Ardèche

Recorded Natural Hazards (Géorisques)

It has 335 municipalities and 334,231 inhabitants. Under the seismic zoning in force since 2011, its highest seismicity is moderate (zone 3 of 5). A natural disaster has been declared 2,929 times since 1982 (one declaration per municipality and decree), mostly for floods (2,184) and drought (350). The most recent was signed on 18 January 2026. 235 municipalities have a high radon potential (category 3), home to 60% of inhabitants. 139 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 1982335 municipalities
• 1982Storms · 6 November 1982335 municipalities
• 1992Floods and Mudflows · 22 September 1992126 municipalities
• 1995Floods and Mudflows · 4 October 199595 municipalities
• 2024Floods and Mudflows · 15 October 202495 municipalities
• 1993Floods and Mudflows · 1 October 199389 municipalities

Most Frequently Affected Municipalities

• 23Viviers
• 22Baix
• 21Rochemaure
• 21Le Teil
• 20Bourg-Saint-Andéol
• 18Saint-Marcel-d'Ardèche
• 18Saint-Péray
• 17Saint-Georges-les-Bains

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