S.D. Codified Laws § 25-7-7.5
In order to preserve such judgment against subsequent mortgages, purchasers, or judgment creditors for value and without actual notice of the lien on any property situated in a county, the support obligee or the secretary of the Department of Social Services may give notice of the judgment by filing in the office of the clerk of courts of the county in which the order for support is filed, or in any county in which a transcript of the order is filed and docketed, a sworn statement or certificate showing the amount of unpaid support due under the order. The clerk of courts shall file and docket the statement or certificate with the order for support or transcript thereof, as evidence of the amount of the judgment for support, as provided in chapter 15-16. The judgment shall be effective from the date and time of docketing the statement or certificate in the office of the clerk of courts.
SDCL 25-7-7.5