US lawIllinoisRegulationsTitle 35 — ENVIRONMENTAL PROTECTIONCHAPTER II: ENVIRONMENTAL PROTECTION AGENCYPart 370 — ILLINOIS RECOMMENDED STANDARDS FOR SEWAGE WORKSSubpart I370.91035 Ill. Adm. Code 370.910Rotating Biological Contactors (Repealed)Last amended: 1997Year: 2026Length: 8 wordsOfficial source Section 370 Section 370.910 Rotating Biological Contactors (Repealed)Previous35 Ill. Adm. Code 370.900Next35 Ill. Adm. Code 370.915