Buying a home in Castelletto Merli
452 residents at the 2021 census, 721 buildings and 11.6 km² of territory, Piemonte.
Castelletto Merli is in seismic zone 4: the least hazardous zone: the probability of an earthquake is very low. According to ISPRA’s mosaic, 4.1% of the territory of Castelletto Merli has high or very high landslide hazard (P3 and P4), with 2.4% of the residents. 4.1% of the territory of Castelletto Merli is in the flood area of the medium-probability scenario (P2), with 6.6% of the residents.
Find your address in Castelletto Merli
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Castelletto Merli compared
| ISPRA indicator | Castelletto Merli | AL | Piemonte |
|---|---|---|---|
| Landslide, very high hazard (P4) | 2.6% | 2.7% | 3.1% |
| Landslide, high hazard (P3) | 1.5% | 3.9% | 3.7% |
| Landslide, areas of attention | 0% | 0% | 0% |
| Residents in landslide areas P3-P4 | 2.4% | 1.1% | 1.8% |
| Buildings in landslide areas P3-P4 | 0.4% | 3.8% | 4.4% |
| Flood, high probability (P3) | 3.9% | 9.2% | 5.1% |
| Flood, medium probability (P2) | 4.1% | 11.9% | 8.3% |
| Flood, low probability (P1) | 4.1% | 19.5% | 13% |
| Residents in P2 flood areas | 6.6% | 3.2% | 4.9% |
| Buildings in P2 flood areas | 4.1% | 4% | 5.8% |
Questions
Which seismic zone is Castelletto Merli in?
Castelletto Merli is in seismic zone 4: the least hazardous zone: the probability of an earthquake is very low.
How much of Castelletto Merli is in landslide class P3/P4?
According to ISPRA’s mosaic, 4.1% of the territory of Castelletto Merli has high or very high landslide hazard (P3 and P4), with 2.4% of the residents. By share of territory with landslide hazard P3-P4, Castelletto Merli ranks 83rd of 187 municipalities in the province of Alessandria.
How much of Castelletto Merli is in flood scenario P2?
4.1% of the territory of Castelletto Merli is in the flood area of the medium-probability scenario (P2), with 6.6% of the residents. By share of territory in the P2 flood area, Castelletto Merli ranks 116th 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 |
|---|---|---|---|
| Odalengo Piccolo | 4 | 13.7% | 0% |
| Ponzano Monferrato | 4 | 7.7% | 0.1% |
| Moncalvo | 4 | 6.5% | 0.9% |
| Serralunga di Crea | 4 | 2.4% | 18% |
| Cerrina Monferrato | 4 | 11.2% | 6.7% |
| Alfiano Natta | 4 | 8.7% | 1.1% |
Sources: ISPRA IdroGEO, Civil Protection, Istat (25 October 2026).
Updated on