An estimated 880,000 abandoned oil and gas wells dot the United States. These orphaned wells, some of which were deserted as long as a century ago, can leak toxic oil and gas into the groundwater and air. They also emit methane, the planet-warming primary component of natural gas. In 2021, Congress appropriated $4.7 billion to help clean up the mess by giving states the money they need to seal the wells and remediate their surroundings. Over the last two years, the federal Department of Interior has doled out nearly $1 billion of this total. As of March, more than 7,700 wells have been remediated as a result.

But with hundreds of thousands of orphaned wells still to go, the road ahead is rocky, in part because states are struggling to meet the Interior Department’s requirements for receiving the remaining funding. The federal agency awarded an initial $25 million each to roughly 30 states with few strings attached. To receive funding from the next tranche, however, the agency has required that states demonstrate that their remediation efforts meet standards outlined in the Endangered Species Act and the National Historic Preservation Act. As a result, state oil and gas departments, which have little to no experience navigating such requirements, are hiring additional staff and creating new procedures to ensure that, as they clean up thousands of decrepit and leaky oil wells across the nation, they also protect endangered species and cultural sites. The early results of these added requirements show that the pace of cleanup is slowing: Texas, for example, plugged 60 percent fewer wells during the first five months of receiving a recent round of federal funding compared to the period following an earlier grant that did not include these requirements.

“Each tranche seems to get a little harder, a little higher cost, a little more complexity, a greater burden,’” said Dennis Hatfield, Kentucky’s oil and gas division director. “We want to plug them all, but if they [federal officials] make it hard enough, states are going to struggle to meet that standard.”

It’s supposed to be oil and gas companies, rather than state officials like Hatfield, who are responsible for cleaning up well sites. But when companies go bankrupt or otherwise disappear, the responsibility falls to states, tribes, and the federal government. When Congress passed the Bipartisan Infrastructure Law, it included three rounds of grants to help clear the growing backlog of orphan wells. The initial grant of up to $25 million per state was intended to put plugging companies back to work at a time when oil prices were low and the industry was in free fall. Most states have already used that funding, and they’ve reported the amount of avoided methane emissions as a result. (In a report to Congress late last year, the Interior Department noted that regulators in California, Colorado, Louisiana, and New Mexico had plugged 328 of roughly 500 orphan wells that were emitting the equivalent of approximately 11,500 metric tons of carbon dioxide a year.)

The second tranche of money, which consists of so-called formula grants and makes up nearly half of the total $4.7 billion appropriated in the infrastructure law, comes with additional requirements. States are currently in the process of applying for and receiving funding from this second tranche. The final tranche, which consists of so-called performance grants that the Interior Department has not yet begun disbursing, are intended to incentivize state legislatures to provide matching funds for cleanup and encourage policy reforms to reduce orphan well burdens going forward.