A Superfund site is a location in the United States that has been contaminated by hazardous waste and designated by the federal government for cleanup. These sites range from abandoned factories and landfills to former military bases and mining operations. As of early 2026, there are 1,343 active sites on the federal cleanup list, with another 459 that have been cleaned up and removed from it.
How a Site Gets on the List
The Superfund program was created by a 1980 law called the Comprehensive Environmental Response, Compensation, and Liability Act, or CERCLA. Congress passed it in response to high-profile environmental disasters like Love Canal in New York, where a neighborhood built on top of buried chemical waste experienced alarming rates of illness. The law gave the federal government broad authority to force cleanup of hazardous waste sites and hold polluters financially responsible.
Not every contaminated location becomes a Superfund site. The EPA uses a scoring system called the Hazard Ranking System to evaluate how dangerous a site is. Inspectors assess four pathways through which contamination can spread: groundwater, surface water, soil exposure (including vapors seeping into buildings), and air. For each pathway, they score three factors: how likely the site is to release hazardous substances, how toxic and plentiful the waste is, and how many people or sensitive environments are in harm’s way. Those scores are combined into a single number, and sites that score high enough are proposed for the National Priorities List, the official roster of the country’s worst hazardous waste sites.
Common Contaminants and Health Risks
The substances found at Superfund sites vary widely depending on what happened there. Lead is one of the most common, particularly at former smelters and industrial facilities. Asbestos shows up at old manufacturing plants and even in areas where it occurs naturally in the soil. Dioxins, a group of highly toxic compounds produced as byproducts of industrial processes, contaminate soil at many sites. Some locations also have radioactive materials.
Living near these sites carries real health risks. Contaminants can leach into drinking water through groundwater, drift through the air as dust or vapor, or accumulate in soil where children play. Exposure to lead causes developmental problems in children. Asbestos fibers, when inhaled, can cause lung disease and cancer decades later. Dioxins are linked to cancer, reproductive problems, and immune system damage. The specific risks depend on what chemicals are present, how concentrated they are, and how people come into contact with them.
Who Pays for Cleanup
The Superfund program operates on a “polluter pays” principle. The EPA identifies potentially responsible parties, which can include the companies that dumped the waste, the operators who ran the facility, and even the current owners of the property. Those parties can be compelled to either clean up the site themselves or reimburse the government for doing it. This approach has saved taxpayers billions of dollars by shifting costs to the companies that caused the contamination.
When no responsible party can be found, or when the polluters lack the money to pay, the government draws from a trust fund originally financed by taxes on the chemical and petroleum industries. Those taxes expired in 1995, leaving the fund increasingly dependent on general taxpayer revenue for years. In 2021, Congress reinstated the chemical excise taxes as part of the Infrastructure Investment and Jobs Act, with the new rates taking effect in July 2022.
How Cleanup Works
Cleaning up a Superfund site is a long, phased process that often takes a decade or more. It begins with a preliminary assessment, where the EPA reviews the site’s history and visits the location to determine whether hazardous substances pose an immediate threat. If the site scores high enough on the Hazard Ranking System, it’s added to the National Priorities List.
Next comes a detailed investigation to map the full extent of contamination and evaluate cleanup options, weighing both their effectiveness and their cost. The EPA then issues a formal decision document explaining which cleanup approach will be used, after a public comment period where residents and other stakeholders can weigh in. Only then does actual cleanup begin, which can involve removing contaminated soil, treating groundwater, capping waste in place, or a combination of methods.
Even after physical construction is complete, the work isn’t necessarily finished. Groundwater treatment systems, for example, may need to run for years before contaminant levels drop to safe thresholds. The EPA conducts ongoing monitoring and periodic reviews to make sure the cleanup remains effective. Once a site fully meets its cleanup goals and is considered protective of human health and the environment, it’s deleted from the National Priorities List.
Who Lives Near These Sites
An estimated 254 million people, roughly 80% of the U.S. population, live within about six miles of at least one Superfund site. That number is so high partly because many contaminated industrial sites are located in or near cities and suburbs where population density is high. But the burden isn’t shared equally. A 2025 study published in Nature Communications found that Black, Asian, and Hispanic populations are disproportionately overrepresented in the areas immediately surrounding Superfund sites. Asian communities showed the greatest overrepresentation nationally, followed by Black communities. Nearly 148 million people lived near sites where cleanup activities had not yet begun.
This pattern reflects decades of housing discrimination, zoning decisions, and industrial siting that concentrated polluting facilities near communities of color and lower-income neighborhoods. It means the health risks of hazardous waste exposure are not distributed randomly across the population.
What Happens After Cleanup
Cleaned-up Superfund sites don’t just sit empty. Many are redeveloped into parks, solar farms, commercial properties, housing, and wildlife habitat. The EPA runs a Superfund Redevelopment Program specifically to help communities find productive new uses for former waste sites. Of the 459 sites deleted from the National Priorities List so far, many have been transformed into assets for their communities rather than liabilities.
How to Check for Sites Near You
The EPA maintains a free online tool called “Cleanups in My Community” that lets you search by ZIP code or city. It maps every hazardous waste cleanup location in your area, including Superfund sites, and provides details about the type of contamination, the current status of cleanup, and any ongoing monitoring. You can access it directly through the EPA’s website.