Warning No Lifeguard on Duty (Wading Pool). Lettering height on sign meets specific state code. Lettering height: 4 inch and 1.5 inch. (This sign is specific to Iowa.) Please refer to the Signs by State Category to order your specific state required No Lifeguard sign! All of our swimming pool and facility signs are of the highest quality and predrilled for easy hanging. Each sign is printed using our high-quality weather and sun resistant inks.