US lawIllinoisRegulationsTitle 35 — ENVIRONMENTAL PROTECTIONCHAPTER I: POLLUTION CONTROL BOARDPart 301 — INTRODUCTION301.30035 Ill. Adm. Code 301.300Intrastate WatersYear: 2026Length: 18 wordsOfficial source Section 301 Section 301.300 Intrastate Waters "Intrastate Waters" are all waters of Illinois which are not interstate waters.Previous35 Ill. Adm. Code 301.295Next35 Ill. Adm. Code 301.301