The U.S. Environmental Protection Agency has proposed approving Wisconsin's application to take over permitting of coal ash landfills, moving a key piece of federal coal combustion residuals oversight to state hands.

The proposal, announced by the agency, would transfer permit authority for coal ash landfills in Wisconsin from the federal coal combustion residuals (CCR) program to the state's regulators. If finalized, Wisconsin would administer the permitting regime for these disposal facilities within its borders, a shift that utility operators and landfill owners in the state would deal with through Madison rather than through EPA regional channels.

Coal ash — the residual material left after coal is burned at power plants — is regulated at the federal level under the CCR rule, which EPA finalized in 2015 to set disposal standards for landfills and surface impoundments. States can seek approval to run their own permit programs for these facilities, provided EPA determines the state program meets federal requirements. Wisconsin has now cleared the proposal stage of that review.

What does the proposal change?

Under the current arrangement, coal ash landfill permitting in states without approved programs remains a federal responsibility. EPA's proposal would place Wisconsin on the list of states — a short one so far — with EPA-approved CCR permit programs of their own.

For facility operators, the practical change is the permitting counter. Applications, compliance determinations and enforcement for coal ash landfills in Wisconsin would route through the state agency rather than EPA. For the material stream itself, the underlying federal disposal standards do not disappear; an approved state program must be at least as protective as the federal rule.

The proposal signals EPA's finding that Wisconsin's program meets that threshold. That finding is now subject to public comment before any final approval takes effect.

Why does state permitting matter for coal ash?

Coal ash occupies an awkward position in the waste regulatory map. It is not classified as hazardous waste under Subtitle C of the Resource Conservation and Recovery Act. Instead, it sits under Subtitle D-style standards, the framework used for municipal solid waste landfills, which historically left implementation to the states.

The 2015 federal CCR rule changed that balance after high-profile disposal failures, establishing national criteria for location, liner design, groundwater monitoring and corrective action at coal ash units. The rule also created the pathway Wisconsin is now using: a state can apply to run its own CCR permit program, and EPA can approve it if the program is equivalent to the federal one.

Each approval shifts day-to-day oversight of a state's coal ash disposal footprint to state regulators while keeping EPA in a backstop role. Federal approval of a state program does not end federal authority; it layers state administration on top of federal minimums.

Who is affected?

The facilities covered by the transfer are coal ash landfills in Wisconsin. The state hosts coal-fired generation and the disposal units that serve it, along with legacy ash sites from plants that have retired or converted. Utility operators that manage those units would face state-issued permits rather than federal determinations.

Beneficial use is a separate track. Coal ash routed into concrete, wallboard or other applications falls outside disposal permitting, and the proposal concerns landfills, not use markets. For the recycling side, the significance is narrower but real: state-administered permitting can move faster than federal processing, which matters for closure plans, landfill expansions and the sorting of material between disposal and reuse.

What happens next?

The proposal is not yet a transfer. EPA must review public comments and issue a final approval decision before Wisconsin's program takes over. Only on final approval does permit authority move.

That final decision is the milestone to watch. It will determine when Wisconsin's coal ash landfill permitting shifts to the state, and it will add a data point to the slow accumulation of approved state CCR programs nationwide — a roster that remains short years after the pathway opened.