ADMINISTRATIVE CODE

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  3. TITLE 35: ENVIRONMENTAL PROTECTION
  4. CHAPTER II: ENVIRONMENTAL PROTECTION AGENCY
TITLE 35: ENVIRONMENTAL PROTECTION
SUBTITLE C: WATER POLLUTION
CHAPTER II: ENVIRONMENTAL PROTECTION AGENCY
PART 375 COMBINED SEWER OVERFLOW EXCEPTION CRITERIA AND FIRST FLUSH DETERMINATION
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SUBPART A: INTRODUCTION

Section 375.101 Policy
Section 375.102 Definitions
Section 375.103 Prohibitions

SUBPART B: WATER QUALITY INVESTIGATION

Section 375.201 Policy
Section 375.202 Phase I – Background Information
Section 375.203 Phase II – Preliminary Stream Inspection
Section 375.204 Phase III – Detailed Water Quality Evaluation
Section 375.205 Special Analysis for Congested Areas
Section 375.206 Time Schedule

SUBPART C: ASSESSMENT OF CONTROL OPTIONS

Section 375.301 Water Quality Evaluation
Section 375.302 Control Alternatives
Section 375.303 Benefits Assessment

SUBPART D: FIRST FLUSH DETERMINATION

Section 375.401 Variables in First Flush Determination
Section 375.402 Conditions for Determination
Section 375.403 Field Studies
Section 375.404 Modeling

Section 375.APPENDIX A First Flush Graph
AUTHORITY: Implementing and authorized by Sections 4 and 12(a) of the Environmental Protection Act [415 ILCS 5/4 and 5/12.2].
SOURCE: Adopted and Codified at 7 Ill. Reg. 10808, effective August 23, 1983; amended at 8 Ill. Reg. 19436, effective September 26, 1984; amended at 49 Ill. Reg. 16200, effective December 4, 2025.