Chapin Rose
SB 4004 status: Introduced — Added as Co-Sponsor Sen. Paul Jacobs (updated Sep 2, 2026).
Source
LegiScan
Confidence
High
Analysis basis
LegiScan full bill text
Official summary alongside an AI-generated read on where it stands and why.
Overall Score
Bill summary
The bill prohibits data centers from withdrawing groundwater from the Mahomet Aquifer by 2028, bans local governments from enforcing water-use NDAs with data centers, and mandates annual public water-usage reports.
Existing and future data centers operating in Illinois, local governments, and the Illinois Environmental Protection Agency (IEPA).
Data centers must transition to alternative water sources by January 1, 2028. NDAs must be discarded, and water use must be disclosed.
Significant capital expenditure for data centers to change cooling/water systems; potential legal costs for contract disputes.
Prohibitions begin January 1, 2027; full transition for existing facilities required by January 1, 2028.
Safeguards the Mahomet Aquifer for public drinking and agricultural use; enhances civic transparency regarding industrial resource consumption.
Potential for economic strain on the tech sector; risk of legal challenges; potential costs passed to consumers.
The exact cost of compliance for specific data centers and the availability/feasibility of alternative water sources in the region.
Modeled effects across six domains, estimated from bill text and comparable legislation.
Positive outlook
Critical outlook
Positive outlook
Critical outlook
Positive outlook
Positive outlook
Sourcing already shown above, this is what the analysis found worth flagging.
Source
LegiScan
Official bill text or data from LegiScan.
Confidence
High
Information is complete and verified.
Analysis basis
LegiScan full bill text
Source used for this bill's analysis.
Source note
High risk of litigation regarding the nullification of existing nondisclosure agreements.
Analysis scope
Does not specify which alternative water sources are technically or economically feasible for existing data centers.
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