Research indicating that many Miami-Dade County water samples exceeded federal PFAS limits highlights the growing need for source-water protection, long-term treatment planning and continued regulatory monitoring.
A multiyear analysis of water in Miami-Dade County has found widespread detections of per- and polyfluoroalkyl substances, commonly known as PFAS. Researchers Natalia Soares Quinete and Carolina Cuchimaque Lugo reported that approximately 80% to 95% of the samples evaluated exceeded applicable federal limits for certain PFAS.
The findings are significant for a county of approximately 2.8 million residents and illustrate the challenges water systems face as they respond to increasingly stringent standards for the persistent compounds.
PFAS are a large group of synthetic chemicals used in products such as firefighting foams, nonstick cookware, stain-resistant materials, food packaging and water-repellent clothing. Often called “forever chemicals,” they break down very slowly and can migrate into soil, groundwater and drinking-water sources.
Miami-Dade regularly monitors its water supply. However, routine testing cannot prevent contaminants released elsewhere from reaching source water. Potential local contributors include airports and fire-training locations where PFAS-containing foams were historically used, along with landfills, wastewater, industrial activity and consumer products.
The U.S. Environmental Protection Agency established enforceable maximum contaminant levels of 4 parts per trillion for both PFOA and PFOS in 2024. EPA has since proposed allowing water systems additional time—potentially until 2031—to meet those limits, while leaving monitoring and reporting requirements in place. The evolving regulatory schedule makes continued monitoring and careful capital planning essential for affected utilities.
Miami-Dade is evaluating treatment options that could include reverse osmosis and ion exchange. Granular activated carbon is another technology recognized by EPA for PFAS control. Selecting an appropriate process will depend on the PFAS compounds present, their concentrations, existing plant infrastructure, waste-disposal requirements, operational demands and lifecycle cost.
Because the county operates multiple treatment facilities, implementing PFAS removal at system scale could require substantial investment. Reverse osmosis can remove a broad range of contaminants but involves significant energy use, concentrate management and infrastructure costs. Ion exchange and activated carbon can be less energy-intensive, although their effectiveness and media-replacement requirements vary with water chemistry and the types of PFAS being treated.
For water professionals, Miami-Dade’s experience underscores four priorities: identifying contamination before it reaches production wells, collecting reliable long-term monitoring data, evaluating treatment through pilot testing and preparing adaptable capital plans as federal requirements evolve.
PFAS management is unlikely to be solved by treatment alone. Source control, wellfield protection, residuals management and coordination among utilities, regulators and potential contributors will also be necessary. Miami-Dade’s decisions may therefore offer useful lessons for other large water systems confronting the same combination of persistent contamination, stringent standards and costly infrastructure choices.
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