The US Environmental Protection Agency published its final rule on October 13, 2026, transferring Underground Injection Control (UIC) Class VI primacy for deep geological carbon storage to Colorado, with full state jurisdiction commencing November 12, 2026.

Governor Jared Polis placed the transfer in the geology beneath every permit. "Having Class VI oversight in Colorado will allow fast decisions about permitting underground carbon storage to be made by Colorado experts who understand our geology, communities and environment," Polis said.

What does Class VI primacy change for storage developers?

The Colorado Energy and Carbon Management Commission (ECMC) will assume sole responsibility for reviewing applications, issuing permits, monitoring operational performance, and enforcing compliance for Class VI injection wells across state lands. The state submitted its primacy application in October 2025, after the Colorado General Assembly authorized the ECMC to pursue Class VI authority in 2023.

The application demonstrated that Colorado's technical guidance, enforcement mechanics, and public engagement protocols meet or exceed federal Safe Drinking Water Act (SDWA) mandates. Federal approval capped a multi-year rulemaking and capacity-building effort inside the commission.

The transfer also follows a separate cross-border agreement between Colorado and Wyoming on CO2 storage. State primacy places both the permitting desk and the geological review within the same regional jurisdiction for projects that straddle the state line.

How will the ECMC process a Class VI permit?

State-level review follows a two-stage approval process. The Commission first approves a project's Class VI Development Plan, then conducts a secondary verification review before issuing the formal Authorization to Inject.

Project developers must demonstrate site integrity across target storage formations and caprock seals. They must post financial assurance sufficient to cover emergency response and well plugging. Each application moves through mandatory public comment periods before the Authorization to Inject issues.

The structure mirrors EPA practice. The transfer moves the desk, not the standard.

Who covers long-term well stewardship?

Colorado's Geologic Storage Stewardship Enterprise, authorized under House Bill HB25-1165, will collect fees directly from Class VI injection operators. The fees fund post-operational liability and long-term well care after injection ceases.

The mechanism answers the open question facing every Class VI project: who remains accountable for a closed injection well thirty or fifty years after the last ton of CO2 enters the formation? The stewardship enterprise transfers that obligation, and its costs, from taxpayers to the operators who injected.

What authority does the EPA retain?

The EPA retains direct permitting authority over Class VI injection activities on Tribal lands and will continue to oversee Colorado's state primacy program. Federal review does not lapse with the transfer.

What milestone decides what happens next?

The next milestone is fixed. On November 12, 2026, the ECMC begins processing Class VI applications under state rules, and operators see their next filing window align with Denver rather than Washington. Project sponsors with pending Class VI plans will watch the ECMC's first Development Plan approvals as the first official test of the new state timeline.