Illinois 104th General Assembly Status: Introduced 7 R cosponsors

SB4004      — AQUIFER PROTECTION ACT

Last action — Added as Co-Sponsor Sen. Erica Harriss

  1. 1
    Introduced
  2. 2
    In Committee
  3. 3
    Passed Senate
  4. 4
    Passed House
  5. 5
    To Executive
  6. 6
    Enacted

This bill has been introduced in the Senate. Introduced February 06, 2026. It must pass committee before a floor vote.

Next likely step: a committee referral and hearing.

Odds of enactment

Low chance

Based on the sponsor, cosponsors, and committee posture, this bill has a low chance of becoming law.

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A statistical estimate from our own model of past outcomes — an insight, not a guarantee. Policymaking is volatile.

Prognosis

Not enough signal yet

Not enough signal yet to read this bill's trajectory — we surface a likelihood only once there's real movement (stage, sponsorship, committee, or votes) to point to.

Based on stage, sponsorship breadth, committee status, recorded votes, and cross-state momentum — a description of the observable signals, not a prediction.

In plain language

The bill restricts data centers from using water from the Mahomet Aquifer.

The legislation prohibits data centers from withdrawing groundwater from the Mahomet Aquifer starting in 2027. It requires existing centers to find alternative water sources and ensures transparency in water usage information.

What this means for you
  • Environment: This means environmental protections will be enhanced by limiting groundwater withdrawals from a key aquifer.

Summary

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.

Bill Text

We don't have the full text on file for this bill yet.

Read SB4004 on the official Illinois source →

Action History

  1. Added as Co-Sponsor Sen. Erica Harriss

  2. Added as Co-Sponsor Sen. Sue Rezin

  3. Added as Co-Sponsor Sen. Darby A. Hills

  4. Added as Co-Sponsor Sen. Terri Bryant

  5. Added as Chief Co-Sponsor Sen. Sally J. Turner

  6. Added as Co-Sponsor Sen. Chris Balkema

  7. Senate Committee Amendment No. 1 Rule 3-9(a) / Re-referred to Assignments

  8. Rule 3-9(a) / Re-referred to Assignments

  9. Rule 2-10 Committee/3rd Reading Deadline Established As May 22, 2026

  10. Senate Committee Amendment No. 1 To AI and Social Media

  11. Senate Committee Amendment No. 1 Assignments Refers to Executive

  12. Senate Committee Amendment No. 1 Referred to Assignments

  13. Senate Committee Amendment No. 1 Filed with Secretary by Sen. Chapin Rose

  14. Rule 2-10 Committee/3rd Reading Deadline Established As May 15, 2026

  15. Rule 2-10 Committee Deadline Established As April 24, 2026

  16. Rule 2-10 Committee Deadline Established As March 27, 2026

  17. To AI and Social Media

  18. Assigned to Executive

  19. Referred to Assignments

  20. First Reading

  21. Filed with Secretary by Sen. Chapin Rose

Sponsors

Sponsorship breakdown

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1 sponsors · 6 co-sponsors · 176 not signed on

Sponsors (1)

Co-sponsors (6)

Not signed on (176)

176 members have not signed on to this bill.

Show all 176 →

"Not signed on" means a member has not sponsored or co-sponsored this bill — it does not imply opposition. Members flagged Voted No have a recorded No vote on this bill.

Whip count is in markup. Polling the chamber and every recorded vote this session. Only the first open is slow. It’s instant for you after this. Calling the roll · Tallying · Engrossing

Subjects

environment technology
Cross-referencing the record. Reading this bill against every other bill in the corpus by meaning, not keywords. Only the first open is slow. It’s instant for you after this. Matching · Ranking · Engrossing

Frequently asked questions

What does SB4004      do?
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.
Who sponsors SB4004     ?
SB4004      is sponsored by Chapin Rose (Republican), Sally J. Turner (Republican), Chris Balkema (Republican), Terri Bryant (Republican), Darby A. Hills (Republican), Sue Rezin (Republican), and Erica Harriss (Republican).
What is the current status of SB4004     ?
This bill has been introduced in the Senate. Introduced February 06, 2026. It must pass committee before a floor vote.
Where can I track SB4004     ?
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Last checked for changes 3 months ago · updated continuously

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