Loiret

Recorded Natural Hazards (Géorisques)

It has 325 municipalities and 691,268 inhabitants. Under the seismic zoning in force since 2011, its highest seismicity is very low (zone 1 of 5). A natural disaster has been declared 2,065 times since 1982 (one declaration per municipality and decree), mostly for drought (874) and floods (804). The most recent was signed on 22 June 2025. 93 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

• 1999Floods and Mudflows · 25 December 1999325 municipalities
• 1999Ground Movements · 25 December 1999325 municipalities
• 2016Floods and Mudflows · 28 May 2016232 municipalities
• 2018Drought (Clay Shrinkage) · 1 October 201877 municipalities
• 2018Drought (Clay Shrinkage) · 1 July 201874 municipalities
• 1989Drought (Clay Shrinkage) · 1 May 198966 municipalities

Most Frequently Affected Municipalities

• 21Amilly
• 21Olivet
• 19Orléans
• 17La Chapelle-Saint-Mesmin
• 15Saint-Jean-de-Braye
• 14La Ferté-Saint-Aubin
• 13Chaingy
• 13Château-Renard

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