US lawIllinoisRegulationsTitle 35 — ENVIRONMENTAL PROTECTIONCHAPTER I: POLLUTION CONTROL BOARDPart 303 — WATER USE DESIGNATIONS AND SITE-SPECIFIC WATER QUALITY STANDARDSSubpart B303.20335 Ill. Adm. Code 303.203Underground WatersLast amended: 1992Year: 2026Length: 29 wordsOfficial source Section 303 Section 303.203 Underground Waters 35 Ill. Adm. Code 302.Subparts B and C do not apply to underground waters, except as provided at 35 Ill. Adm. Code 620.450(b).Previous35 Ill. Adm. Code 303.202Next35 Ill. Adm. Code 303.204