Tarn

Recorded Natural Hazards (Géorisques)

It has 314 municipalities and 397,352 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 2,765 times since 1982 (one declaration per municipality and decree), mostly for floods (1,182) and drought (1,154). The most recent was signed on 22 June 2025. 104 municipalities have a high radon potential (category 3), home to 35% of inhabitants. 314 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

• 1982Floods and Mudflows · 6 November 1982314 municipalities
• 1982Storms · 6 November 1982314 municipalities
• 2022Drought (Clay Shrinkage) · 1 July 2022182 municipalities
• 2003Drought (Clay Shrinkage) · 1 July 2003121 municipalities
• 2017Drought (Clay Shrinkage) · 1 January 201796 municipalities
• 2016Drought (Clay Shrinkage) · 1 January 201659 municipalities

Most Frequently Affected Municipalities

• 33Castres
• 27Albi
• 26Gaillac
• 24Labruguière
• 23Saïx
• 22Rabastens
• 21Graulhet
• 21Lisle-sur-Tarn

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