ADMINISTRATIVE CODE

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  3. TITLE 35: ENVIRONMENTAL PROTECTION
  4. CHAPTER II: ENVIRONMENTAL PROTECTION AGENCY
TITLE 35: ENVIRONMENTAL PROTECTION
SUBTITLE F: PUBLIC WATER SUPPLIES
CHAPTER II: ENVIRONMENTAL PROTECTION AGENCY
PART 671 MAXIMUM SETBACK ZONE FOR COMMUNITY WATER SUPPLY WELLS
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SUBPART A: INTRODUCTION

Section 671.101 Purpose
Section 671.102 Definitions
Section 671.103 Severability
Section 671.104 Agency Mailing Address

SUBPART B: PROCEDURES FOR DETERMINING THE LATERAL AREA OF INFLUENCE OF WELLS UNDER NORMAL OPERATIONAL CONDITIONS

Section 671.201 Estimation Techniques and Pumping Test
Section 671.202 Agency Approval of Alternate Estimation Techniques, Pump Tests, or Other Procedures

SUBPART C: REQUESTS FOR AGENCY REVIEW AND CONFIRMATION

Section 671.301 General
Section 671.302 Contents of a Request
Section 671.303 Agency Approval of Alternate Certification
Section 671.304 Agency Review and Confirmation
Section 671.305 Adoption of a Maximum Setback Zone Ordinance
Section 671.306 Changing a Maximum Setback Zone

Section 671.APPENDIX A Volumetric Flow Equation
Section 671.APPENDIX B Theis Equation Using Available Data
Section 671.APPENDIX C Todd Uniform Flow Equation
Section 671.APPENDIX D Neuman Equations and Pump Test Procedures for Unconfined or Water Table Aquifers
Section 671.APPENDIX E Theis Equations And Pump Test Procedures for Confined Aquifers
Section 671.APPENDIX F Hydrogeologic Mapping
Section 671.TABLE A Well Functions for Confined Aquifers
Section 671.TABLE B Well Functions for Unconfined or Water Table Aquifers
AUTHORITY: Implementing and authorized by Section 14.3 of the Environmental Protection Act [415 ILCS 5/14.3].
SOURCE: Adopted at 12 Ill. Reg. 14134, effective August 25, 1988; amended at 49 Ill. Reg. 16213, effective December 4, 2025.