Question 1

What is the population of Grande-Synthe?

Accepted Answer

The commune of Grande-Synthe has 20,347 inhabitants per the INSEE census.

Question 2

Are there natural risks in Grande-Synthe?

Accepted Answer

Yes, Grande-Synthe is exposed to 8 natural risk(s): Engins de guerre, Inondation, Mouvement de terrain, Nucléaire, Risque industriel, Rupture de barrage, Séisme, Transport de marchandises dangereuses. Source: Géorisques / GASPAR.

Question 3

What is the energy performance of homes in Grande-Synthe?

Accepted Answer

Out of 1,147 ADEME EPCs available in Grande-Synthe, the most common label is D. 2% are rated A or B.

Question 4

What is the crime rate in Grande-Synthe?

Accepted Answer

In 2025, the crime rate in Grande-Synthe was 30.7 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 Grande-Synthe?

Accepted Answer

Tap water in Grande-Synthe is compliant with quality standards. Source: ARS / Hub'eau. (390 analyses over 12 months)

Question 6

What is the air quality in Grande-Synthe?

Accepted Answer

According to LCSQA stations (5-year mean) in Grande-Synthe: PM2.5 : 10.8 µg/m³, NO₂ : 13.5 µg/m³, PM10 : 20.7 µg/m³. Source: LCSQA / Géod'air.