Chelles: geology and natural hazards

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: affaissements et effondrements d’origine anthropique (anciennes carrières souterraines, hors mines), tassements différentiels
• Transport de marchandises dangereuses

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

• Inondations et/ou coulées de boue: 14
• Sécheresse: 12
• Glissement de terrain: 1
• Mouvement de terrain: 1

1. Inondations et/ou coulées de boue

   Event from 13/07/2021 to 14/07/2021, order published in the Journal officiel on 28/09/2021.

2. Inondations et/ou coulées de boue

   Event from 19/06/2021 to 20/06/2021, order published in the Journal officiel on 02/07/2021.

3. Sécheresse

   Event from 01/07/2020 to 30/09/2020, order published in the Journal officiel on 06/06/2021.

4. Sécheresse

   Event from 01/10/2018 to 31/12/2018, order published in the Journal officiel on 17/07/2019.

5. Inondations et/ou coulées de boue

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

6. Inondations et/ou coulées de boue

   Event from 15/01/2018 to 05/02/2018, order published in the Journal officiel on 15/02/2018.

7. Sécheresse

   Event from 01/04/2011 to 30/06/2011, order published in the Journal officiel on 02/08/2012.

8. Sécheresse

   Event from 01/01/2006 to 31/03/2006, order published in the Journal officiel on 14/06/2008.

9. Sécheresse

   Event from 01/07/2005 to 30/09/2005, order published in the Journal officiel on 14/06/2008.

10. Sécheresse

    Event from 01/01/2005 to 31/03/2005, order published in the Journal officiel on 14/06/2008.

11. Sécheresse

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

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

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

13. Inondations et/ou coulées de boue

    Event from 11/07/1995 to 12/07/1995, order published in the Journal officiel on 28/01/1996.

14. Inondations et/ou coulées de boue

    Event from 17/01/1995 to 31/01/1995, order published in the Journal officiel on 08/02/1995.

15. Inondations et/ou coulées de boue

    Event from 19/12/1993 to 15/01/1994, order published in the Journal officiel on 29/04/1994.

16. Sécheresse

    Event from 01/10/1993 to 31/08/1998, order published in the Journal officiel on 11/12/1998.

17. Sécheresse

    Event from 01/10/1992 to 30/11/1996, order published in the Journal officiel on 19/07/1997.

18. Sécheresse

    Event from 01/01/1992 to 30/09/1993, order published in the Journal officiel on 09/07/1994.

19. Sécheresse

    Event from 01/01/1991 to 31/12/1991, order published in the Journal officiel on 05/11/1992.

20. Inondations et/ou coulées de boue

    Event on 27/06/1990, order published in the Journal officiel on 19/12/1990.

21. Sécheresse

    Event from 01/05/1989 to 31/12/1990, order published in the Journal officiel on 27/12/1991.

22. Inondations et/ou coulées de boue

    Event from 16/08/1983 to 17/08/1983, order published in the Journal officiel on 08/10/1983.

23. Inondations et/ou coulées de boue

    Event from 23/06/1983 to 26/06/1983, order published in the Journal officiel on 08/10/1983.

24. Inondations et/ou coulées de boue, Glissement de terrain

    Event from 30/05/1983 to 06/06/1983, order published in the Journal officiel on 26/07/1983.

25. Inondations et/ou coulées de boue

    Event from 01/04/1983 to 28/04/1983, order published in the Journal officiel on 18/05/1983.

26. Inondations et/ou coulées de boue

    Event from 08/12/1982 to 31/12/1982, order published in the Journal officiel on 13/01/1983.

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.

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

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…).

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

See cavities and ground movements on the map

• PSS vallée de la Marne

  Natural risk prevention plan.

• PPRMT Chelles

  Natural risk prevention plan.

• PPRsecheresse Chelles

  Natural risk prevention plan.

• PPRI Marne de Vaires à Chelles

  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.

• Gournay-sur-Marne (93)
• Champs-sur-Marne (77)
• Brou-sur-Chantereine (77)
• Montfermeil (93)
• Vaires-sur-Marne (77)
• Noisiel (77)
• Gagny (93)
• Noisy-le-Grand (93)

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 02/11/2026. 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.