In late March 2026, the EPA Office of Inspector General (OIG) released a series of reports revealing that roughly 100 of the nation’s most contaminated toxic waste sites are at high risk for environmental disasters, potentially threatening the health of millions of Americans.

The watchdog’s review focused on 157 federal Superfund sites that have been prioritized for cleanup due to their severe risks to public health and the environment.

The Scale of the Risk

The OIG identified specific climate-driven threats that could cause containment systems to fail, leading to the spread of toxic materials into surrounding neighborhoods:

• Coastal Risks: 49 sites are vulnerable to sea-level rise or hurricane storm surges, many of which are located near densely populated areas like the Chesapeake Bay.
• Inland Flooding: 47 sites are situated in low-lying areas prone to inland flooding from extreme rainfall.
• Wildfires: 31 sites are located in high-risk zones for catastrophic wildfires.
• Multiple Threats: Several sites are at risk from more than one of these natural disasters simultaneously.

Millions at Risk

The reports underscore the proximity of these toxic zones to residential areas:

• Roughly 3 million people live within one mile of these priority Superfund sites.
• Nearly 13 million people live within three miles.

Critical Findings: Failure to Plan

The OIG’s primary criticism was directed at the five-year cleanup reviews required for these sites. The watchdog found that these plans often failed to meaningfully account for increasing extreme weather events.

“That is a big problem because it means the site managers are not planning mitigation measures,” noted Betsy Southerland, a former EPA director.

Without proactive planning, contaminants—such as the dioxins famously carried into Houston streets from the San Jacinto River Waste Pits during Hurricane Harvey—could be released into communities, poisoning local ecosystems and wasting billions in taxpayer cleanup dollars.

2026 Status Summary