US lawIllinoisRegulationsTitle 35 — ENVIRONMENTAL PROTECTIONCHAPTER I: POLLUTION CONTROL BOARDPart 611 — PRIMARY DRINKING WATER STANDARDSSubpart B611.23035 Ill. Adm. Code 611.230Filtration Effective Dates (Repealed)Last amended: 2023Year: 2026Length: 8 wordsOfficial source Section 611 Section 611.230 Filtration Effective Dates (Repealed)Previous35 Ill. Adm. Code 611.220Next35 Ill. Adm. Code 611.231