Ill. Admin. Code tit. 35, pt. 671

Maximum Setback Zone for Community Water Supply Wells

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.ENVIRONMENTAL PROTECTION AGENCY

671.101Purpose 671.102Definitions 671.103Severability 671.104Agency Mailing Address 671.201Estimation Techniques and Pumping Test 671.202Agency Approval of Alternate Estimation Techniques, Pump Tests, or Other Procedures 671.301General 671.302Contents of a Request 671.303Agency Approval of Alternate Certification 671.304Agency Review and Confirmation 671.305Adoption of a Maximum Setback Zone Ordinance 671.306Changing a Maximum Setback Zone 671.APPENDIX AVolumetric Flow Equation 671.APPENDIX BTheis Equation Using Available Data 671.APPENDIX CTodd Uniform Flow Equation 671.APPENDIX DNeuman Equations and Pump Test Procedures for Unconfined or Water Table Aquifers 671.APPENDIX ETheis Equations And Pump Test Procedures for Confined Aquifers 671.APPENDIX FHydrogeologic Mapping 671.TABLE AWell Functions for Confined Aquifers 671.TABLE BWell Functions for Unconfined or Water Table Aquifers