Phelps County sits on karst, so sinkholes are a real question

Phelps County lies in Ozark karst, a limestone landscape where water dissolves underground channels and creates sinkholes, springs, and caves. The same geology that feeds nearby springs is a practical homeowner issue: sinkholes can affect drainage and stormwater, and they can complicate building and septic siting. Because water moves fast through karst, what goes into the ground at a sinkhole can reach groundwater quickly, which is one reason well protection matters here. Before buying land or building, it is reasonable to ask whether a parcel has mapped sinkhole or karst features. The Missouri Geological Survey, conveniently headquartered in Rolla, maintains the geologic and karst data, including GeoSTRAT, that is the right place to begin.