Côtes-d'Armor

Recorded Natural Hazards (Géorisques)

It has 344 municipalities and 611,859 inhabitants. Under the seismic zoning in force since 2011, its highest seismicity is low (zone 2 of 5). A natural disaster has been declared 2,381 times since 1982 (one declaration per municipality and decree), mostly for floods (1,180) and wave action (401). The most recent was signed on 22 June 2025. 265 municipalities have a high radon potential (category 3), home to 85% of inhabitants. 22 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

• 1999Wave Impact, Coastal Flooding · 25 December 1999347 municipalities
• 1999Floods and Mudflows · 25 December 1999347 municipalities
• 1999Ground Movements · 25 December 1999347 municipalities
• 1987Storms · 15 October 1987347 municipalities
• 1995Floods and Mudflows · 17 January 1995105 municipalities
• 1988Floods and Mudflows · 15 January 198895 municipalities

Most Frequently Affected Municipalities

• 18Dinan
• 17Plérin
• 14Pléneuf-Val-André
• 14Plouha
• 13Bon Repos sur Blavet
• 13Paimpol
• 13Plénée-Jugon
• 13Plouézec

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