Buying a home in Sostegno
740 residents at the 2021 census, 966 buildings and 18.1 km² of territory, Piemonte.
Sostegno is in seismic zone 4: the least hazardous zone: the probability of an earthquake is very low. According to ISPRA’s mosaic, 0.1% of the territory of Sostegno has high or very high landslide hazard (P3 and P4), with 1.2% of the residents. 1.6% of the territory of Sostegno is in the flood area of the medium-probability scenario (P2), with 0% of the residents.
Find your address in Sostegno
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Sostegno compared
| ISPRA indicator | Sostegno | BI | Piemonte |
|---|---|---|---|
| Landslide, very high hazard (P4) | 0% | 0.5% | 3.1% |
| Landslide, high hazard (P3) | 0.1% | 1% | 3.7% |
| Landslide, areas of attention | 0% | 0% | 0% |
| Residents in landslide areas P3-P4 | 1.2% | 0.8% | 1.8% |
| Buildings in landslide areas P3-P4 | 0.5% | 1.1% | 4.4% |
| Flood, high probability (P3) | 1.6% | 2.6% | 5.1% |
| Flood, medium probability (P2) | 1.6% | 4.2% | 8.3% |
| Flood, low probability (P1) | 1.6% | 6.5% | 13% |
| Residents in P2 flood areas | 0% | 3.4% | 4.9% |
| Buildings in P2 flood areas | 0% | 3.1% | 5.8% |
Questions
Which seismic zone is Sostegno in?
Sostegno is in seismic zone 4: the least hazardous zone: the probability of an earthquake is very low.
How much of Sostegno is in landslide class P3/P4?
According to ISPRA’s mosaic, 0.1% of the territory of Sostegno has high or very high landslide hazard (P3 and P4), with 1.2% of the residents. By share of territory with landslide hazard P3-P4, Sostegno ranks 52nd of 74 municipalities in the province of Biella, tied with 1 others.
How much of Sostegno is in flood scenario P2?
1.6% of the territory of Sostegno is in the flood area of the medium-probability scenario (P2), with 0% of the residents. By share of territory in the P2 flood area, Sostegno ranks 30th of 74 municipalities in the province of Biella, tied with 1 others.
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 |
|---|---|---|---|
| Serravalle Sesia | 4 | 0.2% | 14.3% |
| Villa del Bosco | 4 | 0% | 2% |
| Curino | 4 | 0% | 0% |
| Lozzolo | 4 | 0% | 3.7% |
| Grignasco | 4 | 0.1% | 13.7% |
| Roasio | 4 | 0% | 17.8% |
Sources: ISPRA IdroGEO, Civil Protection, Istat (25 October 2026).
Updated on