Ill. Admin. Code tit. 35 § 502.103
An Animal Feeding Operation is defined as a Large CAFO if at least the numbers of animals specified in any of the following categories are stabled or confined:
Number of Animals | Kind of Animals |
700 | Mature dairy cows, whether milked or dry |
1,000 | Veal calves |
1,000 | Cattle other than mature dairy cows or veal calves. Cattle includes heifers, steers, bulls, and cow/calf pairs. |
2,500 | Swine, each weighing 55 pounds or more |
10,000 | Swine, each weighing less than 55 pounds |
500 | Horses |
10,000 | Sheep or lambs |
55,000 | Turkeys |
30,000 | Laying hens or broilers, if the Animal Feeding Operation uses a liquid manure handling system |
125,000 | Chickens (other than laying hens), if the Animal Feeding Operation uses other than a liquid manure handling system |
82,000 | Laying hens, if the Animal Feeding Operation uses other than a liquid manure handling system |
30,000 | Ducks, if the Animal Feeding Operation uses other than a liquid manure handling system |
5,000 | Ducks, if the Animal Feeding Operation uses a liquid manure handling system |
Ill. Admin. Code tit. 35, § 502.103