ILCS » Chapter 525 · Act 30
Illinois Compiled Statutes

525 ILCS 30/17 (2026)

All public agencies shall recognize that the protection of nature preserves, buffer areas and registered areas is the public policy of the State and shall avoid the planning of any action that would adversely affect them

✓ current as of May 2026
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(525 ILCS 30/17) (from Ch. 105, par. 717)
    Sec. 17. All public agencies shall recognize that the protection of nature preserves, buffer areas and registered areas is the public policy of the State and shall avoid the planning of any action that would adversely affect them.
    It shall be the public policy of each agency of State or local government to utilize its authority in furtherance of the purposes of this Act, and to evaluate, through a process of consultation with the Department, whether the actions, including capital projects, that are authorized, funded, or carried out by the agency of State or local government are likely to result in the destruction or adverse modification of any natural area that is registered under this Act or identified in the Illinois Natural Areas Inventory.
    The evaluation shall be conducted early in the planning of a proposed action. If the proposed action is found likely to have an adverse impact on a natural area, the agency shall study the proposed action to determine possible methods of eliminating or mitigating the adverse impact. Before implementing any action, the agency shall attempt to mitigate or eliminate any adverse impacts in a manner consistent with the planned action. The Department, Commission, or any affected person may seek a writ of mandamus to compel an agency of State or local government to engage in the evaluation and study required by this Section.
(Source: P.A. 88-139.)

    
Notes of Decisions
Cited in 8 cases (1 in the last 5 years), 1998–2024 · leading case: Pierce Downer's Heritage All. v. Vill. of Downers Grove, 704 N.E.2d 898 (Ill. App. Ct. 1998).
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Pierce Downer's Heritage All. v. Vill. of Downers Grove, 704 N.E.2d 898 (Ill. App. Ct. 1998). · cites it 22× “In its complaint, Alliance sought to compel defendants the Village of Downers Grove (Village) and the Illinois Health Facilities Planning Board (Board) to engage in an environmental consultation with the Illinois Department of Natural Resources (IDNR) pursuant to section 17 of…”
McHenry Cnty. Defenders, Inc. v. City of Harvard, 891 N.E.2d 1017 (Ill. App. Ct. 2008). · cites it 8× “, and Susan Hayden, brought an action under section 17 of the Illinois Natural Areas Preservation Act (Preservation Act) (525 ILCS 30/17 (West 2004)) and section 11(b) of the Illinois Endangered Species Protection Act (Endangered Species Act) (520 ILCS 10/11(b) (West 2004))…”
Stop Northpoint, LLC v. City of Joliet, 2024 IL App (3d) 220517 (Ill. App. Ct. 2024). “Upon receiving the parties’ submissions, the court found that “issues should be considered with regards to the provisions of the Illinois Natural Areas Preservation Act (525 ILCS 30/17) and *** McHenry County Defenders v.”
The Sierra Club v. The Off. of Mines & Minerals of the Dep't of Nat. Resources, 2015 IL App (4th) 140405 (Ill. App. Ct. 2015). “¶ 15 Count IV contended the Department defendants violated section 17 of the Preser- vation Act (525 ILCS 30/17 (West 2012)) by failing to fulfill consultation requirements.”
Sierra Club v. Off. of Mines & Minerals of the Dep't of Nat. Resources, 2015 IL App (4th) 140405 (Ill. App. Ct. 2015). · cites it 3× “In a March 2012 e-mail, Malone informed Falter Mississippi Sand’s surface-mining-permit application was reviewed in accordance with section 11 of the Illinois Endangered Species Protection Act (520 ILCS 10/11 (West 2012)), section 17 of the Illinois Natural Areas Preservation…”
Pierce Downer's Heritage All. v. Vill. of Downer's Grove (Ill. App. Ct. 1998). · cites it 11× “In its complaint, Alliance sought to compel defendants the Village of Downers Grove (Village) and the Illinois Health Facilities Planning Board (Board) to engage in an environmental consultation with the Illinois Department of Natural Resources (IDNR) pursuant to section 17 of…”
McHenry Cnty. Defenders v. City of Harvard (Ill. App. Ct. 2008). · cites it 7× “, and Susan Hayden, brought an action under section 17 of the Illinois Natural Areas Preservation Act (Preservation Act) (525 ILCS 30/17 (West 2004)) and section 11(b) of the Illinois Endangered Species Protection Act (Endangered Species Act) (520 ILCS 10/11(b) (West 2004))…”
Sierra Club v. Off. of Mines & Minerals of the Dep't of Nat. Resources, 2015 IL App (4th) 140405 (Ill. App. Ct. 2015). · cites it 2× “¶ 15 Count IV contended the Department defendants violated section 17 of the Preser- vation Act (525 ILCS 30/17 (West 2012)) by failing to fulfill consultation requirements.”
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