Water safety Signs - This section contains all our water safety signage, prohibition, warning, mandatory and Information Signs. Implementing the correct ISO 7010 Safety Signs around water is crucial to staying safe near water, always follow instructions and read water safety signs. Prohibition safety signs show a banned action such as no swimming sign, no diving sign or no fishing sign. Warning safety signs alert people to such hazards deep cold water and strong currents. Mandatory signs are to tell people to wear life jackets etc.