Monte San Biagio: what to know before buying a home
A municipality in the province of Latina, Lazio. Official data on earthquakes, population, services and transport.
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Search for an address in Monte San Biagio
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 di Mezzo 2, Monte San Biagio.
Monte San Biagio, above the Fondi plain on the Via Appia
The old village of Monte San Biagio stands on a spur of the Ausoni mountains above the plain of Fondi and its coastal lake, between Terracina and Fondi in southern Lazio. Below it runs the ancient Via Appia, squeezed between mountain and plain, which takes you to either town in a few minutes.
The municipality has two distinct parts. Up the hill is the old centre, with stone houses packed together and lanes where a car barely fits; down below are the newer areas along the Appia and towards the farmed plain. The beaches of Terracina and Sperlonga are close, so part of the demand is for holiday homes. For work people look to Fondi, with its large wholesale fruit and vegetable market, to Latina and to Rome, reachable by train from Fondi station on the Rome to Naples line via Formia. Locally the town is also known for its sausage.
Istat, the national statistics office, counted 6,042 residents in 2023, down 1.7% since 2011. Average age is 46.0 against 45.5 in the province, over-65s are 24.7% (provincial figure 22.8%) and foreign nationals 6.9%. Declared incomes are below the provincial average.
On earthquakes, Monte San Biagio is in seismic zone 3 of the Civil Protection Department classification, like 29 other municipalities in the province of Latina, with expected ground acceleration of about 0.082 g, a moderate to low figure. In the stone houses of the old village, the state of the roof, the ties between walls and floors, and damp are what matter most.
On the rocky slope above the village falling rocks are a consideration, while down on the plain, between drainage canals and the lake, some areas can flood; the report checks both for the address. Cadastral maps are published by the Revenue Agency (Agenzia delle Entrate).
Key points
- Old village in the Ausoni mountains, newer homes along the Appia.
- Between Terracina and Fondi, a few kilometres from the sea.
- 6,042 residents in 2023, down 1.7% since 2011.
- Seismic zone 3, expected ground acceleration about 0.082 g.
Overview
Monte San Biagio is a municipality in the province of Latina, in Lazio. At the end of 2023 it had 6,042 residents, ranked 19 of 33 municipalities in the province.
Earthquakes
For Italy's Civil Protection Department, Monte San Biagio is in seismic zone 3, a zone where strong earthquakes are possible but rare. The region uses a finer breakdown: here the classification is 3B. Most municipalities in the province (30 of 33) are in the same zone.
In the built-up area, the expected ground shaking (peak ground acceleration, PGA) is about 0.082 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 1.7%. The estimated average age is 46 years, in line with the province. 25% of residents are over 65 (the regional figure is 23%). Foreign residents make up 6.9% of the population. On average, a household has 2.3 members.
Income and climate
In tax year 2024, taxpayers in Monte San Biagio declared an average taxable income of 17,985 euros, below the provincial average (21,502 euros). The Italian average is 24,895 euros.
Monte San Biagio is in climate zone C, with 1,319 heating degree days: heating may be switched on from 15 November to 31 March, for up to 10 hours a day. The same table puts the town hall at 133 metres above sea level.
Services
In the official Ministry of Education and Ministry of Health lists, Monte San Biagio has 5 schools and 2 pharmacies. The Overture Maps data also lists 2 grocery shops and supermarkets, 1 healthcare facility and 3 parks and green areas.
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 4.5% of the land in Monte San Biagio, compared with 10.1% in the province and 8.2% in the region. In 2024 built-up land stayed almost the same.
Radon and contaminated sites
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 one contaminated site, or site still under investigation, in Monte San Biagio. The report tells you whether one is close to the address.
Landslides and flooding
Landslide and flood hazard changes from one street to the next even within Monte San Biagio: 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 Monte San Biagio 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 57 inhabited census areas in Monte San Biagio. Half of the residents live in areas scoring 68 or more.
Residents by band
- fair 30.4%
- good 58.6%
- very good 11.1%
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.
- 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 059015. The text on this page is generated automatically from the data.