US lawIllinoisRegulationsTitle 35 — ENVIRONMENTAL PROTECTIONCHAPTER I: POLLUTION CONTROL BOARDSUBCHAPTER d: UNDERGROUND INJECTION CONTROL AND UNDERGROUND STORAGE TANK PROGRAMSPart 731 — UNDERGROUND STORAGE TANKSSubpart D731.14435 Ill. Adm. Code 731.144Piping (Repealed)Last amended: 1992Year: 2026Length: 6 wordsOfficial source Section 731 Section 731.144 Piping (Repealed)Previous35 Ill. Adm. Code 731.143Next35 Ill. Adm. Code 731.145