Buying a home in Castelletto d’Orba
1,855 residents at the 2021 census, 2,045 buildings and 14 km² of territory, Piemonte.
Castelletto d’Orba is in seismic zone 3: in this zone strong earthquakes are less likely than in zones 1 and 2. According to ISPRA’s mosaic, 0.5% of the territory of Castelletto d’Orba has high or very high landslide hazard (P3 and P4), with 0.1% of the residents. 6% of the territory of Castelletto d’Orba is in the flood area of the medium-probability scenario (P2), with 3% of the residents.
Find your address in Castelletto d’Orba
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Castelletto d’Orba compared
| ISPRA indicator | Castelletto d'Orba | AL | Piemonte |
|---|---|---|---|
| Landslide, very high hazard (P4) | 0.4% | 2.7% | 3.1% |
| Landslide, high hazard (P3) | 0.1% | 3.9% | 3.7% |
| Landslide, areas of attention | 0% | 0% | 0% |
| Residents in landslide areas P3-P4 | 0.1% | 1.1% | 1.8% |
| Buildings in landslide areas P3-P4 | 0.1% | 3.8% | 4.4% |
| Flood, high probability (P3) | 1.8% | 9.2% | 5.1% |
| Flood, medium probability (P2) | 6% | 11.9% | 8.3% |
| Flood, low probability (P1) | 7.7% | 19.5% | 13% |
| Residents in P2 flood areas | 3% | 3.2% | 4.9% |
| Buildings in P2 flood areas | 3% | 4% | 5.8% |
Questions
Which seismic zone is Castelletto d’Orba in?
Castelletto d’Orba is in seismic zone 3: in this zone strong earthquakes are less likely than in zones 1 and 2.
How much of Castelletto d’Orba is in landslide class P3/P4?
According to ISPRA’s mosaic, 0.5% of the territory of Castelletto d’Orba has high or very high landslide hazard (P3 and P4), with 0.1% of the residents. By share of territory with landslide hazard P3-P4, Castelletto d’Orba ranks 136th of 187 municipalities in the province of Alessandria, tied with 1 others.
How much of Castelletto d’Orba is in flood scenario P2?
6% of the territory of Castelletto d’Orba is in the flood area of the medium-probability scenario (P2), with 3% of the residents. By share of territory in the P2 flood area, Castelletto d’Orba ranks 96th of 187 municipalities in the province of Alessandria.
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 |
|---|---|---|---|
| Montaldeo | 3 | 1.9% | 0% |
| Silvano d’Orba | 3 | 4.2% | 23.1% |
| San Cristoforo | 3 | 10.6% | 15.1% |
| Parodi Ligure | 3 | 1.9% | 7.4% |
| Francavilla Bisio | 3 | 0.7% | 32.8% |
| Rocca Grimalda | 3 | 2.8% | 2% |
Sources: ISPRA IdroGEO, Civil Protection, Istat (25 October 2026).
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