EPA proposes transferring coal ash landfill oversight to Wisconsin

The U.S. Environmental Protection Agency has proposed shifting oversight of coal ash landfills in Wisconsin from federal hands to state regulators, a move that would reshape who permits, inspects and enforces closure rules at the facilities holding combustion residuals from the state's power plants.

The proposal, reported by Civic Media, centers on the class of waste known as coal combustion residuals — the ash and scrubber sludge that utilities have piled into landfills and surface impoundments for decades. If EPA finalizes the transfer, Wisconsin regulators would take the lead on a disposal stream long governed under the federal CCR rule framework.

What does the proposal change?

Under the current arrangement, federal rules set the baseline for how coal ash landfills are sited, lined, monitored and closed. A state takeover would put day-to-day permitting and enforcement decisions with Wisconsin's environmental agency rather than EPA Region 5.

That shift matters for the material stream itself. Coal ash contains arsenic, lithium and other contaminants that can leach into groundwater, and oversight questions — who signs off on liner requirements, who sets groundwater monitoring schedules, who orders corrective action — determine whether stored ash stays contained.

The proposal does not change the physical volume of ash in Wisconsin's landfills. It changes the regulator holding the pen.

Why is state primacy significant?

EPA has allowed states to run their own coal ash programs when state rules are at least as protective as the federal CCR standard. Approval of a state program shifts the enforcement burden to state staff and state budgets, and it moves permit disputes from federal dockets to state administrative processes.

For utilities operating ash landfills in Wisconsin, a state-led program typically means one primary regulator rather than parallel federal and state oversight. For communities near impoundments and landfills, it means the state agency becomes the first — and often only — point of contact for compliance complaints.

The Civic Media report did not specify a timeline for EPA's decision or a public comment period. Those procedural details will determine how quickly, and with how much public input, the transfer proceeds.

Who decides what happens next?

The proposal now advances through EPA's approval process. The agency must assess whether Wisconsin's regulatory framework meets the federal protectiveness standard before any authority transfers.

The milestone to track is the final sign-off. Until EPA formally approves the state program, federal CCR rules continue to govern Wisconsin's coal ash landfills. After approval, every liner approval, closure plan and groundwater enforcement action at those facilities flows through the state.

A public comment window, if opened, would give utilities, municipalities and environmental groups a formal channel to contest or support the handover before the decision becomes final.

By Rebecca Stone