Cornwall, Marazion
TR17 0AP in Marazion has a Medium flood risk - EA NaFRA2 data records 1 property 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 Quaternary Marine/Estuarine Sand geology; shrink-swell risk is classed as improbable (BGS GeoSure).
National comparison
Flood risk at TR17 0AP is rated Medium, based on Environment Agency NaFRA2 modelling.
Air quality at TR17 0AP 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.
BGS GeoSure data classes the underlying soil at TR17 0AP as Quaternary Marine/Estuarine Sand, with shrink-swell hazard rated improbable (subsidence risk band: Low). Soil type and shrink-swell behaviour drive subsidence claims following dry summers; recent ABI data shows insurer payouts rose sharply after the 2022 and 2025 hot summers. A structural survey is the reliable way to assess ground risk for a specific property.
The nearest projected coastal erosion zone to TR17 0AP is 57 m away (Erosion projected by 2055 (no climate change uplift) - SMP policy: Hold The Line mapping) and the postcode is in the very high coastal erosion risk band. Coastal erosion risk varies along the shoreline depending on local geology, sea defences and Shoreline Management Plan policy. For properties near the coast, a specialist coastal erosion risk assessment is recommended.
This LocalRisk report for TR17 0AP 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 GeoSure 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.
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.
Environment Agency flood zone data places TR17 0AP in the medium flood risk band. EA NaFRA2 data shows 1 at medium 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 TR17 0AP can differ - a formal flood risk search is recommended before any property transaction.
Practical check: EA flags 1 property at flood risk here, near the coast - compare the floor level to the highest recorded tide line and check for flood resilience measures. The nearest projected erosion zone is 57m away - check the Shoreline Management Plan policy for this stretch and whether the property is within 100 years of the erosion line. These are postcode-level indicators - conditions vary between individual properties.