Question 1

What is the population of Lagny-sur-Marne?

Accepted Answer

The commune of Lagny-sur-Marne has 21,433 inhabitants per the INSEE census.

Question 2

Are there natural risks in Lagny-sur-Marne?

Accepted Answer

Yes, Lagny-sur-Marne is exposed to 6 natural risk(s): Affaissements et effondrements d'origine anthropique (anciennes carrières souterraines, hors mines), Inondation, Mouvement de terrain, Par une crue à débordement lent de cours d'eau, Tassements différentiels, Transport de marchandises dangereuses. Source: Géorisques / GASPAR.

Question 3

What is the energy performance of homes in Lagny-sur-Marne?

Accepted Answer

Out of 805 ADEME EPCs available in Lagny-sur-Marne, the most common label is D. 3% are rated A or B.

Question 4

What is the crime rate in Lagny-sur-Marne?

Accepted Answer

In 2025, the crime rate in Lagny-sur-Marne was 37.8 offences per 1,000 inhabitants (burglaries, theft, violence, vandalism). Source: SSMSI / French Ministry of the Interior.

Question 5

Is the tap water safe to drink in Lagny-sur-Marne?

Accepted Answer

Tap water in Lagny-sur-Marne is compliant with quality standards. Source: ARS / Hub'eau. (243 analyses over 12 months)

Question 6

What is the air quality in Lagny-sur-Marne?

Accepted Answer

According to LCSQA stations (5-year mean) in Lagny-sur-Marne: PM2.5 : 10.7 µg/m³, NO₂ : 20.3 µg/m³, PM10 : 16.5 µg/m³. Source: LCSQA / Géod'air.