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Colliano: what to know before buying a home

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

Liveability index free for any address

Search for an address in Colliano

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: Contrada Monte di Pruno 1, Colliano.

Colliano, on the slopes of the upper Sele valley

Colliano sits on the slopes of the upper Sele valley, in the interior of the province of Salerno near the border with Irpinia, with its centre at around 600 metres and land that runs down to the valley floor. It is mountain and hill country, with woods, pasture and olive groves, far from the cities: Salerno and the coast can only be reached by car, and the journey times need factoring in.

The first thing to know is the seismic picture. Colliano is in seismic zone 1, the highest on the Civil Protection Department's scale, with an expected ground acceleration of about 0.228 g, and it lies in the area worst hit by the 1980 earthquake. Many buildings were rebuilt or repaired in the years that followed. For buyers, what counts is when and how the building was put up: ask for the structural design, the sign-off inspection and any later work, and have a surveyor read them.

There were 3,405 residents in 2023, down 9.5% since 2011, or 359 fewer people, according to Istat, the national statistics office. The average age is 45.0, practically the same as 45.2 for the province of Salerno, and over-65s make up 22.8%. Foreign nationals are 1.5%. Average incomes are well below the provincial average.

The climate is zone E, with cold winters at this height, and insulation has a direct effect on heating bills.

For landslides and flooding, the report looks up the official maps for the exact location of the house. Cadastral maps from the Revenue Agency are available.

Key points

  • Slopes of the upper Sele valley, bordering Irpinia.
  • Seismic zone 1, expected acceleration about 0.228 g.
  • Homes rebuilt after 1980: ask for the design and inspection.
  • 3,405 residents in 2023, down 9.5%.

Overview

Colliano is a municipality in the province of Salerno, in Campania. At the end of 2023 it had 3,405 residents, ranked 60 of 158 municipalities in the province.

Earthquakes

For Italy's Civil Protection Department, Colliano is in seismic zone 1, the highest-risk zone, where very strong earthquakes are possible. Only 18 of 158 municipalities in the province are in zone 1.

In the built-up area, the expected ground shaking (peak ground acceleration, PGA) is about 0.228 g, a medium-high value: the level with a 10% probability of being exceeded in 50 years, on rock.

For anyone buying in Colliano, 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 9.5%. The estimated average age is 45 years, in line with the province. 23% of residents are over 65 (the regional figure is 21%). Foreign residents make up 1.5% of the population. On average, a household has 2.3 members.

Income and climate

In tax year 2024, taxpayers in Colliano declared an average taxable income of 15,511 euros, below the provincial average (19,912 euros). The Italian average is 24,895 euros.

Colliano is in climate zone E, with 2,102 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 630 metres above sea level.

Services

In the official Ministry of Education and Ministry of Health lists, Colliano has 6 schools and 2 pharmacies. The Overture Maps data also lists 3 grocery shops and supermarkets, 2 healthcare facilities and 1 green area.

There are 0.6 pharmacies per 1,000 residents, more than the province average (0.4).

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 5.6% of the land in Colliano, compared with 8.0% in the province and 10.6% in the region. In 2024 built-up land grew by 0.6 hectares.

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 Colliano; one has been cleaned up or closed.

Landslides and flooding

Landslide and flood hazard changes from one street to the next even within Colliano: 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 Colliano 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 44 inhabited census areas in Colliano. Half of the residents live in areas scoring 50 or more.

Residents by band

  • modest 43.3%
  • fair 56.7%

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 065043. The text on this page is generated automatically from the data.