Rhône

Recorded Natural Hazards (Géorisques)

It has 266 municipalities and 1,914,667 inhabitants. Under the seismic zoning in force since 2011, its highest seismicity is moderate (zone 3 of 5). A natural disaster has been declared 2,619 times since 1982 (one declaration per municipality and decree), mostly for floods (1,477) and drought (326). The most recent was signed on 22 June 2025. 163 municipalities have a high radon potential (category 3), home to 21% of inhabitants. 207 municipalities are covered by an approved natural hazard prevention plan.

Seismicity Zones

Number of municipalities in each zone of the regulatory seismic zoning (from 1, very low, to 5, high).

Natural Disasters Declared Since 1982

Declarations per five-year period.

Most Widespread Events

• 1982Floods and Mudflows · 6 November 1982267 municipalities
• 1982Storms · 6 November 1982267 municipalities
• 1982Snow Load · 26 November 1982265 municipalities
• 1983Ground Movements · 1 April 1983147 municipalities
• 1983Floods and Mudflows · 1 May 1983142 municipalities
• 2003Floods and Mudflows · 1 December 2003127 municipalities

Most Frequently Affected Municipalities

• 22Anse
• 22Lyon
• 2269159
• 22Saint-Didier-au-Mont-d'Or
• 21Givors
• 19Arnas
• 19Lucenay
• 19Genay

Hazards Listed by Municipality

Number of municipalities exposed to each natural hazard according to the departmental major risks file.

Hazards at a specific address on Géorisques