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Siliqua: what to know before buying a home

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

Liveability index free for any address

Search for an address in Siliqua

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: Corso Repubblica 1, Siliqua.

Siliqua, the Cixerri valley and Acquafredda castle

On the road between Cagliari and Iglesias, in the Cixerri valley, Siliqua can be spotted from a distance by the volcanic hill topped with the ruins of Acquafredda castle, linked to the figure of Ugolino della Gherardesca. The town lies low on the plain, surrounded by fields, pastures and low hills. The SS130 main road and the railway to Iglesias, with a station at Siliqua, connect it with the Cagliari area.

Being close to Sardinia's capital is the main point for buyers. Traditional Campidano houses, on one or two floors around an inner courtyard with walls of ladiri, bricks of mud and straw, stand alongside newer concrete homes. In old earth-built houses, damp and the condition of the walls need careful checking. The town has 5 supermarkets, 3 school sites and 1 pharmacy; for the hospital and bigger services people go towards Cagliari.

Siliqua is losing people steadily. Istat, the national statistics office, counted 3,529 residents in 2023, down 11.7% since 2011. The average age is 49.7 against 48.1 for the province, and over-65s make up 29.4%, against 25.7% provincially. Foreign residents are very few, 1.6%. Average declared incomes are in line with the province.

Earthquakes are not an issue. All 70 municipalities in the province are in seismic zone 4, the lowest on the Civil Protection Department scale (the national emergency agency), with an expected acceleration of about 0.050 g. Heat matters more: this is climate zone C, with long summers, so the orientation of the house and roof insulation make a real difference.

The Revenue Agency (Agenzia delle Entrate) publishes the cadastral maps and the report finds the plot. The Cixerri and the valley's streams can overflow in heavy rain, and the flood maps are read for the address.

Key points

  • Cixerri valley, with Acquafredda castle on its volcanic hill.
  • SS130 and the Iglesias railway towards the Cagliari area.
  • 3,529 residents in 2023, down 11.7% since 2011.
  • All 70 municipalities in the province in seismic zone 4.

Overview

Siliqua is a municipality in the province of Cagliari, in Sardegna. At the end of 2023 it had 3,529 residents, ranked 27 of 70 municipalities in the province.

Earthquakes

For Italy's Civil Protection Department, Siliqua is in seismic zone 4, the lowest-risk zone, where strong earthquakes are very rare. All 70 municipalities in the province are in the same zone.

In the built-up area, the expected ground shaking (peak ground acceleration, PGA) is about 0.050 g, a moderate value: the level with a 10% probability of being exceeded in 50 years, on rock.

In zone 4 the risk is low, but for an older building it is still worth asking about the state of the structure.

Population

Compared with the 2011 census, the resident population has fallen by 11.7%. The estimated average age is 50 years, higher than the province average (48). 29% of residents are over 65 (the regional figure is 27%). Foreign residents make up 1.6% of the population. On average, a household has 2.3 members.

Income and climate

In tax year 2024, taxpayers in Siliqua declared an average taxable income of 19,201 euros, in line with the province (19,085 euros). The Italian average is 24,895 euros.

Siliqua is in climate zone C, with 1,030 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 66 metres above sea level.

Services

In the official Ministry of Education and Ministry of Health lists, Siliqua has 3 schools and 1 pharmacy. The Overture Maps data also lists 5 grocery shops and supermarkets, 1 healthcare facility and 1 sports facility.

There are 0.3 healthcare facilities per 1,000 residents, fewer than the province average (0.9).

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 1.5% of the land in Siliqua, compared with 3.4% in the region. In 2024 built-up land stayed almost the same.

Radon and contaminated sites

Siliqua is not among the radon priority areas designated by the Regione Sardegna in 2022. Radon varies from building to building and can only be known by measuring it, especially on ground floors and in basements.

Landslides and flooding

Landslide and flood hazard changes from one street to the next even within Siliqua: 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 Siliqua 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 Siliqua. Half of the residents live in areas scoring 71 or more.

Residents by band

  • fair 3.3%
  • good 79.8%
  • very good 16.9%

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 118056. The text on this page is generated automatically from the data.