SB1723 amends the Illinois Environmental Protection Act to add new restrictions and oversight related to carbon sequestration, with a particular focus on the Mahomet Aquifer and other sole source aquifers. The bill defines key terms such as carbon dioxide capture projects, carbon dioxide streams, sequestration facilities, and carbon sequestration activity, and it clarifies that carbon sequestration activities generally require state permitting, compliance with Pollution Control Board rules, reporting, and, where applicable, an order for integration of pore space from the Department of Natural Resources.
A central substantive change is a new prohibition on carbon sequestration activity within a sequestration facility that overlies, underlies, or passes through a sole source aquifer, while preserving the Agency’s authority to deny permits. The bill also creates the Mahomet Aquifer Advisory Study Commission to study the safety of carbon capture and storage in the Mahomet Aquifer area and any EPA-designated project review areas. The commission is tasked with reviewing reports, engaging stakeholders, posting materials publicly, and receiving administrative support from the University of Illinois.
The bill further directs the Prairie Research Institute at the University of Illinois at Urbana-Champaign to prepare annual status reports and a final report assessing the safety and risks of carbon dioxide storage in the Mahomet Aquifer area, including effects on human, animal, and environmental health, as well as comparisons to other states and review of federal permitting coordination. The commission is temporary and is scheduled to be dissolved on January 1, 2032.
The bill’s impact on state law is to tighten Illinois regulation of carbon sequestration near sensitive drinking-water resources, especially by adding a categorical restriction around sole source aquifers and by establishing a formal study and reporting process for the Mahomet Aquifer. It affects carbon capture and storage developers, permit applicants, landowners, utilities, environmental regulators, and local stakeholders in central Illinois, while also reinforcing the role of state agencies in reviewing and potentially denying projects.
Overall sentiment appears generally supportive in the legislature, as reflected by strong Senate approval and a substantial House majority, though not unanimous. The main point of contention is the balance between promoting carbon sequestration as a climate tool and protecting drinking water resources; supporters emphasize the aquifer’s unique importance and the need for extra safeguards, while opponents or skeptics likely focused on limiting carbon capture development, potential impacts on energy and industrial projects, and the breadth of the new aquifer restriction.
SB1723 amends the Environmental Protection Act, specifically Title relating to carbon sequestration, by revising definitions, prohibitions, and permitting requirements and by adding a new section creating the Mahomet Aquifer Advisory Study Commission. It imposes a new ban on carbon sequestration activity in sequestration facilities that overlie, underlie, or pass through a sole source aquifer, while leaving intact existing permitting authority and other regulatory requirements. The bill also creates a temporary advisory and study structure through 2031-2032 to evaluate risks, gather stakeholder input, and report on carbon storage impacts in the Mahomet Aquifer region.
The voting history suggests the bill had broad legislative support, passing the Senate 54-0 and the House 91-19. That pattern indicates a generally favorable sentiment toward stronger protections for the Mahomet Aquifer and additional oversight of carbon sequestration. At the same time, the House vote shows there was still meaningful opposition, likely tied to concerns about restricting carbon capture and storage development or imposing additional regulatory burdens.
The main controversy is the tension between climate-policy goals and groundwater protection. Supporters view carbon sequestration as a useful decarbonization tool but argue that the Mahomet Aquifer’s status as a sole source drinking-water supply justifies extra safeguards and a study commission. Opponents or critics are likely concerned that the bill creates a broad prohibition on sequestration near sole source aquifers, could hinder carbon capture projects and related industrial investment, and may duplicate or complicate existing federal and state permitting processes. The inclusion of labor-related project labor agreement language and stakeholder engagement requirements may also have drawn attention from industry, labor, and local interests, though the aquifer restriction is the bill’s central point of dispute.