Ain

Recorded Natural Hazards (Géorisques)

It has 391 municipalities and 679,344 inhabitants. Under the seismic zoning in force since 2011, 4 municipalities are in a medium or high seismicity zone (0% of inhabitants). A natural disaster has been declared 1,192 times since 1982 (one declaration per municipality and decree), mostly for floods (744) and drought (379). The most recent was signed on 19 January 2025. 144 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

• 1990Floods and Mudflows · 13 February 1990143 municipalities
• 2018Drought (Clay Shrinkage) · 1 July 201897 municipalities
• 1982Floods and Mudflows · 8 December 198264 municipalities
• 1991Floods and Mudflows · 21 December 199155 municipalities
• 2020Drought (Clay Shrinkage) · 1 April 202044 municipalities
• 2003Drought (Clay Shrinkage) · 1 July 200340 municipalities

Most Frequently Affected Municipalities

• 14Fareins
• 13Bourg-en-Bresse
• 12Ambronay
• 12Saint-Bernard
• 11Pont-de-Vaux
• 11Val-Revermont
• 11Massieux
• 11Messimy-sur-Saône

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