A water-resistant cover for an electrical outlet box generally includes a base and a lid hingedly coupled to the base. The base has a ridge surrounding a substantial periphery of the base, wherein the ridge includes a top wall, an outer side wall extending downwardly from the top wall and an inner side wall extending downwardly from the top wall. The inner side wall defines a recessed portion of the base and an opening in the recessed portion. The lid is received in the recessed portion in a closed position to cover the opening, wherein the ridge prevents water from entering the opening whether the cover is oriented horizontally or vertically.