Illinois Administrative Code

Section 501.205 Act The Illinois Environmental Protection Act.

Section 501.210 Administrator The Administrator of the United States Environmental Protection Agency or his designee.

Section 501.215 Air Pollution The presence in the atmosphere of one or more contaminants in sufficient quantities and of such characteristics and duration as to be injurious to human, plant or animal life, to health, or to property, or to unreasonably interfere with the enjoyment…

Section 501.220 Agency The Illinois Environmental Protection Agency.

Section 501.223 Animal Confinement Area Animal confinement area includes open lots, housed lots, feedlots, confinement houses, stall barns, free stall barns, milkrooms, milking centers, cowyards, barnyards, medication pens, walkers, animal walkways, and stables. (Source: Amended …

Section 501.225 Animal Feeding Operation a) A lot or facility (other than an aquatic animal production facility) where the following conditions are met: 1) Animals have been, are, or will be stabled or confined and fed or maintained for a total of 45 days or more in any 12-month …

Section 501.230 Animal Unit A unit of measurement for any animal feeding operation calculated by adding the following animal numbers: a) Brood cows and slaughter and feeder cattle multiplied by 1.0 b) Milking dairy cows multiplied by 1.4 c) Young dairy stock multiplied by 0.6 d) …

Section 501.235 Board The Illinois Pollution Control Board.

Section 501.236 Chemicals and Other Contaminants Antibiotics, hormones, feed additives, pesticides, hazardous and toxic chemicals, petroleum products and by-products, other chemical products and by-products, and the residues and containers of any of these materials. (Source: Adde…

Section 501.238 Concentrated Animal Feeding Operation (CAFO) An Animal Feeding Operation (AFO) that is defined as a Large CAFO under 35 Ill. Adm. Code 502.103 or as a medium CAFO under 35 Ill. Adm. Code 502.104, or that is designated as a CAFO under 35 Ill. Adm. Code 502.106. (So…

Section 501.240 Construction Start of on-site fabrication, erection, or installation. (Source: Amended at 48 Ill. Reg. 3170, effective February 15, 2024)

Section 501.241 CWA The Clean Water Act, as amended (33 USC 1251 et seq.). (Source: Amended at 38 Ill. Reg. 17661, effective August 11, 2014)

Section 501.242 Dry lot A facility for growing ducks in confinement with a dry litter floor cover and no access to swimming areas. (Source: Added at 38 Ill. Reg. 17661, effective August 11, 2014)

Section 501.244 Erosion Factor T An estimate of the maximum average annual rate, in tons per acre per year, of soil erosion by water that can occur without affecting crop productivity over a sustained period. BOARD NOTE: Erosion Factor T for Illinois soils is available from the U…

Section 501.245 Existing Livestock Management Facility and Livestock Waste-Handling Facility Any livestock management facility and livestock waste-handling facility, the construction or modification which started before the effective date of this Chapter. (Source: Amended at 48 I…

Section 501.246 Expansion Start of construction at a livestock management facility or livestock waste-handling facility where the fixed capital cost of the new components constructed within a 2-year period exceeds 50% of a comparable entirely new facility’s fixed capital cost. (S…

Section 501.248 Farm Residence Any residence on a farm owned or occupied by the farm owners, operators, tenants, or seasonal or year-round hired workers. For this definition, a "farm" is the land, buildings, and machinery used in the commercial production of farm products, and "f…

Section 501.250 Feedlot Runoff Polluted liquid flowing from any animal feeding operation caused by precipitation or other water sources falling on or flowing onto an animal feeding operation. (Source: Amended at 2 Ill. Reg. 44, p. 137, effective October 30, 1978)

Section 501.252 Frozen Ground Soil that is frozen anywhere between the first ½ inch to 8 inches of soil as measured from the ground surface. (Source: Added at 38 Ill. Reg. 17661, effective August 11, 2014)

Section 501.253 Grassed Waterway A natural or constructed waterway or outlet shaped or graded and established in suitable vegetation as needed for the conveyance of runoff from a field, diversion or other structure. (Source: Added at 38 Ill. Reg. 17661, effective August 11, 2014)

Section 501.254 Groundwater Underground water which occurs within the saturated zone and geologic materials where the fluid pressure in the pore space is equal to or greater than atmospheric pressure [415 ILCS 5/3.210]. (Source: Added at 38 Ill. Reg. 17661, effective August 11, 2…

Section 501.255 Holding Pond Any excavated, diked or walled structure or combination of structures designed for the interception and temporary storage of feedlot runoff.

Section 501.260 Impermeable Not permitting significant passage of fluids under the usual pressure differences found in constructed livestock waste-handling facilities.

Section 501.261 Incorporation A method of land application of livestock waste in which the livestock waste is thoroughly mixed or completely covered with the soil within 24 hours. Any ponded liquid livestock waste remaining on the site after application is not considered to be th…

Section 501.263 Injection The placement of livestock waste 4 to 12 inches below the soil surface in the crop root zone using equipment specifically designed for that purpose, when the applied material is retained by the soil. (Source: Added at 38 Ill. Reg. 17661, effective August…

Section 501.265 Lagoon Any excavated, diked or walled structure or combination of structures designed for biological stabilization and storage of livestock wastes.

Section 501.267 Land Application Area Land under the control of an Animal Feeding Operation owner or operator, whether it is owned, rented or leased, to which livestock waste from the production area is or may be applied. (Source: Added at 38 Ill. Reg. 17661, effective August 11,…

Section 501.270 Leachate Waters containing materials removed from livestock waste.

Section 501.274 Liquid Livestock Waste Livestock waste which can be spread with a conventional liquid manure spreader. This includes pit manures, lagoon manures, holding pond or tank manures, and any other livestock waste consisting of less than 20% solids concentration. (Source:…

Section 501.275 Liquid Manure-Holding Tank Any fabricated structure, with or without a cover, either formed in place or transported to the site, used for containing liquid livestock wastes.

Section 501.280 Livestock Farm animals kept or raised for food, profit, use or pleasure to include the species fowl, ovine, caprine, bovine, porcine, equine and other commercially produced animals and operations such as mink, rabbit, etc.

Section 501.285 Livestock Management Facility Any animal feeding operation, livestock shelter or on-farm milking and accompanying milk-handling area. (Source: Amended at 2 Ill. Reg. 44, p. 137, effective October 30, 1978)

Section 501.290 Livestock Shelter Any covered structure, including livestock houses or barns, in which livestock are enclosed at any time. (Source: Amended at 48 Ill. Reg. 3170, effective February 15, 2024)

Section 501.295 Livestock Waste Manure, litter, process wastewater, overflow from watering systems, wash waters, sprinkling waters from livestock cooling, precipitation polluted by falling on or flowing onto an Animal Feeding Operation, and other materials polluted by livestock, …

Section 501.300 Livestock Waste-Handling Facility Individually or collectively those constructions or devices, except sewers, used for collecting, pumping, treating, or disposing of livestock waste or for the recovery of by-products from livestock waste. The facility includes acc…

Section 501.305 Man-made Constructed by man. (Source: Amended at 38 Ill. Reg. 17661, effective August 11, 2014)

Section 501.310 Man-made Ditch A discrete fissure or channel excavated in the earth. (Source: Amended at 38 Ill. Reg. 17661, effective August 11, 2014)

Section 501.312 Manure Animal excreta, bedding, compost and raw materials or other materials commingled with manure or set aside for disposal. (Source: Added at 38 Ill. Reg. 17661, effective August 11, 2014)

Section 501.313 Manure Storage Area Includes lagoons, runoff ponds, storage sheds, stockpiles, under-the-house or pit storages, liquid impoundments, static piles, and composting piles. (Source: Amended at 48 Ill. Reg. 3170, effective February 15, 2024)

Section 501.315 Manure Storage Structure Any permanent area or structure which is impermeable and is used for stacking, storing or containment of livestock waste.

Section 501.317 Maximum Feasible Location Any location establishing a new livestock management facility or new livestock waste-handling facility where one of the following conditions exists: a) The site is located closer to the livestock owner's or operator's residence than to a …

Section 501.320 Modification The physical change in or alteration in the method of operation of any livestock management facility or livestock waste-handling facility that increases the livestock waste amount over the level authorized by the NPDES permit. (Source: Amended at 48 I…

Section 501.325 Navigable Waters (Repealed) (Source: Repealed at 38 Ill. Reg. 17661, effective August 11, 2014)

Section 501.330 New Livestock Management Facility and New Livestock Waste-Handling Facility Any livestock management facility or livestock waste-handling facility the construction or modification of which is started after December 31, 1977. (Source: Amended at 48 Ill. Reg. 3170, …

Section 501.333 New Source Any building, structure, facility, or installation from which there is or may be a discharge of pollutants, the construction of which started after either of the following dates: a) after the promulgation of standards of performance under Section 306 of…

Section 501.335 NPDES The National Pollutant Discharge Elimination System for issuing, establishing conditions for, and denying permits under Section 402 of the CWA. All terms used regarding NPDES that have been defined in the CWA or regulations adopted under the CWA have the mea…

Section 501.340 NPDES Permit A permit issued under the NPDES. (Source: Amended at 48 Ill. Reg. 3170, effective February 15, 2024)