TR9 6AG - Flood, Heat, Air & Subsidence Risk - St Columb Major (TR9)

Cornwall, St Columb Major (TR9)

Climate risk summary for TR9 6AG

TR9 6AG in St Columb Major (TR9) has a Medium flood risk - EA NaFRA2 data records 7 properties in a flood risk zone. Heat risk is Lower, with a median (50th percentile) of 9 days above 25°C per year, averaged over the 2021-2040 period under the RCP8.5 high emissions scenario (Met Office UKCP18). Air quality is Low at PM2.5 5.1 μg/m³, above the WHO annual guideline of 5 μg/m³ (Defra UK-AIR). Ground conditions are Low risk, with Weakly Metamorphic Rocks And Sandstone geology; shrink-swell risk is classed as improbable (BGS GeoClimate).

• Flood: EA NaFRA2: 4 medium, 3 low flood risk properties in this postcode.
• Heat: Projected 9 days above 25°C per year, 2021-2040 average (Met Office UKCP18, 50th percentile under RCP8.5, 12 km grid - postcodes within the same grid cell share this value).
• Air quality: PM2.5 5.1 µg/m³ - above the WHO annual guideline of 5 µg/m³ (Defra UK-AIR PCM model, council-level average - every postcode in this council shows this value).
• Ground: BGS data: Weakly Metamorphic Rocks And Sandstone geology. Shrink-swell risk classed as improbable (British Geological Survey).
• Green space: 82% of households here have accessible green space within a 15-minute walk (the government's Environmental Improvement Plan standard), and 27% have a park or green space within a 200m walk of their door - above the England median (Defra, 2025).

What is the flood risk in TR9 6AG?

Flood risk at TR9 6AG is rated Medium, based on Environment Agency NaFRA2 modelling.

Environment Agency flood zone data places TR9 6AG in the medium flood risk band. EA NaFRA2 data shows 4 at medium risk, 3 at low risk in this postcode. The band reflects the highest flood risk within the postcode; some properties within this postcode may face little or no direct flood risk. Individual properties within TR9 6AG can differ - a formal flood risk search is recommended before any property transaction.

How is the air quality in TR9 6AG?

Air quality at TR9 6AG is rated Low, based on Defra UK-AIR annual mean PM2.5 data. Fine particulate matter (PM2.5) comes primarily from road traffic, industry, and domestic burning. Long-term exposure above the WHO guideline of 5 µg/m³ is linked to respiratory and cardiovascular health risks. Buyers and renters in higher air quality risk areas may wish to consider whether the property is near busy roads or industrial sources.

Is subsidence a risk at TR9 6AG?

British Geological Survey data classes the underlying soil at TR9 6AG as Weakly Metamorphic Rocks And Sandstone, with shrink-swell hazard rated improbable (subsidence risk band: Low). A structural survey is the reliable way to assess ground conditions for a specific property.

Where does this data come from?

This LocalRisk report for TR9 6AG draws on four official UK open data sources: Environment Agency NaFRA2 flood modelling, Met Office UKCP18 climate projections, Defra UK-AIR PM2.5 monitoring, and British Geological Survey GeoClimate subsidence mapping. Risk ratings are a screening tool, complementing - not replacing - the searches and surveys ordered as part of a property transaction. Data covers Cornwall and is updated as new official datasets are published.

About the Cornwall area

Cornwall has an exposed coastal and rural setting with upland moors and river valleys and experiences cool, wet winters and mild summers, shaped by Atlantic influences and varied topography.

What should buyers and renters check in TR9 6AG?

Practical check: EA data flags 7 properties at flood risk here - check whether the property is among them by comparing its position to the flood zone boundary. These are postcode-level indicators - conditions vary between individual properties.