Bill Text: IL SB4206 | 2025-2026 | 104th General Assembly | Introduced

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Bill Title: Amends the Counties Code. Allows a county to establish standards for the construction of data centers by ordinance. Provides that the standards may include, without limitation, the size, height, and design of structures and the number of facilities that may be located within a geographic area. Provides that a county may regulate the siting of data centers in unincorporated areas of the county outside of the zoning jurisdiction of a municipality and the 1.5-mile radius surrounding the zoning jurisdiction of a municipality and may establish other specified standards. Sets forth provisions concerning notice and hearings. Provides that any provision of a county zoning ordinance pertaining to data centers that is in effect prior to the effective date may remain in effect. Amends the Illinois Municipal Code. Provides that a municipality may, by ordinance, regulate the siting of data centers within the municipality's zoning jurisdiction and within the 1.5-mile radius surrounding its zoning jurisdiction and may establish other specified standards. Sets forth provisions concerning notice and hearings.

Sponsorship: Partisan Bill (Republican 1)

Status: (Introduced) 2026-05-18 - Referred to Assignments [SB4206 Detail]

Download: Illinois-2025-SB4206-Introduced.html

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104TH GENERAL ASSEMBLY State of Illinois 2025 and 2026SB4206 Introduced 5/18/2026, by Sen. Darby A. Hills SYNOPSIS AS INTRODUCED:
55 ILCS 5/5-12025 new
65 ILCS 5/11-13-30 new
Amends the Counties Code. Allows a county to establish standards for the construction of data centers by ordinance. Provides that the standards may include, without limitation, the size, height, and design of structures and the number of facilities that may be located within a geographic area. Provides that a county may regulate the siting of data centers in unincorporated areas of the county outside of the zoning jurisdiction of a municipality and the 1.5-mile radius surrounding the zoning jurisdiction of a municipality and may establish other specified standards. Sets forth provisions concerning notice and hearings. Provides that any provision of a county zoning ordinance pertaining to data centers that is in effect prior to the effective date may remain in effect. Amends the Illinois Municipal Code. Provides that a municipality may, by ordinance, regulate the siting of data centers within the municipality's zoning jurisdiction and within the 1.5-mile radius surrounding its zoning jurisdiction and may establish other specified standards. Sets forth provisions concerning notice and hearings.
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A BILL FOR
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AN ACT concerning local government.
Be it enacted by the People of the State of Illinois,
represented in the General Assembly:
Section 5. The Counties Code is amended by adding Section
5-12025 as follows:
(55 ILCS 5/5-12025 new)
Sec. 5-12025. Data centers.
(a) For the purposes of this Section, "data center" means
a facility: (1) whose primary services are the storage,
management, and processing of digital data; and (2) that is
used to house (i) computer and network systems, including
associated components such as servers, network equipment and
appliances, telecommunications, and data storage systems, (ii)
systems for monitoring and managing infrastructure
performance, (iii) Internet-related equipment and services,
(iv) data communications connections, (v) environmental
controls, (vi) fire protection systems, and (vii) security
systems and services.
(b) A county may, by ordinance, establish standards for
the construction of data centers. The standards may include,
without limitation, the size, height, and design of structures
and the number of facilities that may be located within a
geographic area. A county may also regulate the siting of data

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centers in unincorporated areas of the county outside of the
zoning jurisdiction of a municipality and the 1.5-mile radius
surrounding the zoning jurisdiction of a municipality. A
county may not allow the siting of a data center within 3 miles
of the corporate boundaries of another municipality unless the
corporate authorities of that municipality have granted prior
written consent. A county may establish additional standards
for data centers to protect the availability, sustainability,
and purity of water and other water resources, including
limitations on water withdrawal, requirements for water reuse
or conservation systems, and safeguards to prevent
contamination. A county may also establish additional
standards to mitigate noise pollution.
(c) There shall be at least one public hearing not more
than 30 days prior to a siting decision by the county board.
Notice of the hearing shall be published in a newspaper of
general circulation in the county.
(d) Notwithstanding any requirements of this Section, any
provision of a county zoning ordinance pertaining to data
centers that is in effect prior to the effective date of this
amendatory Act of the 104th General Assembly may remain in
effect.
Section 10. The Illinois Municipal Code is amended by
adding Section 11-13-30 as follows:

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(65 ILCS 5/11-13-30 new)
Sec. 11-13-30. Data centers.
(a) For the purposes of this Section, "data center" means
a facility: (1) whose primary services are the storage,
management, and processing of digital data; and (2) that is
used to house (i) computer and network systems, including
associated components such as servers, network equipment and
appliances, telecommunications, and data storage systems, (ii)
systems for monitoring and managing infrastructure
performance, (iii) Internet-related equipment and services,
(iv) data communications connections, (v) environmental
controls, (vi) fire protection systems, and (vii) security
systems and services.
(b) A municipality may, by ordinance, regulate the siting
of data centers within the municipality's zoning jurisdiction
and within the 1.5-mile radius surrounding its zoning
jurisdiction. A municipality may not allow the siting of a
data center within 3 miles of the corporate boundaries of
another municipality unless the corporate authorities of that
municipality have granted prior written consent. A
municipality may establish additional standards for data
centers to protect the availability, sustainability, and
purity of water and other water resources, including
limitations on water withdrawal, requirements for water reuse
or conservation systems, and safeguards to prevent
contamination. A municipality may also establish additional

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standards to mitigate noise pollution.
(c) There shall be at least one public hearing not more
than 30 days prior to a siting decision by the corporate
authorities of a municipality. Notice of the hearing shall be
published in a newspaper of general circulation in the
municipality.