US lawIllinoisRegulationsTitle 35 — ENVIRONMENTAL PROTECTIONCHAPTER I: POLLUTION CONTROL BOARDPart 302 — WATER QUALITY STANDARDSSubpart C302.30735 Ill. Adm. Code 302.307Radium 226 and 228Last amended: 2023Year: 2026Length: 23 wordsOfficial source Section 302.307 Radium 226 and 228 Radium 226 and 228 combined concentration must not exceed 5 picocuries per liter (pCi/L) at any time.Previous35 Ill. Adm. Code 302.306