S.D. Codified Laws § 1-55-14
At such time as the center determines is appropriate, the center may forward the debt to a collection agency or agencies for collection for a period of no less than one year or as otherwise stipulated in the contract between the center and the collection agency. The debt collection agency must be permitted to add a collection charge, not to exceed twenty percent of the debt, to the debt forwarded to the collection agency as payment for its collection services. The center or a collection agency may retain debt beyond the applicable collection period if the entity is actively engaged in substantive collection efforts or based on other good cause.
The Bureau of Human Resources and Administration shall promulgate rules pursuant to chapter 1-26 concerning the process of contracting with and referring debt to debt collection agencies.
SDCL 1-55-14