Province of Siena
Natural hazards and seismic zone municipality by municipality, for home buyers.
According to ISPRA’s mosaic, 18.8% of the territory of the province of Siena has high or very high landslide hazard (P3 and P4), with 5.2% of the residents. 8.9% of the territory of the province of Siena is in the flood area of the medium-probability scenario (P2), with 5.1% of the residents. Among Italy’s 107 provinces it ranks 14th for landslide hazard P3-P4 and 43rd for flood area (P2).
Municipalities by seismic zone: 4 in zone 2, 31 in zone 3.
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Municipalities by share of territory in landslide class P3/P4
| Radicondoli | 46.1% |
|---|---|
| Abbadia San Salvatore | 43.6% |
| Castiglione d’Orcia | 43.2% |
| San Quirico d’Orcia | 41.5% |
| Pienza | 40% |
| Montalcino | 39.4% |
| Trequanda | 33.4% |
| Asciano | 31.5% |
| Chiusi | 22.1% |
| Casole d’Elsa | 19.6% |
Municipalities by share of territory in flood scenario P2
| Chiusi | 31.1% |
|---|---|
| Sinalunga | 23.6% |
| Sovicille | 23% |
| Montepulciano | 22.7% |
| Buonconvento | 20.3% |
| Torrita di Siena | 17.9% |
| Montalcino | 14.2% |
| Castiglione d’Orcia | 13.7% |
| Monteroni d’Arbia | 13.3% |
| Rapolano Terme | 11.3% |
All 35 municipalities
| Municipality | Seismic zone | Landslide P3-P4 | Flood P2 |
|---|---|---|---|
| Abbadia San Salvatore | 2 | 43.6% | 0.9% |
| Asciano | 3 | 31.5% | 10.3% |
| Buonconvento | 3 | 19.3% | 20.3% |
| Casole d’Elsa | 3 | 19.6% | 4.5% |
| Castellina in Chianti | 3 | 16.5% | 1.6% |
| Castelnuovo Berardenga | 3 | 9.2% | 9% |
| Castiglione d’Orcia | 3 | 43.2% | 13.7% |
| Cetona | 3 | 16.3% | 6.5% |
| Chianciano Terme | 3 | 17.2% | 2.5% |
| Chiusdino | 3 | 13.7% | 9.6% |
| Chiusi | 3 | 22.1% | 31.1% |
| Colle di Val d’Elsa | 3 | 10.2% | 0.3% |
| Gaiole in Chianti | 3 | 3.5% | 0.3% |
| Montalcino | 3 | 39.4% | 14.2% |
| Montepulciano | 3 | 6.3% | 22.7% |
| Monteriggioni | 3 | 2.4% | 3.4% |
| Monteroni d’Arbia | 3 | 4.5% | 13.3% |
| Monticiano | 3 | 11.5% | 2.6% |
| Murlo | 3 | 3.5% | 0.8% |
| Piancastagnaio | 2 | 15.3% | 1.6% |
| Pienza | 3 | 40% | 8.1% |
| Poggibonsi | 3 | 10.3% | 7.1% |
| Radda in Chianti | 3 | 12.6% | 1.1% |
| Radicofani | 2 | 13.3% | 0.3% |
| Radicondoli | 3 | 46.1% | 8.1% |
| Rapolano Terme | 3 | 12.3% | 11.3% |
| San Casciano dei Bagni | 2 | 13.4% | 1.4% |
| San Gimignano | 3 | 18.7% | 2.7% |
| San Quirico d’Orcia | 3 | 41.5% | 8.2% |
| Sarteano | 3 | 6% | 0.4% |
| Siena | 3 | 7.4% | 9.9% |
| Sinalunga | 3 | 1.7% | 23.6% |
| Sovicille | 3 | 5.6% | 23% |
| Torrita di Siena | 3 | 8.5% | 17.9% |
| Trequanda | 3 | 33.4% | 0.8% |
Landslides and floods in the province
| ISPRA indicator | SI | Toscana |
|---|---|---|
| Landslide, very high hazard (P4) | 4.7% | 4.6% |
| Landslide, high hazard (P3) | 14.1% | 16.4% |
| Landslide, areas of attention | 0% | 0.6% |
| Residents in landslide areas P3-P4 | 5.2% | 5% |
| Buildings in landslide areas P3-P4 | 5.9% | 8.1% |
| Flood, high probability (P3) | 3.9% | 6.2% |
| Flood, medium probability (P2) | 8.9% | 12.2% |
| Flood, low probability (P1) | 15.8% | 21.2% |
| Residents in P2 flood areas | 5.1% | 25.6% |
| Buildings in P2 flood areas | 4.8% | 22.2% |
Sources: ISPRA IdroGEO, Civil Protection, Istat (25 October 2026).
Updated on