The Environmental Protection Agency has proposed scaling back federal oversight of hundreds of aging coal ash storage sites across the country, a move that could leave communities near coal-fired power plants with fewer protections against toxic groundwater contamination, the Washington Post reported in April 2026.
The proposed amendments target rules finalized during the Biden administration that expanded monitoring of legacy waste ponds, many of which sit near waterways and residential neighborhoods. Filed under docket EPA-HQ-OLEM-2020-0107, the changes would broaden deferrals and ease requirements for some of the most contamination-prone disposal sites in the United States, according to EPA documents outlining the proposal.
What the proposal would change
Coal ash is the powdery residue left after burning coal for electricity. It contains arsenic, mercury, lead, and other heavy metals that can leach into groundwater and surface water when stored improperly. For decades, utilities dumped this waste into unlined pits with little federal oversight, a practice that contributed to disasters like the 2008 Kingston Fossil Plant spill in Tennessee, when a containment wall failed and released 1.1 billion gallons of coal ash slurry into the Emory River, burying homes and contaminating waterways for miles.
That catastrophe, followed by a 2014 spill that coated 70 miles of North Carolina’s Dan River in toxic sludge, drove Congress and the EPA to act. In 2015, the agency finalized the first binding national standards for coal ash disposal under the Resource Conservation and Recovery Act’s Subtitle D. The 2015 rule set requirements for location restrictions, structural integrity, groundwater monitoring, corrective action when contamination was detected, and closure planning.
But the 2015 rule left a significant gap: it did not cover legacy surface impoundments, older waste ponds that had stopped receiving ash before the rule took effect. Environmental groups, including Earthjustice and the Sierra Club, spent years pressing the EPA to close that loophole, arguing that these aging, often unlined ponds still held millions of tons of coal ash above aquifers and beside rivers.
The Biden administration responded with a May 2024 final rule that brought those legacy ponds under federal jurisdiction for the first time. The expansion tightened eligibility criteria and imposed monitoring, corrective action, and closure requirements on disposal sites that utilities had operated for decades with minimal federal scrutiny.
The 2026 proposed amendments would reverse much of that expansion. According to the EPA’s overview, the agency is considering broader deferrals for legacy impoundments and changes to the eligibility criteria that determine which sites must comply with the stricter framework. In practical terms, certain aging coal ash ponds could be exempted from cleanup and monitoring timelines the 2024 rule imposed, delaying requirements for groundwater sampling, engineering assessments, and closure planning.
Under the proposal, facility owners could seek additional time before implementing corrective action at sites already known to be leaking contaminants. Some categories of legacy impoundments could be reclassified in ways that reduce their obligations for public reporting or structural upgrades.
What the regulatory record shows
The paper trail is extensive. The 2015 baseline rule, published in the Federal Register under document number 2015-00257, created the first enforceable federal standards after years of voluntary guidelines that states applied unevenly. Before 2015, coal ash regulation depended on a patchwork of state programs, and enforcement varied dramatically from one jurisdiction to the next.
The 2024 Legacy Final Rule, published under document number 2024-09157, closed the gap that had left older ponds unregulated. The EPA’s coal ash rule page tracks the full timeline of these regulatory actions, including state permit program discussions and public comment logistics.
The agency has also designated coal ash compliance as a national enforcement and compliance priority, a status described on its national enforcement and compliance initiatives page. That designation shapes how the EPA allocates inspection resources and directs staff toward facilities with documented or suspected violations, reflecting the agency’s own assessment that coal ash mismanagement poses ongoing risks to public health and the environment.
Docket materials confirm that the 2026 proposal is structured as an amendment to existing regulations rather than a wholesale rewrite. The EPA intends to retain core elements of the 2015 framework, such as basic liner standards and groundwater monitoring for many active units, while carving out additional flexibility for older, less heavily regulated sites. That distinction between active and legacy units is central to understanding which communities would feel the effects of any rollback most directly.
What remains uncertain
Several critical questions about the proposal’s real-world impact remain unanswered. The EPA has not published projections of how many legacy impoundments would qualify for broader deferrals, or how long those deferrals would last. Without that data, it is difficult to gauge how many communities near unlined waste ponds would lose the monitoring protections the 2024 rule was designed to provide.
The environmental justice dimensions are also unresolved. Coal ash disposal sites are disproportionately located near low-income communities and communities of color, a pattern the EPA itself has acknowledged in previous rulemakings. Loosening oversight of legacy ponds could deepen those disparities, but the agency has not released an updated environmental justice analysis specific to the 2026 amendments.
State-level enforcement is another open question. The 2015 rule envisioned state permit programs as a key implementation mechanism, and the EPA’s rulemakings page discusses those programs at length. But it remains unclear whether loosened federal oversight would prompt states to strengthen their own rules or simply defer to the reduced federal baseline. The answer likely varies by state, raising the prospect of a return to the uneven patchwork that preceded the 2015 rule.
The economic argument is similarly incomplete. Utilities and industry groups have argued that compliance costs under the 2024 rule are excessive, particularly as coal plants retire and operators face closure obligations for sites that will no longer generate revenue. The EPA has not released a formal cost-benefit analysis for the 2026 proposal that would allow independent evaluation of those claims against the public health costs of delayed cleanups.
Flood risk adds another layer of concern. Legacy impoundments near floodplains face heightened contamination risks during extreme weather, when rising water can breach containment structures and spread coal ash across wide areas. The 2015 rule included location restrictions partly to address this threat, but the proposed deferrals could delay corrective action at sites where flooding has already been documented as a problem.
What to watch next
As the proposal moves through public comment and potential revision, the central questions will be how many sites gain additional time before cleanup, how long that time lasts, and what happens if contamination worsens in the interim.
For residents living near coal plants, the most immediate step is to identify which category their local disposal sites fall into. Active, lined landfills and impoundments covered since 2015 are likely to remain under relatively stringent federal oversight. Legacy ponds, especially those that stopped receiving waste before the original rule took effect, are the ones most directly affected by the 2026 amendments. Local groundwater monitoring data, where publicly available, can help show whether contamination has already migrated beyond facility boundaries.
What the existing record makes clear is that the 2015 rule marked a turning point toward stronger federal oversight of coal ash, the 2024 expansion extended that oversight to long-neglected ponds, and the 2026 amendments would partially reverse that trajectory. The communities closest to these sites will bear the consequences of whichever direction the EPA ultimately takes.
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*This article was researched with the help of AI, with human editors creating the final content.
