Loire

Recorded Natural Hazards (Géorisques)

It has 320 municipalities and 774,133 inhabitants. Under the seismic zoning in force since 2011, its highest seismicity is moderate (zone 3 of 5). A natural disaster has been declared 2,518 times since 1982 (one declaration per municipality and decree), mostly for floods (1,311) and storms (332). The most recent was signed on 22 June 2025. 253 municipalities have a high radon potential (category 3), home to 78% of inhabitants. 98 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

• 1982Snow Load · 26 November 1982323 municipalities
• 1982Floods and Mudflows · 6 November 1982323 municipalities
• 1982Storms · 6 November 1982323 municipalities
• 1983Floods and Mudflows · 1 May 1983296 municipalities
• 1983Ground Movements · 1 May 1983296 municipalities
• 2008Floods and Mudflows · 1 November 2008103 municipalities

Most Frequently Affected Municipalities

• 20Saint-Étienne
• 18Mably
• 17Perreux
• 17Riorges
• 17Villerest
• 16Saint-Vincent-de-Boisset
• 16Sorbiers
• 16La Talaudière

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