GeoSam is Iowa’s geologic site and sample tracking program. The information available in Geosam can be used by drillers, consultants, engineers, property owners, and the general public to aid in estimating the depth to major geologic features, well depth and construction concepts, water yield of specific aquifers and other site specific information needs. GeoSam provides location, identification, and other key information about every available well, rock exposure, or site of geologic information in Iowa.