The hazards or threats currently faced in Markham are similar to those faced in most Greater Toronto Area municipalities. The top hazards include, but are not limited to:

  • Cyber-attack causing major technical failure of communications systems causing widespread multi-day communications breakdown
  • Special Event, e.g. Pan Am Games, causing transportation and service disruption
  • Hazardous Materials Incident - Transport accidents involving trucks or railcars
  • Severe winter storms (blizzards, ice storms) causing travel and business disruption
  • Natural Gas pipeline emergency causing evacuations
  • Severe summer storms (high wind/rain, tornadoes, hurricanes) with sustained rainfall and potential flash floods causing widespread property damage
  • Epidemic of infectious disease outbreaks in humans or animals causing mass apprehension and reaction
  • Terrorism/ Chemical, Biological, Radiological, Nuclear and Explosives (CBRNE ) causing widespread disruption, casualties, fear and affecting social and economic welfare