Marne

Recorded Natural Hazards (Géorisques)

It has 610 municipalities and 563,076 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 2,193 times since 1982 (one declaration per municipality and decree), mostly for floods (1,451) and ground movements (620). The most recent was signed on 21 April 2025. 135 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

• 1999Floods and Mudflows · 25 December 1999612 municipalities
• 1999Ground Movements · 25 December 1999612 municipalities
• 1983Floods and Mudflows · 1 April 1983290 municipalities
• 1982Floods and Mudflows · 8 December 198289 municipalities
• 1984Floods and Mudflows · 11 July 198437 municipalities
• 2020Drought (Clay Shrinkage) · 1 July 202021 municipalities

Most Frequently Affected Municipalities

• 16Reims
• 14Pargny-sur-Saulx
• 14Sermaize-les-Bains
• 13Heiltz-le-Maurupt
• 12Fismes
• 10Arrigny
• 10Aÿ-Champagne
• 10Épernay

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