Province of Viterbo
Natural hazards and seismic zone municipality by municipality, for home buyers.
According to ISPRA’s mosaic, 3.5% of the territory of the province of Viterbo has high or very high landslide hazard (P3 and P4), with 4.5% of the residents. 3% of the territory of the province of Viterbo is in the flood area of the medium-probability scenario (P2), with 1% of the residents. Among Italy’s 107 provinces it ranks 67th for landslide hazard P3-P4 and 83rd for flood area (P2).
Municipalities by seismic zone: 40 in zone 2, 20 in zone 3.
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Municipalities by share of territory in landslide class P3/P4
| Acquapendente | 23% |
|---|---|
| Carbognano | 20% |
| Castiglione in Teverina | 13.5% |
| Bassano in Teverina | 11.9% |
| Proceno | 11.4% |
| Cellere | 10.9% |
| Bagnoregio | 10.8% |
| Celleno | 10.7% |
| Lubriano | 10.5% |
| Latera | 10.4% |
Municipalities by share of territory in flood scenario P2
| Orte | 18.3% |
|---|---|
| Tarquinia | 14.4% |
| Bomarzo | 13.1% |
| Graffignano | 11.2% |
| Montalto di Castro | 10.5% |
| Civita Castellana | 8.7% |
| Gallese | 7.4% |
| Proceno | 4.7% |
| Canino | 4.2% |
| Ischia di Castro | 2.3% |
All 60 municipalities
Landslides and floods in the province
| ISPRA indicator | VT | Lazio |
|---|---|---|
| Landslide, very high hazard (P4) | 0.9% | 4.3% |
| Landslide, high hazard (P3) | 2.7% | 1.2% |
| Landslide, areas of attention | 1.9% | 8.3% |
| Residents in landslide areas P3-P4 | 4.5% | 1.5% |
| Buildings in landslide areas P3-P4 | 4.1% | 3.2% |
| Flood, high probability (P3) | 2.4% | 2.6% |
| Flood, medium probability (P2) | 3% | 3.5% |
| Flood, low probability (P1) | 3.4% | 5.7% |
| Residents in P2 flood areas | 1% | 3.2% |
| Buildings in P2 flood areas | 1.7% | 3.4% |
Sources: ISPRA IdroGEO, Civil Protection, Istat (25 October 2026).
Updated on