Hazards facing St. Louis County may consist of natural hazards or technological hazards.
Natural hazards are hazards presented by the physical world such as ice storms, thunderstorms, lightning, tornadoes, hailstorms, windstorms, extreme temperatures, flooding, drought, wildfire, infectious diseases, earthquake, and solar storms.
Technological hazards are hazards presented by man such as structural fires, hazardous materials, water supply contamination, wastewater system failure, dam failure, radiological and terrorism.