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SB4206 - 104th General Assembly

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104TH GENERAL ASSEMBLY
State of Illinois
2025 and 2026
SB4206

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.
LRB104 21947 TRT 37880 b

A BILL FOR

SB4206
LRB104 21947 TRT 37880 b
1

AN ACT concerning local government.

2

Be it enacted by the People of the State of Illinois,
3
represented in the General Assembly:

4

Section 5.
The Counties Code is amended by adding Section
5
5-12025 as follows:

6

(55 ILCS 5/5-12025 new)
7

Sec. 5-12025.
Data centers.
8

(a) For the purposes of this Section, "data center" means
9
a facility: (1) whose primary services are the storage,
10
management, and processing of digital data; and (2) that is
11
used to house (i) computer and network systems, including
12
associated components such as servers, network equipment and
13
appliances, telecommunications, and data storage systems, (ii)
14
systems for monitoring and managing infrastructure
15
performance, (iii) Internet-related equipment and services,
16
(iv) data communications connections, (v) environmental
17
controls, (vi) fire protection systems, and (vii) security
18
systems and services.

19

(b) A county may, by ordinance, establish standards for
20
the construction of data centers. The standards may include,
21
without limitation, the size, height, and design of structures
22
and the number of facilities that may be located within a
23
geographic area. A county may also regulate the siting of data

SB4206
- 2 -
LRB104 21947 TRT 37880 b
1
centers in unincorporated areas of the county outside of the
2
zoning jurisdiction of a municipality and the 1.5-mile radius
3
surrounding the zoning jurisdiction of a municipality. A
4
county may not allow the siting of a data center within 3 miles
5
of the corporate boundaries of another municipality unless the
6
corporate authorities of that municipality have granted prior
7
written consent. A county may establish additional standards
8
for data centers to protect the availability, sustainability,
9
and purity of water and other water resources, including
10
limitations on water withdrawal, requirements for water reuse
11
or conservation systems, and safeguards to prevent
12
contamination. A county may also establish additional
13
standards to mitigate noise pollution.
14

(c) There shall be at least one public hearing not more
15
than 30 days prior to a siting decision by the county board.
16
Notice of the hearing shall be published in a newspaper of
17
general circulation in the county.

18

(d) Notwithstanding any requirements of this Section, any
19
provision of a county zoning ordinance pertaining to data
20
centers that is in effect prior to the effective date of this
21
amendatory Act of the 104th General Assembly may remain in
22
effect.

23

Section 10.
The Illinois Municipal Code is amended by
24
adding Section 11-13-30 as follows:

SB4206
- 3 -
LRB104 21947 TRT 37880 b
1

(65 ILCS 5/11-13-30 new)
2

Sec. 11-13-30.
Data centers.

3

(a) For the purposes of this Section, "data center" means
4
a facility: (1) whose primary services are the storage,
5
management, and processing of digital data; and (2) that is
6
used to house (i) computer and network systems, including
7
associated components such as servers, network equipment and
8
appliances, telecommunications, and data storage systems, (ii)
9
systems for monitoring and managing infrastructure
10
performance, (iii) Internet-related equipment and services,
11
(iv) data communications connections, (v) environmental
12
controls, (vi) fire protection systems, and (vii) security
13
systems and services.

14

(b) A municipality may, by ordinance, regulate the siting
15
of data centers within the municipality's zoning jurisdiction
16
and within the 1.5-mile radius surrounding its zoning
17
jurisdiction. A municipality may not allow the siting of a
18
data center within 3 miles of the corporate boundaries of
19
another municipality unless the corporate authorities of that
20
municipality have granted prior written consent. A
21
municipality may establish additional standards for data
22
centers to protect the availability, sustainability, and
23
purity of water and other water resources, including
24
limitations on water withdrawal, requirements for water reuse
25
or conservation systems, and safeguards to prevent
26
contamination. A municipality may also establish additional

SB4206
- 4 -
LRB104 21947 TRT 37880 b
1
standards to mitigate noise pollution.
2

(c) There shall be at least one public hearing not more
3
than 30 days prior to a siting decision by the corporate
4
authorities of a municipality. Notice of the hearing shall be
5
published in a newspaper of general circulation in the
6
municipality.

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