Ill. Admin. Code tit. 35, § 501.357
Water directly or indirectly used in the operation of the Animal Feeding Operation for any of the following activities: spillage or overflow from animal or poultry watering systems; washing, cleaning, or flushing pens, barns, manure pits, or other Animal Feeding Operation facilities; direct contact swimming, washing, or spray cooling of animals; or dust control. It also includes any water that comes into contact with any raw materials, products, or byproducts, including manure, litter, feed, milk, eggs or bedding.
(Source: Added at 38 Ill. Reg. 17661, effective August 11, 2014)