US lawIllinoisRegulationsTitle 35 — ENVIRONMENTAL PROTECTIONCHAPTER I: POLLUTION CONTROL BOARDPart 301 — INTRODUCTION301.25535 Ill. Adm. Code 301.255Combined SewerLast amended: 1979Year: 2026Length: 21 wordsOfficial source Section 301 Section 301.255 Combined Sewer "Combined Sewer" means a sewer designed and constructed to receive both wastewater and land runoff.Previous35 Ill. Adm. Code 301.250Next35 Ill. Adm. Code 301.260