Buying a home in Siena
53,062 residents at the 2021 census, 19,314 buildings and 118.5 km² of territory, Toscana.
Siena is in seismic zone 3: in this zone strong earthquakes are less likely than in zones 1 and 2. According to ISPRA’s mosaic, 7.4% of the territory of Siena has high or very high landslide hazard (P3 and P4), with 1.7% of the residents. 9.9% of the territory of Siena is in the flood area of the medium-probability scenario (P2), with 2% of the residents.
Find your address in Siena
The preview is free: the parcel, the seismic zone and the types of flags. The full dossier costs €29 including applicable VAT.
Siena compared
| ISPRA indicator | Siena | SI | Toscana |
|---|---|---|---|
| Landslide, very high hazard (P4) | 1.2% | 4.7% | 4.6% |
| Landslide, high hazard (P3) | 6.2% | 14.1% | 16.4% |
| Landslide, areas of attention | 0% | 0% | 0.6% |
| Residents in landslide areas P3-P4 | 1.7% | 5.2% | 5% |
| Buildings in landslide areas P3-P4 | 0.8% | 5.9% | 8.1% |
| Flood, high probability (P3) | 2.2% | 3.9% | 6.2% |
| Flood, medium probability (P2) | 9.9% | 8.9% | 12.2% |
| Flood, low probability (P1) | 19.7% | 15.8% | 21.2% |
| Residents in P2 flood areas | 2% | 5.1% | 25.6% |
| Buildings in P2 flood areas | 2.8% | 4.8% | 22.2% |
Questions
Which seismic zone is Siena in?
Siena is in seismic zone 3: in this zone strong earthquakes are less likely than in zones 1 and 2.
How much of Siena is in landslide class P3/P4?
According to ISPRA’s mosaic, 7.4% of the territory of Siena has high or very high landslide hazard (P3 and P4), with 1.7% of the residents. By share of territory with landslide hazard P3-P4, Siena ranks 27th of 35 municipalities in the province of Siena.
How much of Siena is in flood scenario P2?
9.9% of the territory of Siena is in the flood area of the medium-probability scenario (P2), with 2% of the residents. By share of territory in the P2 flood area, Siena ranks 12th of 35 municipalities in the province of Siena.
Guides: seismic zone · landslides and floods · what to check before an offer. OMI prices: GEOPOI (how to read them).
Nearby municipalities
| Municipality | Seismic zone | Landslide P3-P4 | Flood P2 |
|---|---|---|---|
| Monteroni d’Arbia | 3 | 4.5% | 13.3% |
| Monteriggioni | 3 | 2.4% | 3.4% |
| Castelnuovo Berardenga | 3 | 9.2% | 9% |
| Sovicille | 3 | 5.6% | 23% |
| Gaiole in Chianti | 3 | 3.5% | 0.3% |
| Murlo | 3 | 3.5% | 0.8% |
Sources: ISPRA IdroGEO, Civil Protection, Istat (25 October 2026).
Updated on