Illinois Administrative Code

Section 303.449 Chicago Sanitary and Ship Canal The numeric water quality standards for chloride and Total Dissolved Solids in 35 Ill. Adm. Code 302.407(g) do not apply to the Chicago Sanitary and Ship Canal from December 1 through April 30 for the protection of aquatic organisms…

Section 303.500 Scope and Applicability Subpart D contains site-specific water quality-based thermal discharge standards. These are now determined without rulemaking under 35 Ill. Adm. Code 302.211 and 35 Ill. Adm. Code 106. (Source: Amended at 47 Ill. Reg. 4575, effective March …

Section 303.502 Lake Sangchris Thermal Discharges The thermal discharge to Lake Sangchris must meet the following standards and conditions: The effluent temperature must not exceed 37 ºC (99 ºF) during more than 7% of the hours in the 12-month period ending with any month and mus…

Section 303.APPENDIX A References to Previous Rules (Repealed) (Source: Repealed at 47 Ill. Reg. 4575, effective March 23, 2023)

Section 304.101 Preamble This Part establishes the maximum concentrations of various contaminants that may be discharged into the waters of the State. Subpart A contains general effluent limitations. Subpart B contains site-specific rules and exceptions not of general applicabili…

Section 304.102 Dilution a) Diluting the effluent from a treatment works or any wastewater source is not acceptable as a method of treatment of wastes to meet the standards in this Part. It is the obligation of any person discharging contaminants of any kind into the waters of th…

Section 304.103 Background Concentrations Because the effluent standards in this Part are based on concentrations achievable with conventional treatment technology that is largely unaffected by ordinary levels of contaminants in intake water, they are absolute standards that must…

Section 304.104 Averaging a) Except as otherwise specifically provided, proof of violation of the numerical standards of this Part must be based on one or more of the following averaging rules: 1) A monthly average must not exceed the prescribed numerical standard. 2) A daily com…

Section 304.105 Violation of Water Quality Standards In addition to the other requirements of this Part, effluent must not, alone or in combination with other sources, cause a violation of any applicable water quality standard. When the Agency finds that a discharge that would co…

Section 304.106 Offensive Discharges In addition to the other requirements of this Part, effluent must not contain settleable solids, floating debris, visible oil, grease, scum or sludge solids. Color, odor and turbidity must be reduced to below obvious levels. (Source: Amended a…

Section 304.120 Deoxygenating Wastes Except as provided in 35 Ill. Adm. Code 306.Subpart C, all effluents containing deoxygenating wastes must meet the following standards: a) Effluents must not exceed 30 mg/L of five-day biochemical oxygen demand (BOD5) or 30 mg/L of suspended s…

Section 304.121 Bacteria a) Effluents discharged to all general use waters must not exceed 400 fecal coliforms per 100 ml unless the Illinois Environmental Protection Agency determines that an alternative effluent standard is applicable under subsection (b). b) The Agency must, a…

Section 304.122 Total Ammonia Nitrogen a) Effluent from any source that discharges into the Illinois River, the Des Plaines River downstream of its confluence with the Chicago River System, or the Calumet River System, and whose untreated waste load is 50,000 or more population e…

Section 304.123 Phosphorus a) Effluents discharged within the Lake Michigan Basin must not contain more than 1.0 mg/L of phosphorus as P. b) Effluents from any source that discharges to a lake or reservoir with a surface area of 8.1 hectares (20 acres) or more, or to any tributar…

Section 304.124 Additional Contaminants a) A person must not cause or allow the concentration of the following constituents in any effluent to exceed the following levels, subject to the averaging rules in Section 304.104(a). CONSTITUENT CONCENTRATION mg/L Arsenic 0.25 Barium 2.0…

Section 304.125 pH a) Except as provided below a person must not cause or allow the negative logarithm of the hydrogen ion concentration (pH) in any effluent to be more or less respectively than the maximum and minimum values for pH range indicated in the following table: CONSTIT…

Section 304.126 Mercury a) Except as provided below, a person must not cause or allow the concentration of mercury in any effluent to exceed the following level, subject to the averaging rule contained in Section 304.104(a). CONSTITUENT CONCENTRATION mg/L Mercury 0.0005 b) It is …

Section 304.140 Delays in Upgrading (Repealed) (Source: Repealed at R88-1 at 13 Ill. Reg. 5976, effective April 18, 1989)

Section 304.141 NPDES Effluent Standards a) A person that has been issued an NPDES Permit must not discharge any contaminant in its effluent in excess of the standards and limitations for that contaminant in its permit. b) A person must not discharge any pollutant subject to, or …

Section 304.142 New Source Performance Standards (Repealed) (Source: Repealed at 8 Ill. Reg. 1600, effective January 18, 1984) SUBPART B: SITE SPECIFIC RULES AND EXCEPTIONS NOT OF GENERAL APPLICABILITY

Section 304.201 Wastewater Treatment Plant Discharges of The Metropolitan Water Reclamation District of Greater Chicago a) Calumet Treatment Plant Discharges: The effluent standards of Section 304.124 as applied to cyanide discharges, Section 304.120(b) and (c), and Section 304.1…

Section 304.202 Chlor-alkali Mercury Discharges in St. Clair County The mercury discharge standards of Section 304.124 and 35 Ill. Adm. Code 307.1102 do not apply to any manufacturing facility that operates chlor-alkali cells, is located in St. Clair County, and discharges direct…

Section 304.203 Copper Discharges by Olin Corporation This Section applies to an existing facility owned by Olin Corporation which discharges to Wood River Creek and the East Fork of Wood River Creek in Madison County. The facility's discharges are not subject to Section 304.105 …

Section 304.204 Schoenberger Creek: Groundwater Discharges a) This rule applies to discharges from an existing facility owned by Pfizer Corporation to Schoenberger Creek immediately south of the Baltimore and Ohio main tracks in T2N, R9W of the 3rd P.M., St. Clair County. b) This…

Section 304.205 John Deere Foundry Discharges (Repealed) (Source: Repealed at 47 Ill. Reg. 4601, effective March 23, 2023)

Section 304.206 Alton Water Company Treatment Plant Discharges This Section applies to the existing 18.3 million gallons per day potable drinking water treatment plant owned by the Alton Water Company, which is located at, and discharges into, river mile 204.4 on the Mississippi …

Section 304.207 Galesburg Sanitary District Deoxygenating Wastes Discharges a) The deoxygenating wastes general effluent standards of Section 304.120(c) do not apply to the Galesburg Sanitary District discharges into Cedar Creek. These discharges must meet the deoxygenating waste…

Section 304.208 City of Lockport Treatment Plant Discharges a) This Section applies only to discharges from the City of Lockport's sewage treatment plant into Deep Run Creek in Will County, Illinois. b) The provisions of Section 304.120 do not apply to the discharges if the disch…

Section 304.209 Wood River Station Total Suspended Solids Discharges The limitation on the discharge of Total Suspended Solids contained in Section 304.124(a) does not apply to the discharge from the ash pond system of CTI Development LLC's Wood River Station, located in East Alt…

Section 304.210 Alton Wastewater Treatment Plant Discharges The discharge from the City of Alton's sewage treatment works outfall 001 sewer located on Wood River Creek, approximately 1,000 feet from its confluence with the Mississippi River, is not subject to Section 304.120(c). …

Section 304.211 Discharges From Borden Chemicals and Plastics Operating Limited Partnership Into an Unnamed Tributary of Long Point Slough (Repealed) (Source: Repealed at 47 Ill. Reg. 4601, effective March 23, 2023)

Section 304.212 Sanitary District of Decatur Discharges a) This Section applies only to effluent discharges from the Sanitary District of Decatur's Sewage Treatment Plant into the Sangamon River, Macon County, Illinois. b) The provisions of Section 304.120(c) do not apply to the …

Section 304.213 PDV Midwest Refining, L.L.C. Refinery Ammonia Discharge (Repealed) (Source: Repealed at 47 Ill. Reg. 4601, effective March 23, 2023)

Section 304.214 Mobil Oil Refinery Ammonia Discharge (Repealed) (Source: Repealed at 47 Ill. Reg. 4601, effective March 23, 2023)

Section 304.215 City of Tuscola Wastewater Treatment Facility Discharges The requirements of Section 304.123(c) do not apply to the discharges from the City of Tuscola's wastewater treatment facility into Scattering Fork Creek, Douglas County, Illinois. (Source: Amended at 47 Ill…

Section 304.216 Newton Station Suspended Solids Discharges The limitation on the discharge of total suspended solids (TSS) in Section 304.124(a) does not apply to the discharge from the ash pond system of Illinois Power Generation Company's Newton Station, located in Jasper Count…

Section 304.218 City of Pana Phosphorus Discharge The general effluent standard for phosphorus as P in Section 304.123 does not apply to discharges from the City of Pana wastewater treatment plant. Instead these discharges must comply with an effluent limitation of 2.8 mg/L phosp…

Section 304.219 North Shore Water Reclamation District Phosphorus Discharges a) This Section applies to discharges from the North Shore Water Reclamation District excess flow discharge facilities at Waukegan and North Chicago into Lake Michigan; b) The requirements of Section 304…

Section 304.220 East St. Louis Treatment Facility, Illinois-American Water Company (Repealed) (Source: Repealed at 47 Ill. Reg. 4601, effective March 23, 2023)

Section 304.221 Ringwood Drive Manufacturing Facility in McHenry County The general effluent standards for deoxygenating wastes in Section 304.120 do not apply to discharges from the manufacturing facility located on Ringwood Drive in Ringwood, McHenry County, that discharges to …

Section 304.222 Intermittent Discharge of TRC The acute TRC water quality standard of 35 Ill. Adm. Code 302.208 and 302.504(a) by operation of Section 304.105 does not apply to any discharge that contains TRC solely as the result of intermittent use for antifouling purposes relat…

Section 304.224 Effluent Disinfection From March 1 through November 30, effluents discharged to the Primary Contact Recreation waters listed in 35 Ill. Adm. Code 303.220 must not exceed 400 fecal coliform colony forming units (CFU) per 100 ml if fewer than 10 samples are taken in…

Section 304.301 Exception for Ammonia Nitrogen Water Quality Violations (Repealed) (Source: Repealed at 21 Ill. Reg. 364, effective December 23, 1996)

Section 304.302 City of Joliet East Side Wastewater Treatment Plant (Repealed) (Source: Repealed at 47 Ill. Reg. 4601, effective March 23, 2023)

Section 304.303 Amerock Corporation, Rockford Facility (Repealed) (Source: Repealed at 47 Ill. Reg. 4601, effective March 23, 2023)

Section 304.APPENDIX A Reference to Previous Rules (Repealed) (Source: Repealed at 47 Ill. Reg. 4601, effective March 23, 2023)

Section 305.101 Preamble This Part establishes requirements to monitor, report, and measure contaminant discharges. (Source: Amended at 47 Ill. Reg. 4636, effective March 23, 2023)