US lawIllinoisRegulationsTitle 35 — ENVIRONMENTAL PROTECTIONCHAPTER I: POLLUTION CONTROL BOARDSUBCHAPTER d: UNDERGROUND INJECTION CONTROL AND UNDERGROUND STORAGE TANK PROGRAMSPart 731 — UNDERGROUND STORAGE TANKSSubpart G731.17135 Ill. Adm. Code 731.171Permanent Closure and Changes-in-service (Repealed)Last amended: 1992Year: 2026Length: 9 wordsOfficial source Section 731 Section 731.171 Permanent Closure and Changes-in-service (Repealed)Previous35 Ill. Adm. Code 731.170Next35 Ill. Adm. Code 731.172