Most state laws require the text "Warning--No Lifeguard on Duty" in legible lettering, at least four inches high. This specification is required by major states Alabama, Alaska, Arkansas, California, Colorado, Connecticut, Delaware, Florida, Kansas, Louisiana, Maine, Michigan, Mississippi, New Hampshire, North Dakota, Ohio, Pennsylvania, Tennessee, Virginia, Wisconsin, Texas, and more. Some states like South Carolina can go beyond this measurement (six-inch), while others set the limit a little lower. Each state, county, or city law may have its own requirement for the letter height of the “No Lifeguard” signs, and it is best to check the law before ordering a sign for your pool online.