US lawIllinoisRegulationsTitle 35 — ENVIRONMENTAL PROTECTIONCHAPTER I: POLLUTION CONTROL BOARDSUBCHAPTER a: PERMITS AND GENERAL PROVISIONSPart 203 — MAJOR STATIONARY SOURCES CONSTRUCTION AND MODIFICATIONSubpart I203.131035 Ill. Adm. Code 203.1310ProjectLast amended: 2025Year: 2026Length: 22 wordsOfficial source Section 203.1310 Project "Project" means a physical change in or change in the method of operation of an existing major stationary source.Previous35 Ill. Adm. Code 203.1300Next35 Ill. Adm. Code 203.1320