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Onano: what to know before buying a home

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

Liveability index free for any address

Search for an address in Onano

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 Firenze 1, Onano.

Onano, lentil country in the Alta Tuscia

The Onano lentil, small and full of flavour, is what made the village known, and the countryside around it is still farmed on volcanic soils. Onano is in the Alta Tuscia, the northern tip of the province of Viterbo, on high ground at around 500 metres, towards the border with Tuscany, with Lake Bolsena not far away. For larger services people look to Acquapendente and Viterbo.

The historic centre has masonry houses on several levels, often with cellars dug into tuff, the local volcanic stone, and sloping streets. Buyers in the village should check damp, the state of the cellars and access; anyone looking for a farmhouse in the countryside, the access road, water and utility connections. The climate is zone E, with cold winters for the altitude.

The population is shrinking and ageing: 890 residents in 2023, 12.5% fewer than in 2011 according to Istat, the national statistics institute. The estimated average age is 51.9 against 47.5 in the province, and over-65s are 34.7%, well above the provincial 25.9%. Households average 1.99 people and foreign residents are 4.6%. Declared incomes are below the provincial average.

The Civil Protection department places Onano in seismic zone 2, like 40 of the 60 municipalities in the province, with an expected ground acceleration of about 0.141 g. In tuff houses in the centre, have the walls and floors checked, especially if storeys were added or walls cut through in the past.

Landslide hazard on the slopes and at the edges of the village varies from spot to spot, and the report checks it on the official maps for the address. The Revenue Agency publishes the cadastral maps.

Key points

  • Alta Tuscia, on volcanic ground at about 500 metres.
  • Home of the Onano lentil.
  • Over-65s at 34.7%, against 25.9% in the province.
  • Seismic zone 2, expected acceleration about 0.141 g.

Overview

Onano is a municipality in the province of Viterbo, in Lazio. At the end of 2023 it had 890 residents, among the smallest in the province (55 of 60).

Earthquakes

For Italy's Civil Protection Department, Onano 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 (40 of 60) 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.

For anyone buying in Onano, 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 12.5%. The estimated average age is 52 years, higher than the province average (48). 35% of residents are over 65 (the regional figure is 23%). Foreign residents make up 4.6% of the population. On average, a household has 2.0 members.

Income and climate

In tax year 2024, taxpayers in Onano declared an average taxable income of 17,364 euros, below the provincial average (22,031 euros). The Italian average is 24,895 euros.

Onano is in climate zone E, with 2,325 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 510 metres above sea level.

Services

In the official Ministry of Education and Ministry of Health lists, Onano has 1 pharmacy.

The data shows no schools within the municipality, against a provincial average of 0.9 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 3.3% of the land in Onano, compared with 4.7% 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 Onano, 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 Onano: 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 Onano 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 11 inhabited census areas in Onano. Half of the residents live in areas scoring 68 or more.

Residents by band

  • fair 18.1%
  • good 81.9%

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 056040. The text on this page is generated automatically from the data.