# Illinois SB4004: AQUIFER PROTECTION ACT

Illinois SB4004, AQUIFER PROTECTION ACT, is a 104th General Assembly (2025–2026) Senate bill sponsored by Chapin Rose (Republican); status in committee, last action 2026-09-02 (Added as Co-Sponsor Sen. Paul Jacobs) (as of 2026-11-01).

- Canonical: https://policyrisk.com/state-bill/IL-SB4004-2025-2026
- As of: 2026-11-01
- Plain-text twin of the page above; the HTML and this file carry the same facts.

## Facts
- Bill: Illinois SB4004
- State: Illinois
- Session: 104th General Assembly (2025–2026)
- Title: AQUIFER PROTECTION ACT
- Status: in committee
- Chamber: Senate
- Introduced: 2026-02-06
- Last action: 2026-09-02, Added as Co-Sponsor Sen. Paul Jacobs
- Sponsor: Chapin Rose (Republican)
- Cosponsors: 7
- Subjects: assignments, executive
- Touches household money: no
- Economic provisions PRIA read: 0

## 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 overview

No economic impacts identified for this bill.

## Sponsors and cosponsors

- Sponsor: Chapin Rose (Republican), Senate
- Cosponsor: Chris Balkema (Republican), Senate
- Cosponsor: Darby A. Hills (Republican), Senate
- Cosponsor: Erica Harriss (Republican), Senate
- Cosponsor: Paul Jacobs (Republican), Senate
- Cosponsor: Sally J. Turner (Republican), Senate
- Cosponsor: Sue Rezin (Republican), Senate
- Cosponsor: Terri Bryant (Republican), Senate

## Actions (22)

- 2026-09-02: Added as Co-Sponsor Sen. Paul Jacobs (Senate)
- 2026-06-17: Added as Co-Sponsor Sen. Erica Harriss (Senate)
- 2026-05-30: Added as Co-Sponsor Sen. Sue Rezin (Senate)
- 2026-05-30: Added as Co-Sponsor Sen. Darby A. Hills (Senate)
- 2026-05-29: Added as Co-Sponsor Sen. Terri Bryant (Senate)
- 2026-05-29: Added as Chief Co-Sponsor Sen. Sally J. Turner (Senate)
- 2026-05-28: Added as Co-Sponsor Sen. Chris Balkema (Senate)
- 2026-05-22: Senate Committee Amendment No. 1 Rule 3-9(a) / Re-referred to Assignments (Senate)
- 2026-05-22: Rule 3-9(a) / Re-referred to Assignments (Senate)
- 2026-05-15: Rule 2-10 Committee/3rd Reading Deadline Established As May 22, 2026 (Senate)
- 2026-05-06: Senate Committee Amendment No. 1 To AI and Social Media (Senate)
- 2026-05-06: Senate Committee Amendment No. 1 Assignments Refers to Executive (Senate)
- 2026-05-05: Senate Committee Amendment No. 1 Referred to Assignments (Senate)
- 2026-05-05: Senate Committee Amendment No. 1 Filed with Secretary by Sen. Chapin Rose (Senate)
- 2026-04-24: Rule 2-10 Committee/3rd Reading Deadline Established As May 15, 2026 (Senate)
- 2026-03-27: Rule 2-10 Committee Deadline Established As April 24, 2026 (Senate)
- 2026-03-13: Rule 2-10 Committee Deadline Established As March 27, 2026 (Senate)
- 2026-02-25: To AI and Social Media (Senate)
- 2026-02-24: Assigned to Executive (Senate)
- 2026-02-06: Referred to Assignments (Senate)
- 2026-02-06: First Reading (Senate)
- 2026-02-06: Filed with Secretary by Sen. Chapin Rose (Senate)

## Bill text

- Introduced: [PDF](https://www.ilga.gov/documents/legislation/104/SB/PDF/10400SB4004.pdf)
- Senate Amendment 1: [PDF](https://www.ilga.gov/documents/legislation/104/SB/PDF/10400SB4004sam001.pdf)

## Related bills

- HB5198: AFFORDABLE HOUSING-CILAS (passed house)
- SB1937: PENSION CODE-VARIOUS (passed senate)
- HB2563: CONDO-RESERVE STUDY (in committee)
- HB4701: LIMITATIONS FACILITY FEES ACT (in committee)
- SB3008: DHS-ABLE PROGRAM INFO MATERIAL (passed senate)
- SB3484: VEH CD-PLATES-REGISTRATION (signed)

## Sources
- [Introduced (PDF)](https://www.ilga.gov/documents/legislation/104/SB/PDF/10400SB4004.pdf)
- [Senate Amendment 1 (PDF)](https://www.ilga.gov/documents/legislation/104/SB/PDF/10400SB4004sam001.pdf)

## Related
- [HB5198: AFFORDABLE HOUSING-CILAS](https://policyrisk.com/state-bill/IL-HB5198-2025-2026)
- [SB1937: PENSION CODE-VARIOUS](https://policyrisk.com/state-bill/IL-SB1937-2025-2026)
- [HB2563: CONDO-RESERVE STUDY](https://policyrisk.com/state-bill/IL-HB2563-2025-2026)
- [HB4701: LIMITATIONS FACILITY FEES ACT](https://policyrisk.com/state-bill/IL-HB4701-2025-2026)
- [SB3008: DHS-ABLE PROGRAM INFO MATERIAL](https://policyrisk.com/state-bill/IL-SB3008-2025-2026)
- [SB3484: VEH CD-PLATES-REGISTRATION](https://policyrisk.com/state-bill/IL-SB3484-2025-2026)
- [Illinois bills](https://policyrisk.com/states/illinois/bills)
- [Illinois state hub](https://policyrisk.com/states/illinois)
- [All state legislation](https://policyrisk.com/state-bills)

Source: PRIA, https://policyrisk.com/state-bill/IL-SB4004-2025-2026 (as of 2026-11-01).