What is the radon risk in Cornwall?

Cornwall has an average radon risk of Very High across 12 postcode districts, based on BGS indicative atlas data. 10 districts are classified High risk or above, where UKHSA recommends testing all homes.

Which postcode areas in Cornwall have the highest radon levels?

The postcode districts with the highest radon risk in Cornwall are listed in the table on this page, sorted from highest to lowest risk classification. Use the postcode lookup at radon.tips to check any specific district.

Do I need a radon test in Cornwall?

Testing is strongly recommended for homes in High risk or above districts in Cornwall. Even in Moderate risk areas, a 90-day postal test costing around £29 provides peace of mind.

Radon Risk in Cornwall

Last reviewed: March 2026 · Data: BGS Indicative Atlas v3.

12 postcode districts · 10 classified High or above · Average risk class: 4.2 / 5

Radon is a naturally occurring radioactive gas and the second largest cause of lung cancer in the UK. Risk varies significantly by location — the areas below show how Cornwall compares. 10 districts in Cornwall are classified High risk or above — testing is strongly recommended in these areas.

All Districts in Cornwall

District	Risk Level	% Homes

Get a Radon Test for Cornwall

The only way to know your home's radon level is to test. Radon levels in Cornwall are classified as Very High — a test takes 3 months and costs around £29.

UKRadon Postal Test Kit
From ~£29 · 3-month detector Airthings Corentium Home (Amazon UK)
~£99 · Digital · Ongoing monitoring

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