S.D. Codified Laws § 34A-2-36.3

If an operation processes or stores manure, or processes or stores process wastewater, as those terms are defined in 40 C.F.R. § 122.23 (January 1, 2023), without coverage under a concentrated animal feeding operation's general or individual water pollution control permit issued pursuant to §§ 34A-2-36 and 34A-2-36.2, and if the maximum number of permitted or unpermitted animals from which manure or process wastewater is processed or stored would meet the definition of a large concentrated animal feeding operation, under 40 C.F.R. § 122.23 (January 1, 2023), that operation must obtain its own general or individual water pollution permit pursuant to § 34A-2-36.