Lewis Stetson Rowles provides the most comprehensive sustainability assessment to date of the two most widely applied PFAS treatment technologies: granular activated carbon and ion exchange resins. The research team leveraged a quantitative sustainable design framework that integrates techno-economic analysis with life cycle assessment to evaluate how these technologies perform across utilities nationwide. Rather than examining a single plant or a narrow set of conditions, the study captures the diversity of real-world scenarios that American water systems face, from small rural wells drawing groundwater to large municipal facilities treating surface water.

The methodological approach is notable for its rigor. Techno-economic analysis quantifies the capital and operating costs associated with each treatment option, accounting for factors such as media replacement frequency, energy consumption, and system scale. Life cycle assessment, meanwhile, traces the environmental footprint of each technology from raw material extraction through manufacturing, transport, operation, and disposal. By combining these two lenses, the researchers could identify not only which technology is cheaper but also which carries a lower burden in terms of greenhouse gas emissions and resource depletion. Uncertainty and sensitivity analyses were then applied to determine which variables most strongly influence the outcomes, a critical step for translating model results into actionable guidance.

The findings reveal that utility size, water type, and PFAS chain length are the dominant drivers of both cost and environmental impact. Larger utilities benefit from economies of scale that spread fixed costs across greater volumes of water, while smaller systems face disproportionately high per-gallon treatment expenses. The source of the water matters as well: groundwater and surface water present different chemical matrices that affect how treatment media perform and how often they must be replaced or regenerated. Perhaps most significantly, the chain length of the PFAS compounds being targeted emerged as a key variable, with short-chain PFAS proving considerably more difficult and expensive to remove than their long-chain counterparts.

One of the clearest results of the study is that ion exchange consistently shows lower global warming potential than granular activated carbon. This advantage stems from the fundamental chemistry of the two approaches. Granular activated carbon relies on adsorption, a process in which PFAS molecules stick to the vast internal surface area of carbon particles. As the carbon becomes saturated, it must be replaced or regenerated, generating ongoing material and energy demands. Ion exchange resins, by contrast, use charged functional groups to selectively capture PFAS molecules, often achieving higher capacity and longer operational lifetimes before replacement is needed. The reduced frequency of media changeout translates directly into lower cumulative emissions over the life of the system.

However, the study also underscores that no single technology is optimal under all conditions. Water quality, particularly the concentration of total organic carbon, exerts a strong influence on treatment performance and can shift the relative cost and environmental profiles of granular activated carbon systems. Organic matter in the water competes with PFAS for adsorption sites on the carbon, accelerating exhaustion of the media and increasing replacement frequency. In waters with high organic content, the economic and environmental advantages of one technology over another can reverse, meaning that utilities must carefully characterize their source water before committing to a treatment strategy.

The treatment of short-chain PFAS significantly increases costs regardless of the technology chosen. Short-chain PFAS molecules, which have fewer carbon-fluorine units, are more mobile in water and less strongly retained by both activated carbon and ion exchange media. This reduced affinity means that media must be replaced more frequently or operated at lower flow rates to achieve the same removal efficiency, driving up both operating expenses and the environmental footprint associated with media production and disposal. As regulatory attention increasingly encompasses the full spectrum of PFAS compounds, including shorter-chain varieties, this finding carries substantial implications for utilities nationwide.

Perhaps the most socially consequential finding of the study concerns the disproportionate burdens placed on small and rural systems. These utilities, which serve a large fraction of the American population through thousands of independent systems, typically lack the financial reserves, technical staff, and ratepayer base of large metropolitan utilities. When the per-unit costs of PFAS treatment are highest for exactly these systems, the result is a potential equity crisis in which rural communities face steep rate increases or struggle to comply with federal standards at all. The researchers highlight these trade-offs as central to technology selection, arguing that policy frameworks must account for the uneven distribution of compliance costs.

The work provides actionable insight for utilities and policymakers seeking more equitable and sustainable strategies for meeting emerging PFAS standards. By identifying the specific variables that drive cost and environmental outcomes, the study enables decision-makers to tailor treatment selections to their particular circumstances rather than relying on one-size-fits-all prescriptions. A utility drawing low-organic groundwater with predominantly long-chain PFAS contamination faces a very different calculus than one treating organic-rich surface water with a mixture of short-chain and long-chain compounds. The quantitative framework developed by the research team offers a template for making these distinctions rigorously rather than anecdotally.

As the United States moves forward with the implementation of national PFAS regulations, studies of this kind arrive at a critical juncture. The scale of the challenge is enormous, involving thousands of water systems and billions of dollars in potential infrastructure investment. The findings from this nationwide sustainability assessment make clear that the path forward is not simply a matter of installing the most effective technology available, but of matching treatment approaches to local conditions while remaining vigilant about the broader environmental consequences of the treatment process itself. In doing so, the research contributes to a growing recognition that sustainability in water treatment must be evaluated holistically, encompassing not only the removal of contaminants but also the energy, materials, and economic resources consumed in achieving that removal.

Subject of Research: Nationwide sustainability assessment of PFAS treatment in U.S. water utilities

Article Title: Nationwide sustainability assessment of PFAS treatment in U.S. water utilities

Article References: Tushar, M. M. R., Pushan, Z. A., Page, C. S., Aich, N., & Rowles, L. S. (2026). Nationwide sustainability assessment of PFAS treatment in U.S. water utilities. Nature Communications. https://doi.org/10.1038/s41467-026-77509-w

Image Credits: AI Generated

DOI: 10.1038/s41467-026-77509-w

Keywords: Nationwide, sustainability, assessment, PFAS, treatment, water, utilities, scientific research