South Dakota’s septic systems face extreme climate swings, including subzero winters, rapid snowmelt, claypan soils, and intense storm seasons. Frozen soil restricts absorption, and fast spring warming can overwhelm drainfields with meltwater and runoff. This guide teaches homeowners how to winterize lines, insulate components, and reduce water usage during peak freeze–thaw periods. The Septic Saver course includes South Dakota-specific strategies for handling prairie winds that dry and crack soils, Badlands sediment impacts, and moisture fluctuations throughout the state. Homeowners will learn how slope direction, soil composition, and vegetation affect long-term septic system stability. The training also covers early-warning signs of freeze damage, groundwater infiltration, and saturation stress. With proper maintenance, South Dakota residents can extend system life and prevent costly failures. This guide provides clear, actionable steps for maintaining septic performance in the state’s extreme climate conditions.