TITLE 35: ENVIRONMENTAL PROTECTION SUBTITLE F: PUBLIC WATER SUPPLIES CHAPTER I: POLLUTION CONTROL BOARD PART 620 GROUNDWATER QUALITY The General Assembly's Illinois Administrative Code database includes only those rulemakings that have been permanently adopted. This menu will point out the Sections on which an emergency rule (valid for a maximum of 150 days, usually until replaced by a permanent rulemaking) exists. The emergency rulemaking is linked through the notation that follows the Section heading in the menu. View Entire Part SUBPART A: GENERAL Section 620.105 Purpose Section 620.110 Definitions Section 620.115 Prohibition Section 620.125 Incorporations by Reference Section 620.130 Exemption from General Use Standards and Public and Food Processing Water Supply Standards Section 620.135 Exclusion for Underground Water in Certain Man-Made Conduits SUBPART B: GROUNDWATER CLASSIFICATION Section 620.201 Groundwater Designations Section 620.210 Class I: Potable Resource Groundwater Section 620.220 Class II: General Resource Groundwater Section 620.230 Class III: Special Resource Groundwater Section 620.240 Class IV: Other Groundwater Section 620.250 Groundwater Management Zone Section 620.260 Reclassification of Groundwater by Adjusted Standard SUBPART C: NONDEGRADATION PROVISIONS FOR APPROPRIATE GROUNDWATERS Section 620.301 General Prohibition Against Use Impairment of Resource Groundwater Section 620.302 Applicability of Preventive Notification and Preventive Response Activities Section 620.305 Preventive Notification Procedures Section 620.310 Preventive Response Activities SUBPART D: GROUNDWATER QUALITY STANDARDS Section 620.401 Applicability Section 620.405 General Prohibitions Against Violations of Groundwater Quality Standards Section 620.410 Groundwater Quality Standards for Class I: Potable Resource Groundwater Section 620.420 Groundwater Quality Standards for Class II: General Resource Groundwater Section 620.430 Groundwater Quality Standards for Class III: Special Resource Groundwater Section 620.440 Groundwater Quality Standards for Class IV: Other Groundwater Section 620.450 Alternative Groundwater Quality Standards SUBPART E: GROUNDWATER MONITORING AND ANALYTICAL PROCEDURES Section 620.505 Compliance Determination Section 620.510 Monitoring and Analytical Requirements SUBPART F: HEALTH ADVISORIES Section 620.601 Purpose of a Health Advisory Section 620.605 Issuance of a Health Advisory Section 620.610 Publishing Health Advisories Section 620.615 Additional Health Advice for Mixtures of Similar-Acting Substances Section 620.APPENDIX A Procedures for Determining Human Threshold Toxicant Advisory Concentration for Class I: Potable Resource Groundwater Section 620.APPENDIX B Procedures for Determining Hazard Indices for Class I: Potable Resource Groundwater for Mixtures of Similar-Acting Substances Section 620.APPENDIX C Guidelines for Determining When Dose Addition of Similar-Acting Substances in Class I: Potable Resource Groundwaters is Appropriate Section 620.APPENDIX D Confirmation of an Adequate Corrective Action Pursuant to 35 Ill. Adm. Code 620.250(a)(2)

AUTHORITY: Implementing and authorized by Section 8 of the Illinois Groundwater Protection Act [415 ILCS 55/8] and authorized by Section 27 of the Illinois Environmental Protection Act [415 ILCS 5/27].

SOURCE: Adopted in R89-14(B) at 15 Ill. Reg. 17614, effective November 25, 1991; amended in R89-14(C) at 16 Ill. Reg. 14667, effective September 11, 1992; amended in R93-27 at 18 Ill. Reg. 14084, effective August 24, 1994; amended in R96-18 at 21 Ill. Reg. 6518, effective May 8, 1997; amended in R97-11 at 21 Ill. Reg. 7869, effective July 1, 1997; amended in R01-14 at 26 Ill. Reg. 2662, effective February 5, 2002; amended in R08-18 at 36 Ill. Reg. 15206, effective October 5, 2012; amended in R08-18(B) at 37 Ill. Reg. 16529, effective October 7, 2013.