TITLE 35: ENVIRONMENTAL PROTECTION SUBTITLE C: WATER POLLUTION CHAPTER I: POLLUTION CONTROL BOARD PART 303 WATER USE DESIGNATIONS AND SITE-SPECIFIC WATER QUALITY STANDARDS 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 PROVISIONS Section 303.100 Scope and Applicability Section 303.101 Multiple Designations Section 303.102 Rulemaking Required (Repealed) SUBPART B: NONSPECIFIC WATER USE DESIGNATIONS Section 303.200 Scope and Applicability Section 303.201 General Use Waters Section 303.202 Public and Food Processing Water Supplies Section 303.203 Underground Waters Section 303.204 Chicago Area Waterway System and Lower Des Plaines River Section 303.205 Outstanding Resource Waters Section 303.206 List of Outstanding Resource Waters Section 303.220 Primary Contact Recreation Waters Section 303.225 Incidental Contact Recreation Waters Section 303.227 Non-Contact Recreation Waters and Non-Recreational Waters Section 303.230 Upper Dresden Island Pool Aquatic Life Use Waters Section 303.235 Chicago Area Waterway System Aquatic Life Use A Waters Section 303.240 Chicago Area Waterway System and Brandon Pool Aquatic Life Use B Waters SUBPART C: SPECIFIC USE DESIGNATIONS AND SITE SPECIFIC WATER QUALITY STANDARDS Section 303.300 Scope and Applicability Section 303.301 Organization Section 303.311 Ohio River Temperature Section 303.312 Waters Receiving Fluorspar Mine Drainage (Repealed) Section 303.321 Wabash River Temperature Section 303.322 Unnamed Tributary of the Vermilion River (Repealed) Section 303.323 Sugar Creek and Its Unnamed Tributary Section 303.326 Unnamed Tributary of Salt Creek, Salt Creek, and Little Wabash River Section 303.331 Mississippi River North Temperature Section 303.341 Mississippi River North Central Temperature Section 303.351 Mississippi River South Central Temperature Section 303.352 Unnamed Tributary of Wood River Creek Section 303.353 Schoenberger Creek; Unnamed Tributary of Cahokia Canal Section 303.361 Mississippi River South Temperature Section 303.400 Bankline Disposal Along the Illinois Waterway/River Section 303.410 Chronic Nickel Water Quality Standard for Segment of the Sangamon River Section 303.430 Unnamed Tributary to Dutch Creek (Repealed) Section 303.431 Long Point Slough and Its Unnamed Tributary (Repealed) Section 303.441 Secondary Contact Waters (Repealed) Section 303.442 Waters Not Designated for Public Water Supply Section 303.443 Lake Michigan Basin Section 303.444 Salt Creek, Higgins Creek, West Branch of the DuPage River, Des Plaines River Section 303.445 Total Dissolved Solids Water Quality Standard for the Lower Des Plaines River (Repealed) Section 303.446 Boron Water Quality Standard for Segments of the Sangamon River and the Illinois River Section 303.447 Unnamed Tributary of the South Branch Edwards River and South Branch Edwards River (Repealed) Section 303.448 Mud Run Creek (Repealed) Section 303.449 Chicago Sanitary and Ship Canal SUBPART D: THERMAL DISCHARGES Section 303.500 Scope and Applicability Section 303.502 Lake Sangchris Thermal Discharges Section 303.APPENDIX A References to Previous Rules (Repealed) Section 303.APPENDIX B Sources of Codified Section (Repealed)

AUTHORITY: Implementing Section 13 and authorized by Sections 11(b), 27, and 28 of the Environmental Protection Act [415 ILCS 5/11(b), 13, 27, and 28].

SOURCE: Filed with the Secretary of State January 1, 1978; amended at 2 Ill. Reg. 27, p. 221, effective July 5, 1978; amended at 3 Ill. Reg. 20, p. 95, effective May 17, 1979; amended at 5 Ill. Reg. 11592, effective October 19, 1981; codified at 6 Ill. Reg. 7818; amended at 6 Ill. Reg. 11161, effective September 7, 1982; amended at 7 Ill. Reg. 8111, effective June 23, 1983; amended in R87-27 at 12 Ill. Reg. 9917, effective May 27, 1988; amended in R87-2 at 13 Ill. Reg. 15649, effective September 22, 1989; amended in R87-36 at 14 Ill. Reg. 9460, effective May 31, 1990; amended in R86-14 at 14 Ill. Reg. 20724, effective December 18, 1990; amended in R89-14(C) at 16 Ill. Reg. 14684, effective September 10, 1992; amended in R92-17 at 18 Ill. Reg. 2981, effective February 14, 1994; amended in R91-23 at 18 Ill. Reg. 13457, effective August 19, 1994; amended in R93-13 at 19 Ill. Reg. 1310, effective January 30, 1995; amended in R95-14 at 20 Ill. Reg. 3534, effective February 8, 1996; amended in R97-25 at 22 Ill. Reg. 1403, effective December 24, 1997; amended in R01-13 at 26 Ill. Reg. 3517, effective February 22, 2002; amended in R03-11 at 28 Ill. Reg. 3071, effective February 4, 2004; amended in R06-24 at 31 Ill. Reg. 4440, effective February 27, 2007; amended in R09-8 at 33 Ill. Reg. 7903, effective May 29, 2009; amended in R09-11 at 33 Ill. Reg. 12258, effective August 11, 2009; amended in R08-9(A) at 35 Ill. Reg. 15078, effective August 23, 2011; amended in R11-18 at 36 Ill. Reg. 18898, effective December 12, 2012; amended in R08-9(C) at 38 Ill. Reg. 5517, effective February 13, 2014; amended in R08-09(D) at 39 Ill. Reg. 9423, effective July 1, 2015; amended in R14-24 at 42 Ill. Reg. 20947, effective November 19, 2018; amended in R18-23 at 47 Ill. Reg. 4575, effective March 23, 2023.