Haut-Rhin

Recorded Natural Hazards (Géorisques)

It has 366 municipalities and 770,738 inhabitants. Under the seismic zoning in force since 2011, 136 municipalities are in a medium or high seismicity zone (20% of inhabitants). A natural disaster has been declared 1,753 times since 1982 (one declaration per municipality and decree), mostly for floods (1,241) and ground movements (487). The most recent was signed on 22 June 2025. 96 municipalities have a high radon potential (category 3), home to 20% of inhabitants. 142 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

• 1999Ground Movements · 25 December 1999366 municipalities
• 1999Floods and Mudflows · 25 December 1999366 municipalities
• 1983Ground Movements · 25 May 1983117 municipalities
• 1983Floods and Mudflows · 25 May 1983117 municipalities
• 1990Floods and Mudflows · 14 February 1990107 municipalities
• 1983Floods and Mudflows · 1 April 198363 municipalities

Most Frequently Affected Municipalities

• 15Illfurth
• 12Aspach
• 12Heidwiller
• 12Orbey
• 12Walheim
• 11Altkirch
• 11Balschwiller
• 11Lapoutroie

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