US lawIllinoisRegulationsTitle 35 — ENVIRONMENTAL PROTECTIONCHAPTER I: POLLUTION CONTROL BOARDPart 611 — PRIMARY DRINKING WATER STANDARDSSubpart P611.68335 Ill. Adm. Code 611.683Reduced Monitoring Frequency (Repealed)Last amended: 2004Year: 2026Length: 8 wordsOfficial source Section 611 Section 611.683 Reduced Monitoring Frequency (Repealed)Previous35 Ill. Adm. Code 611.680Next35 Ill. Adm. Code 611.684