Taxpayers Could Face Millions in Cleanup Costs for Abandoned Oil and Gas Wells in Illinois

Study finds thousands of unplugged wells pose health and environmental risks, with the state potentially liable for over $1 billion in cleanup costs.

Published on Feb. 24, 2026

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A new report from the Bluhm Legal Clinic at Northwestern University and environmental group ClientEarth USA finds that Illinois has over 30,000 inactive oil and gas wells that have not been properly plugged, potentially exposing taxpayers to more than $1 billion in future cleanup costs. The report cites weak state regulations, lack of data on well status, and the industry's ability to avoid responsibility as key factors behind the growing liability.

Why it matters

Abandoned oil and gas wells can leak toxic pollutants and greenhouse gases, threatening air and drinking water quality in nearby communities. However, the report suggests the state's regulatory framework makes it difficult to hold drilling companies accountable for the costs of plugging and remediating these wells, potentially leaving taxpayers on the hook.

The details

The report found that while Illinois has over 23,400 active oil and gas production wells, as well as thousands of injection and storage wells, the state does not collect comprehensive data on well status or production. This makes it hard to identify which wells are inactive and need to be plugged. Additionally, companies can avoid plugging requirements by repeatedly applying to have wells classified as 'temporarily abandoned.' The report argues that the state's bonding requirements are too weak to ensure companies cover cleanup costs, and that the Illinois Department of Natural Resources has often failed to enforce plugging orders.

  • Oil and gas production in Illinois dates back to the 1850s, with peak production in the early 1940s.
  • In 2025, Illinois passed Senate Bill 2463 to increase bonding requirements for new well permits and those with past violations.
  • In the 2023-2024 fiscal year, the state's Plugging and Restoration Fund had a budget of just over $64.8 million, mostly from federal grants.

The players

Bluhm Legal Clinic at Northwestern University

A legal clinic that conducted research for the report on abandoned oil and gas wells in Illinois.

ClientEarth USA

An environmental advocacy group that collaborated with the Bluhm Legal Clinic on the report.

Illinois Department of Natural Resources (IDNR)

The state agency responsible for regulating oil and gas wells and enforcing plugging requirements, though the report suggests it has often failed to do so effectively.

Illinois Petroleum Resources Board

A private, member-based industry association that declined to comment on the report.

Robert Weinstock

Director of the Environmental Advocacy Center at Northwestern's Pritzker School of Law and lead author of the report.

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What’s next

The report recommends that the Illinois Department of Natural Resources take more aggressive enforcement action to ensure well owners and operators are held responsible for plugging inactive wells, as well as legislative changes to increase bonding requirements and restrict the ability of companies to avoid cleanup costs.

The takeaway

This report highlights the significant financial and environmental risks posed by thousands of unplugged oil and gas wells in Illinois, and the need for stronger state regulations and enforcement to hold the industry accountable for the cleanup costs rather than passing them on to taxpayers.