SDCL § 46-6-21: Control of large capacity well required.

No owner or person in control of a large capacity artesian well may allow it to flow without a proper or sufficient casing or without a valve or contrivance for checking or preventing the flow of water if the Water Management Board determines that installation of a casing, valve, or contrivance is feasible. The provisions of this section also apply to any officer in charge of wells belonging to the state or any county, township, or municipality.