US lawIllinoisRegulationsTitle 35 — ENVIRONMENTAL PROTECTIONCHAPTER I: POLLUTION CONTROL BOARDPart 309 — PERMITSSubpart A309.14535 Ill. Adm. Code 309.145Duration of PermitsLast amended: 2023Year: 2026Length: 21 wordsOfficial source Section 309 Section 309.145 Duration of Permits All NPDES Permits must be issued for fixed terms not to exceed five years.Previous35 Ill. Adm. Code 309.144Next35 Ill. Adm. Code 309.146