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Fréjus: geology and natural hazards

What public services say about the ground beneath the commune (population 59,719) and the hazards it faces: natural disasters, earthquakes, radon, cavities, clays, groundwater and rocks.

Hazard names and other data are quoted as their producers publish them, in French.

Explore the commune on the map

Fréjus at a glance

Seismic zone
2 of 5 (low)
Radon potential
Category 3 of 3 (significant potential)
Recognised natural disasters
33 since 1983
Underground cavities recorded
18
Ground movements recorded
6
Risk prevention plans
4

Hazards listed by the French State

Natural and technological hazards to which the commune is exposed, according to the national GASPAR database.

  • Inondation: par une crue torrentielle ou à montée rapide de cours d’eau, par submersion marine
  • Mouvement de terrain: affaissements et effondrements d’origine anthropique (anciennes carrières souterraines, hors mines), eboulement ou chutes de pierres et de blocs, glissement de terrain, recul du trait de côte et de falaises, tassements différentiels
  • Séisme
  • Feu de forêt
  • Radon
  • Risque industriel
  • Transport de marchandises dangereuses

Recognised natural disasters

33 events recognised as a natural disaster by ministerial order since 1983.

  • Inondations et/ou coulées de boue: 23
  • Sécheresse: 5
  • Mouvement de terrain: 4
  • Chocs mécaniques liés à l’action des vagues: 2

  1. Inondations et/ou coulées de boue

    Event from 24/10/2024 to 26/10/2024, order published in the Journal officiel on 20/12/2024.

  2. Inondations et/ou coulées de boue

    Event on 03/09/2024, order published in the Journal officiel on 31/10/2024.

  3. Inondations et/ou coulées de boue

    Event from 09/03/2024 to 10/03/2024, order published in the Journal officiel on 27/04/2024.

  4. Sécheresse

    Event from 01/04/2023 to 30/09/2023, order published in the Journal officiel on 02/07/2024.

  5. Sécheresse

    Event from 01/04/2022 to 31/12/2022, order published in the Journal officiel on 03/05/2023.

  6. Sécheresse

    Event from 01/04/2020 to 30/06/2020, order published in the Journal officiel on 14/01/2022.

  7. Inondations et/ou coulées de boue

    Event from 01/12/2019 to 02/12/2019, order published in the Journal officiel on 19/12/2019.

  8. Mouvement de terrain

    Event from 01/12/2019 to 02/12/2019, order published in the Journal officiel on 30/03/2022.

  9. Inondations et/ou coulées de boue

    Event from 23/11/2019 to 24/11/2019, order published in the Journal officiel on 30/11/2019.

  10. Chocs mécaniques liés à l’action des vagues

    Event from 23/11/2019 to 24/11/2019, order published in the Journal officiel on 13/03/2020.

  11. Mouvement de terrain

    Event from 23/11/2019 to 24/11/2019, order published in the Journal officiel on 01/08/2021.

  12. Inondations et/ou coulées de boue

    Event on 10/10/2018, order published in the Journal officiel on 12/06/2020.

  13. Inondations et/ou coulées de boue

    Event on 03/10/2015, order published in the Journal officiel on 08/10/2015.

  14. Inondations et/ou coulées de boue

    Event from 25/11/2014 to 27/11/2014, order published in the Journal officiel on 04/12/2014.

  15. Inondations et/ou coulées de boue

    Event from 18/01/2014 to 20/01/2014, order published in the Journal officiel on 02/02/2014.

  16. Inondations et/ou coulées de boue

    Event from 04/11/2011 to 10/11/2011, order published in the Journal officiel on 19/11/2011.

  17. Inondations et/ou coulées de boue

    Event from 15/06/2010 to 16/06/2010, order published in the Journal officiel on 22/06/2010.

  18. Chocs mécaniques liés à l’action des vagues

    Event on 04/05/2010, order published in the Journal officiel on 26/06/2010.

  19. Inondations et/ou coulées de boue

    Event from 18/09/2009 to 19/09/2009, order published in the Journal officiel on 21/10/2009.

  20. Inondations et/ou coulées de boue

    Event from 02/12/2006 to 03/12/2006, order published in the Journal officiel on 01/04/2007.

  21. Inondations et/ou coulées de boue

    Event from 11/08/2005 to 12/08/2005, order published in the Journal officiel on 11/03/2006.

  22. Sécheresse

    Event from 01/01/2002 to 30/06/2002, order published in the Journal officiel on 26/07/2003.

  23. Sécheresse

    Event from 01/02/1998 to 30/06/1999, order published in the Journal officiel on 26/07/2003.

  24. Inondations et/ou coulées de boue

    Event from 10/01/1996 to 14/01/1996, order published in the Journal officiel on 14/02/1996.

  25. Mouvement de terrain

    Event from 10/01/1996 to 27/01/1996, order published in the Journal officiel on 17/10/1996.

  26. Inondations et/ou coulées de boue

    Event from 25/06/1994 to 26/06/1994, order published in the Journal officiel on 25/09/1994.

  27. Inondations et/ou coulées de boue

    Event from 06/01/1994 to 12/01/1994, order published in the Journal officiel on 10/06/1994.

  28. Inondations et/ou coulées de boue

    Event from 05/10/1993 to 06/10/1993, order published in the Journal officiel on 30/12/1993.

  29. Inondations et/ou coulées de boue

    Event from 26/09/1992 to 27/09/1992, order published in the Journal officiel on 08/07/1993.

  30. Inondations et/ou coulées de boue

    Event from 21/09/1992 to 23/09/1992, order published in the Journal officiel on 08/07/1993.

  31. Inondations et/ou coulées de boue

    Event on 17/10/1990, order published in the Journal officiel on 07/02/1991.

  32. Inondations et/ou coulées de boue

    Event from 10/10/1987 to 11/10/1987, order published in the Journal officiel on 20/02/1988.

  33. Inondations et/ou coulées de boue, Mouvement de terrain

    Event from 23/08/1983 to 24/08/1983, order published in the Journal officiel on 18/11/1983.

Earthquakes and radon

Seismic zone

Zone 2 of 5: low. This regulatory zoning, in force since 2011, sets the rules for earthquake-resistant construction.

Radon potential

Category 3 of 3: significant potential. At least part of the commune has higher-than-average uranium content. Radon is a naturally occurring radioactive gas that can build up in poorly ventilated rooms.

Beneath the town hall

What BRGM maps say at the town hall. They describe that single point: elsewhere in the commune, the ground may be quite different.

  • Shrink-swell clays

  • Rising groundwater

  • Underground cavities

  • Ground movements

  • Earthquakes

  • Nature of the ground

Cavities and ground movements

Recorded across the whole commune by BRGM, in its national databases of underground cavities and ground movements.

18 underground cavities recorded (quarries, cellars, military works, natural cavities…).

6 ground movements recorded (landslides, rockfalls, collapses, mudflows…).

See cavities and ground movements on the map

Risk prevention plans

  • PPRN-I - Fréjus [ BV Pédégal - Valescure ] 2015 Révision 1

    Natural risk prevention plan, under revision.

  • PPRN-I - Fréjus [ BV Pédégal - Valescure ] 2002

    Natural risk prevention plan.

  • PPRN-IF - Fréjus 2006 [ MOD 1 - 2009, MOD 2 - 2012 ]

    Natural risk prevention plan.

  • PPRN-I - BV Argens & Reyran - Frejus

    Natural risk prevention plan.

The zoning and regulations of each plan, which may prohibit or restrict building, can be consulted at the town hall and on Géorisques.

Nearby communes

Sources and limitations

Listed hazards, natural disasters, seismic zoning, radon potential, cavities, ground movements and prevention plans: Géorisques, published by the French ministry for the ecological transition, under Licence Ouverte Etalab 2.0, data accessed on 03/11/2026. Summary beneath the town hall: BRGM map services, queried when the page is displayed. List of communes and populations: API Découpage administratif (geo.api.gouv.fr), d’après le code officiel géographique de l’Insee, version of 30/10/2026.

This information reflects the state of knowledge at the scale of the commune or of a single point. It replaces neither a soil survey nor the official risk statement (état des risques) required for a sale or a rental, which is drawn up on the official French government service.