Trevi nel Lazio: what to know before buying a home
A municipality in the province of Frosinone, Lazio. Official data on earthquakes, population, services and transport.
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Search for an address in Trevi nel Lazio
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 Madonna del Riposo 1, Trevi nel Lazio.
Trevi nel Lazio, the upper Aniene valley in the Simbruini hills
Trevi nel Lazio sits in the upper Aniene valley, in the Simbruini mountains, a wooded upland area that is part of the Monti Simbruini regional park. The village is perched on a spur, with the castle and old centre at the top and several hamlets lower down along the valley. The river, still close to its source here, runs along the valley floor.
Although it belongs to the province of Frosinone, Trevi also looks towards Subiaco and Rome, and many Roman families keep a summer house here. Buyers find stone houses in the historic centre, often needing work, and small villas in the newer areas. At this altitude winters are cold, and insulation and heating weigh on the budget of a house lived in all year round.
Istat, the national statistics office, records 1,720 residents in 2023, down 7.2% on 2011. The average age is 49.9, against 46.8 in the province, and over-65s make up 29.2%. Foreign residents account for 6.5%.
Seismic hazard is high across much of the province: 30 municipalities are in zone 1 and 59 in zone 2. Trevi nel Lazio is in zone 2, with an expected ground acceleration in the built-up area of 0.164 g. For an old masonry house, it is wise to have a surveyor assess the floors, roof and how the walls are bonded together.
The Revenue Agency (Agenzia delle Entrate) publishes the cadastral maps and the report finds the plot from the address. Between the spur, the slopes and the valley floor, landslides, gradient and flooding near the Aniene are checked at the exact point.
Key points
- Mountain village in the upper Aniene valley, inside the Simbruini park.
- Many second homes owned by families from Rome.
- Seismic zone 2, expected acceleration 0.164 g.
- Over-65s at 29.2%, residents down 7.2%.
Overview
Trevi nel Lazio is a municipality in the province of Frosinone, in Lazio. At the end of 2023 it had 1,720 residents, ranked 59 of 91 municipalities in the province.
Earthquakes
For Italy's Civil Protection Department, Trevi nel Lazio is in seismic zone 2, a zone where strong earthquakes are possible. The region uses a finer breakdown: here the classification is 2B. Most municipalities in the province (59 of 91) are in the same zone.
In the built-up area, the expected ground shaking (peak ground acceleration, PGA) is about 0.164 g, a medium-high value: the level with a 10% probability of being exceeded in 50 years, on rock.
For anyone buying in Trevi nel Lazio, 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 7.2%. The estimated average age is 50 years, higher than the province average (47). 29% of residents are over 65 (the regional figure is 23%). Foreign residents make up 6.5% of the population. On average, a household has 2.0 members.
Income and climate
In tax year 2024, taxpayers in Trevi nel Lazio declared an average taxable income of 20,794 euros, in line with the province (21,514 euros). The Italian average is 24,895 euros.
Trevi nel Lazio is in climate zone E, with 2,604 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 821 metres above sea level.
Services
In the official Ministry of Education and Ministry of Health lists, Trevi nel Lazio has 3 schools and 1 pharmacy. The Overture Maps data also lists 5 parks and green areas.
The data shows no grocery shops and supermarkets 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 1.8% of the land in Trevi nel Lazio, compared with 6.9% in the province and 8.2% in the region. In 2024 built-up land grew by 0.5 hectares.
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 Trevi nel Lazio, and one more has been cleaned up or closed. 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 Trevi nel Lazio: 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 Trevi nel Lazio 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 17 inhabited census areas in Trevi nel Lazio. Half of the residents live in areas scoring 69 or more.
Residents by band
- fair 7.2%
- good 92.8%
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 060080. The text on this page is generated automatically from the data.