Haute-Garonne

Recorded Natural Hazards (Géorisques)

It has 586 municipalities and 1,471,468 inhabitants. Under the seismic zoning in force since 2011, 60 municipalities are in a medium or high seismicity zone (1% of inhabitants). A natural disaster has been declared 6,426 times since 1982 (one declaration per municipality and decree), mostly for floods (2,930) and drought (2,265). The most recent was signed on 8 July 2025. 34 municipalities have a high radon potential (category 3), home to 1% of inhabitants. 451 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

• 2009Floods and Mudflows · 24 January 2009586 municipalities
• 1999Ground Movements · 25 December 1999585 municipalities
• 1999Floods and Mudflows · 25 December 1999585 municipalities
• 1982Storms · 6 November 1982585 municipalities
• 1982Floods and Mudflows · 6 November 1982585 municipalities
• 2003Drought (Clay Shrinkage) · 1 July 2003123 municipalities

Most Frequently Affected Municipalities

• 43Toulouse
• 31Plaisance-du-Touch
• 28Muret
• 27Saint-Orens-de-Gameville
• 25Gratentour
• 25Pibrac
• 25L'Union
• 24Balma

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