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Monteroni d'Arbia: what to know before buying a home

A municipality in the province of Siena, Toscana. Official data on earthquakes, population, services and transport.

Liveability index free for any address

Search for an address in Monteroni d'Arbia

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 Roma 26, Monteroni d'Arbia.

Monteroni d'Arbia, on the Via Cassia south of Siena

Heading south out of Siena, the old Via Cassia reaches Monteroni d'Arbia after about fifteen kilometres. The town grew up in the valley of the Arbia torrent, where the Crete Senesi begin, the bare clay hills that appear on so many postcards of Tuscany. The municipality also includes hamlets such as Ponte d'Arbia, Lucignano d'Arbia and Ville di Corsano, and the Via Francigena pilgrim route crosses it, walked by many people every year.

For many buyers it is a practical choice: country living at lower prices than Siena, with the city a short drive away. The main village has the newer houses and the services; the hamlets and hillside farms offer stone farmhouses, often already restored, some reached by unpaved white roads. In winter the distance to shops and schools is felt more, and the report measures it from the exact location of the house.

Monteroni is younger than the Siena average. At the end of 2023 there were 9,039 residents, up 3.4% since 2011 according to Istat, the national statistics office. The estimated average age is 44.5 against 47.6 for the province, and 22.5% of residents are over 65, compared with 26.9%. Foreign residents account for 11.9%. Declared incomes are just below the provincial average.

The province of Siena has 4 municipalities in seismic zone 2 of the Civil Protection classification and 31 in zone 3, Monteroni among them, with expected ground acceleration here of about 0.141 g. Stone farmhouses often have thick walls but floors and roofs redone at different times, so ask for the permits and, if there is one, the engineer's report on the structure.

Along the Arbia and its side streams the valley floor can flood, while on the clay hills the ground can shift. The report checks the official maps for both hazards at the address and finds the plot on the cadastral maps of the Revenue Agency (Agenzia delle Entrate).

Key points

  • Arbia valley on the Via Cassia and Via Francigena, south of Siena.
  • Population up 3.4%; 22.5% over 65.
  • Seismic zone 3, expected acceleration about 0.141 g.
  • Valley floor and clay hills: flooding and landslides checked per address.

Overview

Monteroni d'Arbia is a municipality in the province of Siena, in Toscana. At the end of 2023 it had 9,039 residents, ranked 8 of 35 municipalities in the province.

Earthquakes

For Italy's Civil Protection Department, Monteroni d'Arbia is in seismic zone 3, a zone where strong earthquakes are possible but rare. Most municipalities in the province (31 of 35) are in the same zone.

In the built-up area, the expected ground shaking (peak ground acceleration, PGA) is about 0.141 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 grown by 3.4%. The estimated average age is 45 years, lower than the province average (48). 23% of residents are over 65 (the regional figure is 26%). Foreign residents make up 11.9% of the population. On average, a household has 2.4 members.

Income and climate

In tax year 2024, taxpayers in Monteroni d'Arbia declared an average taxable income of 24,604 euros, in line with the province (25,404 euros). The Italian average is 24,895 euros.

Monteroni d'Arbia is in climate zone D, with 1,621 heating degree days: heating may be switched on from 1 November to 15 April, for up to 12 hours a day. The same table puts the town hall at 161 metres above sea level.

Services

In the official Ministry of Education and Ministry of Health lists, Monteroni d'Arbia has 6 schools and 3 pharmacies. The Overture Maps data also lists 5 grocery shops and supermarkets, 2 healthcare facilities, 8 sports facilities and 1 green area.

There are 0.2 healthcare facilities per 1,000 residents, fewer than the province average (0.6).

Public transport

We do not yet have open public transport timetables for this municipality: the report says so explicitly, without inventing distances.

How built-up it is

Buildings, roads, car parks and other sealed surfaces cover 4.1% of the land in Monteroni d'Arbia, compared with 4.0% in the province and 6.2% in the region. In 2024 built-up land stayed almost the same.

Radon and contaminated sites

Monteroni d'Arbia is not among the radon priority areas designated by the Regione Toscana in 2025. 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 Monteroni d'Arbia; one has been cleaned up or closed.

Landslides and flooding

Landslide and flood hazard changes from one street to the next even within Monteroni d'Arbia: 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 Monteroni d'Arbia 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 61 inhabited census areas in Monteroni d'Arbia. Half of the residents live in areas scoring 64 or more.

Residents by band

  • fair 53.5%
  • good 46.5%

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

ISTAT code 052017. The text on this page is generated automatically from the data.