Illinois · Senate Bill 4004 · 104th General Assembly

AQUIFER PROTECTION ACT

SB 4004 Sponsored by Chapin Rose In committee

  1. Introduced Feb 6, 2026
  2. In committee Feb 6, 2026
  3. Passed the Senate Next
  4. Passed the House  
  5. To the governor  
  6. Became law  

What it does

The legislature's own summary of the bill, or its official long title.

Creates the Data Center Water Transparency and Aquifer Protection Act. Provides that, beginning January 1, 2027, no data center operating within the State shall use water from the Mahomet Aquifer. Prohibits State agencies from issuing or renewing a permit authorizing a data center to withdraw groundwater from the Mahomet Aquifer. Requires existing data centers to transition to alternative water sources and cease all…

Read the full title (136 words)

Creates the Data Center Water Transparency and Aquifer Protection Act. Provides that, beginning January 1, 2027, no data center operating within the State shall use water from the Mahomet Aquifer. Prohibits State agencies from issuing or renewing a permit authorizing a data center to withdraw groundwater from the Mahomet Aquifer. Requires existing data centers to transition to alternative water sources and cease all groundwater withdrawals from the Mahomet Aquifer by no later than January 1, 2028. Provides that a unit of local government may not enter into, enforce, or renew any nondisclosure agreement, confidentiality clause, or similar contractual provision with a data center that restricts the disclosure of information related to the data center's water use. Contains provisions concerning data confidentiality and public access. Establishes penalties for violations. Grants the Illinois Environmental Protection Agency rulemaking powers.

Every action

22 steps, oldest first, as the legislature records them.

Show the 14 earlier steps
  1. SenateFiled with Secretary by Sen. Chapin Rose
  2. SenateFirst Reading
  3. CommitteeReferred to Assignments · Senate Assignments
  4. CommitteeAssigned to Executive · Senate Executive
  5. SenateTo AI and Social Media
  6. SenateRule 2-10 Committee Deadline Established As March 27, 2026
  7. SenateRule 2-10 Committee Deadline Established As April 24, 2026
  8. SenateRule 2-10 Committee/3rd Reading Deadline Established As May 15, 2026
  9. SenateSenate Committee Amendment No. 1 Filed with Secretary by Sen. Chapin Rose
  10. CommitteeSenate Committee Amendment No. 1 Referred to Assignments · Senate Assignments
  11. CommitteeSenate Committee Amendment No. 1 Assignments Refers to Executive · Senate Assignments
  12. CommitteeSenate Committee Amendment No. 1 To AI and Social Media · Senate AI and Social Media
  13. SenateRule 2-10 Committee/3rd Reading Deadline Established As May 22, 2026
  14. CommitteeRule 3-9(a) / Re-referred to Assignments · Senate Assignments
  1. CommitteeSenate Committee Amendment No. 1 Rule 3-9(a) / Re-referred to Assignments · Senate Assignments
  2. SenateAdded as Co-Sponsor Sen. Chris Balkema
  3. SenateAdded as Chief Co-Sponsor Sen. Sally J. Turner
  4. SenateAdded as Co-Sponsor Sen. Terri Bryant
  5. SenateAdded as Co-Sponsor Sen. Darby A. Hills
  6. SenateAdded as Co-Sponsor Sen. Sue Rezin
  7. SenateAdded as Co-Sponsor Sen. Erica Harriss
  8. SenateAdded as Co-Sponsor Sen. Paul Jacobs

Roll calls

No recorded votes on this bill yet.

Sponsors

The member who introduced it, joined by 7 cosponsors: 7 Republicans.

All 7 cosponsors

From Illinois's official records (www.ilga.gov), checked Nov 2, 2026. Text links go to the official versions; LegiList does not copy bill text.