San Pier d'Isonzo: what to know before buying a home
A municipality in the province of Gorizia, Friuli-Venezia Giulia. Official data on earthquakes, population, services and transport.
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For example: Via Guglielmo Oberdan 1, San Pier d'Isonzo.
San Pier d'Isonzo, the plain of the Bisiacaria
San Pier d'Isonzo is a lowland village in the Bisiacaria, the area between the lower Isonzo river and the Karst plateau, a few kilometres from Monfalcone in north-east Italy. The land is flat, below 20 metres, with fields, vineyards and small hamlets, and the river close by. Monfalcone, Gorizia and Trieste are the places people work, all a short drive away, and the motorway to Trieste and Venice is close.
The market is detached houses, villas and small blocks of flats, with a few old farmhouses of brick and river stone. Buyers from outside the region should know one thing: the tavolare system applies here, a land register (libro fondiario) inherited from Austrian rule. Ownership passes when the transfer is entered in the land book, and the notary handles this routinely. For parcel maps, however, the Revenue Agency (Agenzia delle Entrate) publishes data for this municipality too, so the report can trace the address to the plot.
At the end of 2023 there were 1,940 residents, down 3.9% on 2011, according to Istat, the national statistics office. The average age is 48.9, close to 48.0 for the province of Gorizia, and over-65s make up 27.4%. Foreign residents are 4.9%. Declared incomes are a little above the provincial average.
The municipality is in seismic zone 3, with an expected ground acceleration of 0.144 g, like 14 other municipalities in the province of Gorizia. For a house built before recent rules, ask for the design and any structural work done.
On a plain near a large river, flooding is the main question, and the report reads the official flood hazard maps for the address, which can change a great deal from one street to the next.
Key points
- Bisiacaria plain, near Monfalcone.
- Tavolare system: ownership is in the land book.
- Population down 3.9% since 2011.
- Seismic zone 3, expected acceleration 0.144 g.
Overview
San Pier d'Isonzo is a municipality in the province of Gorizia, in Friuli-Venezia Giulia. At the end of 2023 it had 1,940 residents, ranked 13 of 25 municipalities in the province.
Earthquakes
For Italy's Civil Protection Department, San Pier d'Isonzo is in seismic zone 3, a zone where strong earthquakes are possible but rare. Most municipalities in the province (15 of 25) are in the same zone.
In the built-up area, the expected ground shaking (peak ground acceleration, PGA) is about 0.144 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 3.9%. The estimated average age is 49 years, in line with the province. 27% of residents are over 65 (the regional figure is 27%). Foreign residents make up 4.9% of the population. On average, a household has 2.2 members.
Income and climate
In tax year 2024, taxpayers in San Pier d'Isonzo declared an average taxable income of 25,062 euros, in line with the province (24,418 euros). The Italian average is 24,895 euros.
San Pier d'Isonzo is in climate zone E, with 2,268 heating degree days: heating may be switched on from 15 October to 15 April, for up to 14 hours a day. The same table puts the town hall at 18 metres above sea level.
Services
In the official Ministry of Education and Ministry of Health lists, San Pier d'Isonzo has 2 schools and 1 pharmacy. The Overture Maps data also lists 1 grocery shop and 5 sports facilities.
The data shows no healthcare facilities within the municipality, against a provincial average of 0.7 per 1,000 residents.
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 13.9% of the land in San Pier d'Isonzo, compared with 13.0% in the province and 8.1% in the region. In 2024 built-up land stayed almost the same.
Radon and contaminated sites
San Pier d'Isonzo is not among the radon priority areas designated by the Regione Friuli Venezia Giulia in 2024. 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 contaminated sites in San Pier d'Isonzo.
Landslides and flooding
Landslide and flood hazard changes from one street to the next even within San Pier d'Isonzo: 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
San Pier d'Isonzo uses the tavolare (land book) system, but the Revenue Agency still publishes the maps: the report finds the building's parcel, that is its sheet and parcel number, starting from the address.
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 16 inhabited census areas in San Pier d'Isonzo. Half of the residents live in areas scoring 59 or more.
Residents by band
- modest 3.0%
- fair 66.7%
- good 30.4%
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.
- 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 Friuli Venezia Giulia, national list compiled by ARPA Lombardia. Licence Atto pubblico (art. 5 L. 633/1941), 2024.
- Contaminated sites, ISPRA, MOSAICO - Banca dati nazionale dei siti oggetto di procedimento di bonifica. Licence CC BY 4.0, updated to 12 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 031021. The text on this page is generated automatically from the data.