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Alpes-Maritimes (06)

Biot: geology and natural hazards

What public services say about the ground beneath the commune (population 10,511) 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

Biot at a glance

Seismic zone
3 of 5 (moderate)
Radon potential
Category 2 of 3 (low potential, with aggravating factors)
Recognised natural disasters
30 since 1982
Underground cavities recorded
7
Ground movements recorded
1
Risk prevention plans
2

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 ruissellement et coulée de boue
  • Mouvement de terrain: glissement de terrain, tassements différentiels
  • Séisme
  • Feu de forêt

Recognised natural disasters

30 events recognised as a natural disaster by ministerial order since 1982.

  • Inondations et/ou coulées de boue: 16
  • Mouvement de terrain: 7
  • Sécheresse: 7
  • Tempête: 1

  1. Mouvement de terrain

    Event from 31/01/2024 to 02/02/2024, order published in the Journal officiel on 02/04/2025.

  2. Sécheresse

    Event from 31/03/2023 to 29/06/2023, order published in the Journal officiel on 18/10/2024.

  3. Sécheresse

    Event from 01/04/2022 to 30/09/2022, order published in the Journal officiel on 03/05/2023.

  4. Inondations et/ou coulées de boue

    Event from 01/12/2019 to 02/12/2019, order published in the Journal officiel on 29/01/2020.

  5. 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.

  6. Sécheresse

    Event from 01/04/2016 to 30/09/2016, order published in the Journal officiel on 01/11/2017.

  7. Inondations et/ou coulées de boue

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

  8. Mouvement de terrain

    Event from 03/10/2015 to 04/10/2015, order published in the Journal officiel on 22/01/2016.

  9. Inondations et/ou coulées de boue

    Event from 09/11/2014 to 11/11/2014, order published in the Journal officiel on 04/03/2015.

  10. Inondations et/ou coulées de boue

    Event from 04/11/2014 to 06/11/2014, order published in the Journal officiel on 19/02/2015.

  11. Mouvement de terrain

    Event on 08/02/2014, order published in the Journal officiel on 10/08/2014.

  12. Mouvement de terrain

    Event from 16/01/2014 to 19/01/2014, order published in the Journal officiel on 02/02/2014.

  13. Inondations et/ou coulées de boue

    Event from 04/11/2011 to 06/11/2011, order published in the Journal officiel on 19/11/2011.

  14. Sécheresse

    Event from 01/07/2007 to 30/09/2007, order published in the Journal officiel on 13/08/2008.

  15. Sécheresse

    Event from 01/01/2007 to 31/03/2007, order published in the Journal officiel on 13/08/2008.

  16. Inondations et/ou coulées de boue

    Event from 08/09/2005 to 09/09/2005, order published in the Journal officiel on 30/12/2005.

  17. Sécheresse

    Event from 01/07/2003 to 30/09/2003, order published in the Journal officiel on 01/02/2005.

  18. Inondations et/ou coulées de boue

    Event on 25/12/2000, order published in the Journal officiel on 22/04/2001.

  19. Inondations et/ou coulées de boue

    Event from 05/11/2000 to 06/11/2000, order published in the Journal officiel on 29/12/2000.

  20. Mouvement de terrain

    Event from 14/10/2000 to 16/10/2000, order published in the Journal officiel on 29/12/2000.

  21. Mouvement de terrain

    Event from 11/10/2000 to 15/10/2000, order published in the Journal officiel on 14/06/2001.

  22. Inondations et/ou coulées de boue

    Event on 11/10/2000, order published in the Journal officiel on 14/06/2001.

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

    Event from 23/10/1999 to 24/10/1999, order published in the Journal officiel on 19/03/2000.

  24. Inondations et/ou coulées de boue

    Event from 24/12/1996 to 25/12/1996, order published in the Journal officiel on 12/04/1997.

  25. Inondations et/ou coulées de boue

    Event from 11/01/1996 to 12/01/1996, order published in the Journal officiel on 14/02/1996.

  26. Sécheresse

    Event from 01/09/1995 to 31/12/1995, order published in the Journal officiel on 08/01/2003.

  27. Inondations et/ou coulées de boue

    Event from 05/10/1993 to 10/10/1993, order published in the Journal officiel on 24/10/1993.

  28. Inondations et/ou coulées de boue

    Event from 10/10/1987 to 11/10/1987, order published in the Journal officiel on 16/01/1988.

  29. Inondations et/ou coulées de boue

    Event from 04/10/1987 to 05/10/1987, order published in the Journal officiel on 16/01/1988.

  30. Tempête

    Event from 06/11/1982 to 10/11/1982, order published in the Journal officiel on 22/12/1982.

Earthquakes and radon

Seismic zone

Zone 3 of 5: moderate. This regulatory zoning, in force since 2011, sets the rules for earthquake-resistant construction.

Radon potential

Category 2 of 3: low potential, with aggravating factors. Geological features (faults, mine workings, thermal springs) can make it easier for radon to reach buildings. 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.

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

1 ground movement recorded (landslides, rockfalls, collapses, mudflows…).

See cavities and ground movements on the map

Risk prevention plans

  • PPRN-IF - Biot 2008

    Natural risk prevention plan.

  • PPRN-I - BV Brague 2022

    Natural risk prevention plan, under revision.

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.