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

Cornwall, St Columb Major (TR9)

Climate risk summary for TR9 6AL

TR9 6AL in St Columb Major (TR9) has a Very low flood risk - EA NaFRA2 data records no properties in a flood risk zone in this postcode. 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: no properties at flood risk 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 6AL?

Flood risk at TR9 6AL is rated Very Low, based on Environment Agency NaFRA2 modelling.

Environment Agency flood zone data shows very low flood risk for TR9 6AL in St Columb Major (TR9). EA NaFRA2 data shows no properties at flood 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. For a specific property, a conveyancing search will confirm the exact flood zone position.

How is the air quality in TR9 6AL?

Air quality at TR9 6AL 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 6AL?

British Geological Survey data classes the underlying soil at TR9 6AL 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 6AL 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.

Climate risk can change street by street, so it is worth checking neighbouring postcodes too. The full risk report for TR9 6AD is at localrisk.co.uk/postcode/TR96AD, and you can compare TR9 6AL side by side with any UK postcode at localrisk.co.uk/compare.