A detectable warning tile is a molded sheet having generally planar top and bottom surfaces, the top surface having a plurality of spaced apart truncated domes in relief thereon, the bottom surface having a grid pattern of depressions therein. Partitions rising from the bottom surface are positioned within the interior of the domes and are integral therewith. The bottom surface may have an adhesive layer for bonding with a solid under-surface. Alternately, anchors may be engaged with the bottom surface for securing the tile in a uncured cement, concrete or blacktop surface.