Illinois Administrative Code

Section 302.408 Temperature a) For the South Fork of the South Branch of the Chicago River (Bubbly Creek), the temperature must not exceed 34 ºC (93 ºF) more than 5% of the time, or 37.8 ºC (100 ºF) at any time. b) The temperature standards in subsections (c) through (i) will bec…

Section 302.409 Cyanide for the South Fork of the South Branch of the Chicago River (Bubbly Creek) Cyanide (total) must not exceed 0.10 mg/L in the South Fork of the South Branch of the Chicago River (Bubbly Creek). (Source: Amended at 47 Ill. Reg. 4437, effective March 23, 2023)

Section 302.410 Other Toxic Substances Any substance or combination of substances toxic to aquatic life not listed in Section 302.407 must not exceed one-half of the 96-hour median tolerance limit (96-hour TLm) for native fish or essential fish food organisms in the South Fork of…

Section 302.412 Total Ammonia Nitrogen a) This Section does not apply to the South Fork of the South Branch of the Chicago River (Bubbly Creek). b) For the Chicago Area Waterway System and the Lower Des Plaines River described in 35 Ill. Adm. Code 303.204 and listed in 35 Ill. Ad…

Section 302.501 Scope, Applicability, and Definitions a) Subpart E contains the Lake Michigan Basin water quality standards. These must be met in the waters of the Lake Michigan Basin as designated in 35 Ill. Adm. Code 303.443. b) In addition to the definitions provided at 35 Ill…

Section 302.502 Dissolved Oxygen Dissolved oxygen must not be less than 90% of saturation, except due to natural causes, in the Open Waters of Lake Michigan as defined at Section 302.501. The other waters of the Lake Michigan Basin must not be less than 6.0 mg/L during at least 1…

Section 302.503 pH pH must be within the range of 7.0 to 9.0, except due to natural causes, in the Open Waters of Lake Michigan as defined at Section 302.501. Other waters of the Basin must be within the range of 6.5 to 9.0 except due to natural causes. (Source: Amended at 47 Ill…

Section 302.504 Chemical Constituents The following concentrations of chemical constituents must not be exceeded, except as provided in Sections 302.102 and 302.530: a) The following standards must be met in all waters of the Lake Michigan Basin. Acute aquatic life standards (AS)…

Section 302.505 Fecal Coliform Based on a minimum of five samples taken over not more than a 30-day period, fecal coliform must not exceed a geometric mean of 20 per 100 ml in the Open Waters of Lake Michigan as defined in Section 302.501. The remaining waters of the Lake Michiga…

Section 302.506 Temperature a) The owner or operator of a source of heated effluent must maintain records and conduct studies of the effluents from the source and their effects as may be required by the Agency or in any permit granted under the Act. b) Backfitting of alternative …

Section 302.507 Thermal Standards for Existing Sources on January 1, 1971 All sources of heated effluents in existence as of January 1, 1971, must meet the following restrictions outside of a mixing zone that is no greater than a circle with a radius of 305 m (1000 feet) or an eq…

Section 302.508 Thermal Standards for Sources Under Construction But Not In Operation on January 1, 1971 Any effluent source under construction but not in operation on January 1, 1971, must meet all the requirements of Section 302.507 and must meet the following restrictions: a) …

Section 302.509 Other Sources a) A source of heated effluent that was not in operation or under construction as of January 1, 1971, must not discharge more than a daily average of 29 megawatts (0.1 billion British thermal units per hour). b) Sources of heated effluents that disch…

Section 302.510 Incorporations by Reference (Repealed) (Source: Repealed at 47 Ill. Reg. 4437, effective March 23, 2023)

Section 302.515 Offensive Conditions Waters of the Lake Michigan Basin must be free from sludge or bottom deposits, floating debris, visible oil, odor, plant or algal growth, and color or turbidity of other than natural origin. The allowed mixing provisions of Section 302.102 mus…

Section 302.520 Regulation and Designation of Bioaccumulative Chemicals of Concern (BCCs) a) For regulating BCCs in compliance with Sections 302.521 and 302.530, the following chemicals must be considered as BCCs: 1) any chemical or class of chemicals listed as a BCC in Section 3…

Section 302.521 Supplemental Antidegradation Provisions for BCCs a) Notwithstanding the provisions of Section 302.105, waters within the Lake Michigan Basin must not be lowered in quality due to new or increased loading of substances defined as BCCs in Section 302.501 from any so…

Section 302.525 Radioactivity Except as provided in Section 302.102, all waters of the Lake Michigan Basin must meet the following concentrations: a) Gross beta concentrations must not exceed 100 picocuries per liter (pCi/L). b) Strontium 90 concentration must not exceed 2 picocu…

Section 302.530 Supplemental Mixing Provisions for Bioaccumulative Chemicals of Concern (BCCs) The Allowed Mixing, Mixing Zones, and ZIDs provisions of Section 302.102 apply within the Lake Michigan Basin except as otherwise provided for substances defined as BCCs in Section 302.…

Section 302.535 Ammonia Nitrogen The Open Waters of Lake Michigan as defined in Section 302.501 must not exceed 0.02 mg/L total ammonia (as N). The remaining waters of the Lake Michigan Basin are subject to the following: a) Total ammonia nitrogen (as N) must in no case exceed 15…

Section 302.540 Other Toxic Substances Waters of the Lake Michigan Basin must be free from any substance or any combination of substances in concentrations toxic or harmful to human health or animal, plant, or aquatic life. The numeric standards protective of particular uses spec…

Section 302.545 Data Requirements The Agency must review for validity, applicability, and completeness the data used in calculating criteria or values. To the extent available and not otherwise specified, testing procedures, selection of test species, and other aspects of data ac…

Section 302.550 Analytical Testing All methods of sample collection, preservation, and analysis used in applying any of the requirements of this Subpart must be consistent with the methods published by USEPA or nationally recognized standards of organizations, including those met…

Section 302.553 Determining the Lake Michigan Aquatic Toxicity Criteria or Values − General Procedures The Lake Michigan Aquatic Life Criteria and Values are those concentrations or levels of a substance at which aquatic life is protected from adverse effects resulting from short…

Section 302.555 Determining the Tier I Lake Michigan Acute Aquatic Toxicity Criterion (LMAATC): Independent of Water Chemistry If the acute toxicity of the chemical has not been shown to be related to a water quality characteristic, including hardness, pH, or temperature, the Tie…

Section 302.560 Determining the Tier I Lake Michigan Basin Acute Aquatic Life Toxicity Criterion (LMAATC): Dependent on Water Chemistry If data are available to show that a relationship exists between a water quality characteristic (WQC) and acute toxicity to two or more species,…

Section 302.563 Determining the Tier II Lake Michigan Basin Acute Aquatic Life Toxicity Value (LMAATV) If all eight minimum data requirements for calculating a FAV using Tier I procedures are not met, a Tier II LMAATV must be calculated for a substance as follows: a) The lowest G…

Section 302.565 Determining the Lake Michigan Basin Chronic Aquatic Life Toxicity Criterion (LMCATC) or the Lake Michigan Basin Chronic Aquatic Life Toxicity Value (LMCATV) a) Determining Tier I LMCATC 1) When chronic toxicity data are available for at least eight resident or ind…

Section 302.570 Procedures for Deriving Bioaccumulation Factors for the Lake Michigan Basin A bioaccumulation factor (BAF) is used to relate the concentration of a substance in an aquatic organism to the concentration of the substance in the waters in which the organism resides w…

Section 302.575 Procedures for Deriving Tier I Water Quality Criteria and Values in the Lake Michigan Basin to Protect Wildlife The Lake Michigan Basin Wildlife Criterion (LMWC) is the concentration of a substance that, if not exceeded, protects Illinois wild mammal and bird popu…

Section 302.580 Procedures for Deriving Water Quality Criteria and Values in the Lake Michigan Basin to Protect Human Health - General a) The Lake Michigan Basin human health criteria or values for a substance are those concentrations at which humans are protected from adverse ef…

Section 302.585 Procedures for Determining the Lake Michigan Basin Human Health Threshold Criterion (LMHHTC) and the Lake Michigan Basin Human Health Threshold Value (LMHHTV) The LMHHTC or LMHHTV is derived for all toxic substances from the most sensitive endpoint for which there…

Section 302.590 Procedures for Determining the Lake Michigan Basin Human Health Nonthreshold Criterion (LMHHNC) or the Lake Michigan Basin Human Health Nonthreshold Value (LMHHNV) An LMHHNC or LMHHNV must be derived for those toxic substances for which any exposure, regardless of…

Section 302.595 Listing of Bioaccumulative Chemicals of Concern, Derived Criteria and Values a) The Agency must maintain a listing of toxicity criteria and values derived under this Subpart. This list must be made available to the public and updated whenever a new criterion or va…

Section 302.601 Scope and Applicability This Subpart contains the procedures for determining the water quality criteria in Sections 302.210(a), (b), and (c) and 302.410(a), (b), and (c). (Source: Amended at 47 Ill. Reg. 4437, effective March 23, 2023)

Section 302.603 Definitions As used in this Subpart, the following terms have the meanings specified. "Bioconcentration" means an increase in the concentration of a chemical and its metabolites in an organism (or its specified tissues) relative to the concentration of the chemica…

Section 302.604 Mathematical Abbreviations This Subpart uses the following mathematical abbreviations: exp x base of the natural logarithm, e, raised to x-power ln x natural logarithm of x log x logarithm to the base 10 of x A**B A raised to the B-power SUM(x) summation of the va…

Section 302.606 Data Requirements The Agency must review, for validity, applicability, and completeness, data used in calculating criteria. To the extent available and not otherwise specified, testing procedures, selection of test species and other aspects of data acquisition mus…

Section 302.612 Determining the Acute Aquatic Toxicity Criterion for an Individual Substance - General Procedures a) A chemical-specific Acute Aquatic Toxicity Criterion (AATC) is calculated using procedures specified in Sections 302.615 and 302.618 if acute toxicity data are ava…

Section 302.615 Determining the Acute Aquatic Toxicity Criterion – Toxicity Independent of Water Chemistry If the acute toxicity of the chemical has not been shown to be related to a water quality characteristic, including hardness, pH, or temperature, the AATC is calculated by u…

Section 302.618 Determining the Acute Aquatic Toxicity Criterion - Toxicity Dependent on Water Chemistry If data are available to show that a relationship exists between a water quality characteristic (WQC) and acute toxicity to two or more species, an Acute Aquatic Toxicity Crit…

Section 302.621 Determining the Acute Aquatic Toxicity Criterion - Procedure for Combinations of Substances An AATC for any combination of substances (including effluent mixtures) must be determined by the following toxicity testing procedures: a) Not more than 50% of test organi…

Section 302.627 Determining the Chronic Aquatic Toxicity Criterion for an Individual Substance - General Procedures a) A chemical-specific Chronic Aquatic Toxicity Criterion (CATC) is calculated using procedures specified in subsection (b) when chronic toxicity data are available…

Section 302.630 Determining the Chronic Aquatic Toxicity Criterion - Procedure for Combinations of Substances A CATC for any combination of substances (including effluent mixtures) may be determined by toxicity testing procedures pursuant to the following: a) A combination of sub…

Section 302.633 The Wild and Domestic Animal Protection Criterion The Wild and Domestic Animal Protection Criterion (WDAPC) is the concentration of a substance that, if not exceeded, protects Illinois wild and domestic animals from adverse effects, such as functional impairment o…

Section 302.642 The Human Threshold Criterion The Human Threshold Criterion (HTC) of a substance is that concentration or level of a substance at which humans are protected from adverse effects resulting from incidental exposure to, or ingestion of, surface waters of the State an…

Section 302.645 Determining the Acceptable Daily Intake The Acceptable Daily Intake (ADI) is the maximum amount of a substance that, if ingested daily for a lifetime, results in no adverse effects to humans. Subsections (a) through (e) list, in the order of preference, methods fo…