US lawIllinoisRegulationsTitle 35 — ENVIRONMENTAL PROTECTIONCHAPTER I: POLLUTION CONTROL BOARDPart 301 — INTRODUCTION301.23035 Ill. Adm. Code 301.230BasinYear: 2026Length: 16 wordsOfficial source Section 301 Section 301.230 Basin "Basin" means the area tributary to the designated body of water.Previous35 Ill. Adm. Code 301.225Next35 Ill. Adm. Code 301.231