Mazzo di Valtellina: what to know before buying a home
A municipality in the province of Sondrio, Lombardia. Official data on earthquakes, population, services and transport.
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Search for an address in Mazzo di Valtellina
The report looks at the exact point: landslide and flood risk, seismic zone, price per square metre for the area, services and nearby stops.
For example: Via Vione 1, Mazzo di Valtellina.
Mazzo di Valtellina, the Adda valley and the Mortirolo climb
Cycling fans know Mazzo di Valtellina for the Mortirolo: the classic climb to the pass, the one used by the Giro d'Italia, starts right here on the valley floor. The village lies at around 550 metres in upper Valtellina, along the river Adda, in the stretch of valley between Tirano and Bormio, with wooded slopes rising straight behind the houses.
Life is that of an Alpine valley village, with a car needed for work and services and the main road as the key link. Homes are stone houses in the old core, plus newer villas and small blocks of flats. Winters are those of climate zone F, long and cold, and heating is a major cost: in an older house look at insulation, boiler and windows. Average income is close to the provincial figure, just below it.
The population is almost stable: 1,024 residents in 2023, according to Istat, the national statistics office, 1.6% fewer than in 2011. Mazzo is also younger than the province of Sondrio as a whole, with an average age of 45.2 against 46.8 and over-65s at 21.9% (25.3% in the province). Foreign residents account for 3.2%.
For earthquakes the municipality is in seismic zone 3, like 64 of the 77 municipalities in the province, and the expected ground acceleration in the built-up area is 0.076 g. In the mountains, the more practical concerns are the slopes and the streams running down to the Adda.
The report starts from the Revenue Agency (Agenzia delle Entrate) cadastral maps, published for the municipality, to find the land parcel, and for the same spot it checks the official landslide and flood maps: conditions differ a great deal between the valley floor near the river and the houses set against the slope.
Key points
- Upper Valtellina valley floor, starting point of the Mortirolo climb.
- Population almost stable, 1.6% lower than in 2011.
- Average age 45.2, younger than the province (46.8).
- Seismic zone 3, climate zone F winters.
Overview
Mazzo di Valtellina is a municipality in the province of Sondrio, in Lombardia. At the end of 2023 it had 1,024 residents, ranked 47 of 77 municipalities in the province.
Earthquakes
For Italy's Civil Protection Department, Mazzo di Valtellina is in seismic zone 3, a zone where strong earthquakes are possible but rare. Most municipalities in the province (64 of 77) are in the same zone.
In the built-up area, the expected ground shaking (peak ground acceleration, PGA) is about 0.076 g, a moderate value: the level with a 10% probability of being exceeded in 50 years, on rock.
Even in zone 3, seismic standards apply to new buildings: for an older building, ask about the design year and any structural work.
Population
Compared with the 2011 census, the resident population has fallen by 1.6%. The estimated average age is 45 years, lower than the province average (47). 22% of residents are over 65 (the regional figure is 24%). Foreign residents make up 3.2% of the population. On average, a household has 2.3 members.
Income and climate
In tax year 2024, taxpayers in Mazzo di Valtellina declared an average taxable income of 22,868 euros, in line with the province (23,822 euros). The Italian average is 24,895 euros.
Mazzo di Valtellina is in climate zone F, with 3,032 heating degree days, with no limits on when heating may be used. The same table puts the town hall at 552 metres above sea level.
Services
In the official Ministry of Education and Ministry of Health lists, Mazzo di Valtellina has 1 school and 1 pharmacy. The Overture Maps data also lists 1 healthcare facility.
The data shows no grocery shops and supermarkets within the municipality, against a provincial average of 1.0 per 1,000 residents.
Public transport
The open timetables available for the area do not list any stops within the territory of Mazzo di Valtellina.
How built-up it is
Buildings, roads, car parks and other sealed surfaces cover 5.0% of the land in Mazzo di Valtellina, compared with 2.7% in the province and 12.2% in the region. In 2024 built-up land stayed almost the same.
Radon and contaminated sites
Mazzo di Valtellina is one of the municipalities designated as a radon priority area by the Regione Lombardia in 2023. According to the ISPRA map, the estimated radon emission in the municipality is medium. Radon varies from building to building and can only be known by measuring it, especially on ground floors and in basements.
Official databases list no open contaminated sites in Mazzo di Valtellina; one has been cleaned up or closed.
Landslides and flooding
Landslide and flood hazard changes from one street to the next even within Mazzo di Valtellina: the report checks the address against the ISPRA maps.
House prices
The Revenue Agency's price ranges per square metre (OMI) apply to zones, not to whole municipalities: the report gives the range for the address's zone.
Land registry
The cadastral maps for Mazzo di Valtellina are public: from the address the report finds the sheet and parcel number.
Liveability area by area
The Vicinalia liveability index runs from 0 to 100 and looks at the place, not the people who live there: services within walking distance, transport, green space, natural hazards, air, quiet, buildings and connection. Here it is worked out at the centre of each of the 13 inhabited census areas in Mazzo di Valtellina. Half of the residents live in areas scoring 65 or more.
Residents by band
- fair 35.6%
- good 64.4%
Vicinalia index by census area, licence CC BY-SA 4.0. Data: IdroGEO ISPRA (2026), Istat, INGV, EEA, AGCOM, Overture Maps and OpenStreetMap.
The colour is the value at the centre of the area. For an exact address, search for it above: the free check looks at that exact point. How the index is worked out
Data sources
- Seismic classification of municipalities, Dipartimento della Protezione Civile. Licence CC BY 4.0, updated to 2025-05.
- MPS04 seismic hazard model, INGV. Licence CC BY 4.0, 2004 model.
- Data by census section, Istat. Licence CC BY 4.0, residents at the end of 2023, compared with the 2011 census.
- Places, Overture Maps Foundation. Licence CDLA Permissive 2.0 and others depending on provider, release 2026-10-21.0.
- Public transport timetables (GTFS): Trenord, Regione Lombardia - Trenord, orari ferroviari (GTFS). Licence CC BY 4.0, version 20261111.
- Income and main IRPEF variables by municipality, MEF, Dipartimento delle Finanze. Licence CC BY 3.0 IT, tax year 2024.
- Climate zones and heating degree days of municipalities (Presidential Decree 412/1993, Annex A), Normattiva. Licence CC BY 4.0, current text.
- Land take, territorial dynamics and ecosystem services, ISPRA e SNPA. Licence CC BY 4.0, 2024 data.
- Predictive radon map by municipality, ISPRA. Licence CC BY 4.0, version 2022-11.
- Radon priority areas (Legislative Decree 101/2020), Regione Lombardia, national list compiled by ARPA Lombardia. Licence Atto pubblico (art. 5 L. 633/1941), 2023.
- Contaminated sites, Regione Lombardia. Licence CC0 1.0 (pubblico dominio), updated to 15 November 2026.
- Liveability index by census area, Vicinalia, from the data in the report sections. Licence CC BY-SA 4.0, worked out on 30 September 2026.
- List of Italian municipalities, Istat. Licence CC BY 4.0, updated to 21 February 2026.
ISTAT code 014040. The text on this page is generated automatically from the data.