Radon in Devon: Risk, Testing & What to Do
Devon has an average radon risk classification of Very High, based on BGS indicative atlas data covering 46 postcode districts. 31 of these districts are classified as High risk or above. Radon testing is recommended for all homes in areas with a High or above classification.
Why is Radon a Risk in Devon?
Devon is underlain by Carboniferous granite and uranium-bearing Devonian sedimentary rocks, which naturally release radon gas as they decay. The Dartmoor granite in particular is one of the highest radon-producing geological formations in England.
Highest-Risk Districts in Devon
All districts sorted by risk class (highest first). Click a district for detailed information.
| District | Risk Level | % Homes at Risk |
|---|---|---|
| EX20 | Highest | >30% |
| EX35 | Highest | >30% |
| PL16 | Highest | >30% |
| PL19 | Highest | >30% |
| PL20 | Highest | >30% |
| PL21 | Highest | >30% |
| TQ10 | Highest | >30% |
| TQ13 | Highest | >30% |
| TQ8 | Highest | >30% |
| EX18 | Highest | 10–30% |
| EX19 | Highest | 10–30% |
| EX21 | Highest | 10–30% |
| EX31 | Highest | 10–30% |
| PL8 | Highest | 10–30% |
| TQ11 | Highest | 10–30% |
| TQ6 | Highest | 10–30% |
| TQ7 | Highest | 10–30% |
| TQ9 | Highest | 10–30% |
| EX16 | Very High | 5–10% |
| EX32 | Very High | 5–10% |
| EX33 | Very High | 5–10% |
| EX34 | Very High | 5–10% |
| EX36 | Very High | 5–10% |
| EX37 | Very High | 5–10% |
| EX38 | Very High | 5–10% |
| EX39 | Very High | 5–10% |
| TQ12 | Very High | 5–10% |
| EX1 | High | 3–5% |
| EX13 | High | 3–5% |
| EX22 | High | 3–5% |
| EX6 | High | 3–5% |
| EX10 | Moderate | 1–3% |
| EX17 | Moderate | 1–3% |
| EX2 | Moderate | 1–3% |
| EX7 | Moderate | 1–3% |
| TQ14 | Moderate | 1–3% |
| EX11 | Low | <1% |
| EX12 | Low | <1% |
| EX14 | Low | <1% |
| EX15 | Low | <1% |
| EX24 | Low | <1% |
| EX3 | Low | <1% |
| EX4 | Low | <1% |
| EX5 | Low | <1% |
| EX8 | Low | <1% |
| EX9 | Low | <1% |
Get a Radon Test for Devon
The only way to know your home's radon level is to test. Radon levels in Devon are classified as Very High — a test takes 3 months and costs around £29.
From ~£29 · 3-month detector Airthings Corentium Home
~£99 · Digital · Ongoing monitoring
We may earn a small commission from these links at no extra cost to you.
Check Your Postcode
Enter your postcode to see the exact radon risk for your specific area within Devon.