For well over a century, the oil and gas industry has drilled holes across California in search of black gold and a lucrative payday. But with production falling steadily, the time has come to clean up many of the nearly quarter-million wells scattered from downtown Los Angeles to western Kern County and across the state.

The bill for that work, however, will vastly exceed all the industry’s future profits in the state, according to a first-of-its-kind study published on May 18 and shared with ProPublica.

“This major issue has sneaked up on us,” said Dwayne Purvis, a Texas-based petroleum reservoir engineer who analyzed profits and cleanup costs for the report. “Policymakers haven’t recognized it. Industry hasn’t recognized it, or, if they have, they haven’t talked about it and acted on it.”

The analysis, which was commissioned by Carbon Tracker Initiative, a financial think tank that studies how the transition away from fossil fuels impacts markets and the economy, used California regulators’ draft methodology for calculating the costs associated with plugging oil and gas wells and decommissioning them along with related infrastructure. The methodology was developed with feedback from the industry.

The report broke down the costs into several categories. Plugging wells, dismantling surface infrastructure and decontaminating polluted drill sites would cost at least $13.2 billion, based on publicly available data…

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