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Tarn-et-Garonne (82)

Moissac: geology and natural hazards

What public services say about the ground beneath the commune (population 13,419) 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

Moissac at a glance

Seismic zone
1 of 5 (very low)
Radon potential
Category 1 of 3 (low potential)
Recognised natural disasters
30 since 1982
Underground cavities recorded
5
Ground movements recorded
5
Risk prevention plans
3

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 à débordement lent de cours d’eau
  • Mouvement de terrain: tassements différentiels
  • Transport de marchandises dangereuses

Recognised natural disasters

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

  • Sécheresse: 17
  • Inondations et/ou coulées de boue: 13
  • Mouvement de terrain: 1
  • Tempête: 1

  1. Inondations et/ou coulées de boue

    Event from 08/02/2026 to 23/02/2026, order published in the Journal officiel on 03/03/2026.

  2. Inondations et/ou coulées de boue

    Event from 18/05/2025 to 19/05/2025, order published in the Journal officiel on 28/05/2025.

  3. Inondations et/ou coulées de boue

    Event from 20/06/2023 to 22/06/2023, order published in the Journal officiel on 28/07/2023.

  4. Sécheresse

    Event from 01/07/2022 to 30/09/2022, order published in the Journal officiel on 10/06/2023.

  5. Inondations et/ou coulées de boue

    Event from 10/06/2018 to 11/06/2018, order published in the Journal officiel on 15/08/2018.

  6. Sécheresse

    Event from 01/01/2017 to 31/12/2017, order published in the Journal officiel on 20/10/2018.

  7. Inondations et/ou coulées de boue

    Event on 31/08/2015, order published in the Journal officiel on 08/10/2015.

  8. Sécheresse

    Event from 01/01/2015 to 30/06/2015, order published in the Journal officiel on 16/12/2016.

  9. Sécheresse

    Event from 01/01/2012 to 31/12/2012, order published in the Journal officiel on 25/05/2013.

  10. Sécheresse

    Event from 01/04/2011 to 30/06/2011, order published in the Journal officiel on 17/07/2012.

  11. Sécheresse

    Event from 01/01/2009 to 27/10/2009, order published in the Journal officiel on 13/01/2011.

  12. Sécheresse

    Event from 01/07/2008 to 30/09/2008, order published in the Journal officiel on 27/06/2009.

  13. Sécheresse

    Event from 01/01/2008 to 31/03/2008, order published in the Journal officiel on 27/06/2009.

  14. Inondations et/ou coulées de boue

    Event from 25/05/2007 to 26/05/2007, order published in the Journal officiel on 10/07/2007.

  15. Sécheresse

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

  16. Sécheresse

    Event from 01/01/2006 to 31/03/2006, order published in the Journal officiel on 04/04/2008.

  17. Sécheresse

    Event from 01/07/2005 to 30/09/2005, order published in the Journal officiel on 22/02/2008.

  18. Inondations et/ou coulées de boue

    Event from 03/12/2003 to 05/12/2003, order published in the Journal officiel on 13/12/2003.

  19. Sécheresse

    Event from 01/07/2003 to 30/09/2003, order published in the Journal officiel on 26/08/2004.

  20. Sécheresse

    Event from 01/01/2002 to 31/12/2002, order published in the Journal officiel on 19/10/2003.

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

    Event from 25/12/1999 to 29/12/1999, order published in the Journal officiel on 30/12/1999.

  22. Inondations et/ou coulées de boue

    Event from 06/12/1996 to 10/12/1996, order published in the Journal officiel on 05/02/1997.

  23. Sécheresse

    Event from 01/10/1996 to 30/06/1998, order published in the Journal officiel on 03/04/1999.

  24. Inondations et/ou coulées de boue

    Event from 09/01/1996 to 10/01/1996, order published in the Journal officiel on 14/02/1996.

  25. Inondations et/ou coulées de boue

    Event from 05/07/1993 to 06/07/1993, order published in the Journal officiel on 10/10/1993.

  26. Inondations et/ou coulées de boue

    Event from 31/05/1992 to 01/06/1992, order published in the Journal officiel on 16/01/1993.

  27. Sécheresse

    Event from 01/01/1992 to 30/09/1996, order published in the Journal officiel on 30/12/1997.

  28. Sécheresse

    Event from 01/01/1991 to 31/12/1991, order published in the Journal officiel on 07/02/1993.

  29. Sécheresse

    Event from 01/05/1989 to 31/12/1990, order published in the Journal officiel on 30/08/1991.

  30. Inondations et/ou coulées de boue, Tempête

    Event from 06/11/1982 to 10/11/1982, order published in the Journal officiel on 19/11/1982.

Earthquakes and radon

Seismic zone

Zone 1 of 5: very low. This regulatory zoning, in force since 2011, sets the rules for earthquake-resistant construction.

Radon potential

Category 1 of 3: low potential. The geological formations have the lowest 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.

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

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

See cavities and ground movements on the map

Risk prevention plans

  • PPRN Retrait-gonflement argiles

    Natural risk prevention plan.

  • PPR Glissement terrains MOISSAC

    Natural risk prevention plan.

  • PPRN-i - Tarn révision n°4

    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.