Skip to content
Vicinalia
Italiano Sign up

San Gemini: what to know before buying a home

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

Liveability index free for any address

Search for an address in San Gemini

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: Localita' Osteria 1, San Gemini.

San Gemini, a walled town with mineral springs near Terni

Mineral water has made San Gemini known across Italy: the San Gemini and Fabia springs rise within its boundaries. The centre is a walled village on a hill at around 340 metres, along the route of the ancient Via Flaminia, and a few kilometres away lie the remains of the Roman town of Carsulae. Terni is about fifteen minutes away, Narni a little further.

San Gemini offers buyers two kinds of home. Inside the walls there are stone houses, often restored, with narrow lanes and parking outside the gates; around them, in the countryside and newer areas, detached houses and homes with gardens. Being close to Terni lets you work in the city and live in a quieter town, and the E45 dual carriageway towards Perugia passes nearby.

There are 4,690 residents (2023), down 4.7% on 2011. The average age is 48.6, slightly below the province of Terni (48.9), and over-65s make up 27.9%. Foreign residents account for 3.5%. Average declared incomes are above the provincial average.

San Gemini is in seismic zone 2, like 11 other municipalities in the province, with an expected ground acceleration of about 0.160 g. Umbria has a long history of earthquakes, so for stone houses in the old town ask whether seismic improvement work has been carried out and under which permits. The report adds landslide and flood maps for the address.

Key points

  • Walled town on the Via Flaminia, with the San Gemini and Fabia springs.
  • About fifteen minutes from Terni, near Carsulae.
  • 4,690 residents, down 4.7% since 2011.
  • Seismic zone 2, expected acceleration about 0.160 g.

Overview

San Gemini is a municipality in the province of Terni, in Umbria. At the end of 2023 it had 4,690 residents, ranked 6 of 33 municipalities in the province.

Earthquakes

For Italy's Civil Protection Department, San Gemini is in seismic zone 2, a zone where strong earthquakes are possible. Only 12 of 33 municipalities in the province are in zone 2.

In the built-up area, the expected ground shaking (peak ground acceleration, PGA) is about 0.160 g, a medium-high value: the level with a 10% probability of being exceeded in 50 years, on rock.

For anyone buying in San Gemini, the building matters a great deal: ask for the design year, whether it met the 2008 seismic standards, and whether any seismic retrofit has been carried out.

Population

Compared with the 2011 census, the resident population has fallen by 4.7%. The estimated average age is 49 years, in line with the province. 28% of residents are over 65 (the regional figure is 27%). Foreign residents make up 3.5% of the population. On average, a household has 2.3 members.

Income and climate

In tax year 2024, taxpayers in San Gemini declared an average taxable income of 25,390 euros, above the provincial average (23,539 euros). The Italian average is 24,895 euros.

San Gemini is in climate zone D, with 1,978 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 337 metres above sea level.

Services

In the official Ministry of Education and Ministry of Health lists, San Gemini has 4 schools and 1 pharmacy. The Overture Maps data also lists 2 grocery shops and supermarkets, 1 healthcare facility, 4 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 8.3% of the land in San Gemini, compared with 4.7% in the province and 5.3% 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 low. 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 San Gemini; one has been cleaned up or closed.

Landslides and flooding

Landslide and flood hazard changes from one street to the next even within San Gemini: 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 San Gemini 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 27 inhabited census areas in San Gemini. Half of the residents live in areas scoring 65 or more.

Residents by band

  • modest 0.2%
  • fair 32.5%
  • good 53.8%
  • very good 13.4%

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

ISTAT code 055029. The text on this page is generated automatically from the data.