S.D. Codified Laws § 34A-2-109
In conjunction with state universities and other interested parties, the secretary shall annually review new studies and data that relate to the relationships between fertilizer and pesticide use practices and the quality of waters of the state. From this review, the state shall formulate and revise as necessary state management plans for the use of fertilizers and pesticides that are based on protecting water quality and preventing groundwater pollution. These management plans will be based on use practices within the state as a whole or in specific areas within the state depending on hydrogeological differences, and shall be used by the state in regulating fertilizers and pesticides pursuant to chapters 38-19, 38-20A, and 38-21 in developing future contingency plans, and in performing public education.
SDCL 34A-2-109