Illinois Administrative Code

Section 301.420 Underground Waters "Underground Waters" means any waters of the State located beneath the surface of the earth.

Section 301.421 Wasteload Allocation "Waste Load Allocation" or "WLA" is the portion of receiving water's loading capacity that is allocated to one of its existing or future point sources of pollution, as more fully defined at 40 CFR 130.2(h). In the absence of a TMDL approved by…

Section 301.425 Wastewater "Wastewater" means sewage, industrial waste, or other waste, or any combination of these, whether treated or untreated, plus any admixed land runoff.

Section 301.430 Wastewater Source "Wastewater Source" means any equipment, facility, or other source of any type that discharges wastewater, directly or indirectly to the waters of the State. (Source: Amended at 47 Ill. Reg. 4415, effective March 23, 2023)

Section 301.435 Watercraft "Watercraft" means every type of boat, ship or barge used or capable of being used as a means of transportation on water.

Section 301.440 Waters "Waters" means all accumulations of water, surface and underground, natural, and artificial, public and private, or parts thereof, which are wholly or partially within, flow through, or border upon the State of Illinois, except that sewers and treatment wor…

Section 301.441 Water Quality Based Effluent Limitation "Water Quality Based Effluent Limitation" or "WQBEL" is a limit imposed in a permit so that the applicable water quality standard, criteria or value is not exceeded outside of a designated mixing zone. (Source: Amended at 47…

Section 301.442 Wet Weather Point Source "Wet Weather Point Source" means any discernible, confined, and discrete conveyance from which pollutants are, or may be, discharged as the result of a wet weather event. Discharges from wet weather point sources must include only: dischar…

Section 301.443 Whole Effluent Toxicity "Whole Effluent Toxicity" or "WET" means a test procedure that determines the effect of an effluent on aquatic life. (Source: Amended at 47 Ill. Reg. 4415, effective March 23, 2023)

Section 301.APPENDIX A References to Previous Rules (Repealed) (Source: Repealed at 47 Ill. Reg. 4415, 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)

Section 305.102 Reporting Requirements a) Every person within this State operating a pretreatment works, treatment works, or wastewater source must submit operating reports to the Illinois Environmental Protection Agency at a frequency to be determined by the Agency. The reports …

Section 305.103 Effluent Measurement To enable the Agency to inspect and investigate under Section 4(d) of the Act, all effluent discharge sewers, pipes or outfalls must be designed or modified so that a sample of the effluent can be obtained at a point after the final treatment …

Section 305.APPENDIX A References to Previous Rules (Repealed) (Source: Repealed at 47 Ill. Reg. 4636, effective March 23, 2023)

Section 308.101 Preamble This Part addresses water pollution controls for the disposal of wastes from watercraft. (Source: Amended at 47 Ill. Reg. 5012, effective March 23, 2023)

Section 308.102 Marine Toilets a) A person owning or operating a watercraft with a marine toilet must not use, or permit the use of, the toilet on the waters of this State, unless the toilet is equipped with facilities that will treat, hold, incinerate, or otherwise handle the wa…

Section 308.103 Contaminated Bilge or Ballast Waters Bilge or ballast water that fails to meet the effluent standards of 35 Ill. Adm. Code 304 must not be discharged into the waters of the State. (Source: Amended at 47 Ill. Reg. 5012, effective March 23, 2023)

Section 308.104 Statewide Application This Part applies to all waters of the State unless preempted under Section 312 of the CWA. (Source: Amended at 47 Ill. Reg. 5012, effective March 23, 2023)

Section 308.APPENDIX References to Previous Rules (Repealed) (Source: Repealed at 47 Ill. Reg. 5012, effective March 23, 2023)

Section 312.100 References to Other Sections (Repealed) (Source: Repealed at 47 Ill. Reg. 5200, effective March 23, 2023)

Section 312.101 Prohibition A person must not cause or allow the use or operation of any treatment works for which a permit is required by 35 Ill. Adm. Code 309 unless the operation of the treatment works is under the direct and active field supervision of a person who has been c…

Section 312.102 Classifications Agency rules in 35 Ill. Adm. Code 380 (Procedure for the Certification of Operators of Wastewater Treatment Works) classify treatment works by type and size based on the volume and nature of wastewater influent to the treatment works and the comple…

Section 312.103 Standards for Certification The Agency must not certify a person as a competent operator unless the person submits adequate proof that the person is competent to operate the particular class of treatment works for which certification is sought in a manner that wil…

Section 312.104 Procedures In addition to the procedures required by this Part 312, the Agency may adopt all procedures reasonably necessary to perform its duties and responsibilities under this Part. (Source: Amended at 47 Ill. Reg. 5200, effective March 23, 2023)

Section 312.105 Appeals An applicant for certification may appeal the Agency's decision to the Board in the manner provided for reviewing permit decisions under Section 40 of the Act and 35 Ill. Adm. Code 105 (Appeals of Final Decisions of State Agencies). (Source: Amended at 47 …

Section 312.APPENDIX References to Previous Rules (Repealed) (Source: Repealed at 47 Ill. Reg. 5200, effective March 23, 2023)

Section 372.100 Purpose The purpose of this Part is to establish design standards and permit application requirements for wastewater treatment systems involving the non-discharging low-rate application of wastewater to land.

Section 372.110 Scope and Applicability a) These design standards apply to non-discharging low-rate land application of secondary and tertiary treated domestic wastewater to land upon which crops, turf or trees are grown. These design standards are to be used in the preparation o…

Section 372.200 General The preliminary engineering report required under subsection 372.110(b) shall address all of the elements contained in this Subpart B, as well as any of the planning elements of Subparts C through E that are applicable to the feasibility of the project for…

Section 372.210 Site Location a) General The following factors shall be considered in the selection of the site: 1) Present and proposed land use regarding residences, buildings, developments, public access areas, for the site and adjoining properties; 2) Present and proposed wat…

Section 372.220 Hydrogeology and Soils a) General The engineering documents shall contain information on location, geology, groundwater, soil characteristics, ground slopes, area for expansion, and any other factors that will affect the feasibility and acceptability of the propos…

Section 372.230 Buffer Zone a) Non-Spray Surface Application For non-spray surface application of treated wastewater using gated pipes, subsurface irrigation, or equivalent methods, the area wetted by the treated wastewater shall not encroach on any wetlands, streams, waterways, …

Section 372.240 Loading Factors on Application Fields a) General The size of the application area shall be based on the limiting characteristic of the treated wastewater and the site. Balances shall be calculated and submitted for water, nitrogen, phosphorus, and 5 Day Biochemica…

Section 372.250 Project Layout A single topographic map of the proposed project and the area within 2,500 ft. of the project shall be submitted as a part of the engineering design. Segmented maps may be provided for large projects. The topographic map shall show the following inf…

Section 372.300 Equipment Design a) General Requirements 1) The design of all application systems shall provide facilities to assure uniform distribution of the treated wastewater over the disposal area. 2) Sufficient spare equipment and parts shall be available to assure continu…

Section 372.310 Runoff Control The design shall provide for control of the application intensity to prevent runoff in response to treated wastewater application on all parts of the application field. In order to minimize runoff during precipitation events, the exclusion of runon …

Section 372.320 Application Area Access Control The entire application area and buffer area shall be posted at 100 yard intervals around the perimeter identifying the area as a "Treated Wastewater Application Area". The application area shall be fenced to prevent access by childr…

Section 372.400 Degree of Treatment Required Relative to Application Area a) Agricultural Areas Agricultural or forested areas that do not have public access shall provide at a minimum a two cell lagoon system or a mechanical secondary treatment facility. b) Urban Areas Urban par…

Section 372.410 Preapplication Treatment Plant Design a) Design and Construction Requirements All preapplication treatment systems shall be designed and constructed in accordance with 35 Ill. Adm. Code 370, Illinois Recommended Standards for Sewage Works. b) Screening All treatme…

Section 372.420 Storage a) Storage Volume All land application systems must provide adequate storage, with adequacy being determined using either of the following methods, except that those facilities that do not generate wastewater year round must use Method I: 1) Method I Adequ…

Section 372.430 Treatment and Storage Area Access Control The entire treatment and storage lagoon area shall be enclosed with fencing to preclude livestock and prevent access by the general public. Warning signs shall be posted at 100-yard intervals on exterior fences designating…

Section 372.500 Groundwater Monitoring a) General 1) Saturated zone groundwater monitoring shall be provided for all land application systems. A minimum of three groundwater monitoring wells must be provided, one upgradient for determining background concentrations and two downgr…

Section 372.510 System Flow and Stored Volume Measurement a) System Flows Plant influent and effluent irrigation flow measurement shall be provided. Flow measurement shall not be less than elapsed time meters used in conjunction with pumping rate tests or calibrated weirs. All fl…

Section 401.101 Authority (Repealed) (Source: Repealed at 43 Ill. Reg. 11574, effective September 25, 2019)

Section 401.102 Policy A policy of the General Assembly in adopting the Environmental Protection Act [415 ILCS 5] is to restore, maintain and enhance the purity of the water of Illinois to protect health, welfare, property and the quality of life. It is determined that mining act…

Section 401.103 Purpose The purpose of Subtitle D is to prevent pollution of waters of Illinois caused by failure to plan proper environmental safeguards for the location, preparation, operation and abandonment of mining activities, mining and mine refuse operations. Subtitle D e…

Section 401.104 Compliance with Other Laws Required Nothing in this Part is intended to be inconsistent with or impair the obligation to comply with the provisions of the Surface Coal Mining Land Conservation and Reclamation Act [225 ILCS 720] or with any other State or federal l…

Section 401.105 Severability If any provision of Subtitle D is adjudged invalid or if the application to any person or in any circumstances is adjudged invalid, the invalidity will not affect the validity of this Subtitle D as a whole or of any Part, Subpart, sentence or clause n…

Section 401.106 Repealer (Repealed) (Source: Repealed at 43 Ill. Reg. 11574, effective September 25, 2019)

Section 401.APPENDIX A References to Previous Rules The following table is provided to correlate previous Board rule numbers with current Illinois Administrative Code Section numbers. Chapter 4, Mine Related Pollution Part I, General Provisions 35 Ill. Adm. Code 401 Rule 102 Sect…