US lawIllinoisRegulationsTitle 77 — PUBLIC HEALTHCHAPTER I: DEPARTMENT OF PUBLIC HEALTHSUBCHAPTER r: WATER AND SEWAGEPart 890 — ILLINOIS PLUMBING CODESubpart E890.55077 Ill. Adm. Code 890.550Backwater Valves – Sanitary System and Storm System (Repealed)Last amended: 2004Year: 2026Length: 13 wordsOfficial source Section 890 Section 890.550 Backwater Valves – Sanitary System and Storm System (Repealed)Previous77 Ill. Adm. Code 890.540