Isle of Wight, Swanmore
PO33 1JD in Swanmore has a High flood risk - EA NaFRA2 data records 28 properties at high flood risk. Heat risk is Lower, with a median (50th percentile) of 17 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 5.6 μg/m³, above the WHO annual guideline of 5 μg/m³ (Defra UK-AIR). Ground conditions are High risk, with Claystone/Mudstone geology; shrink-swell risk is classed as probable (BGS GeoSure).
National comparison
Flood risk at PO33 1JD is rated High, based on Environment Agency NaFRA2 modelling.
Air quality at PO33 1JD 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 PO33 1JD as Claystone/Mudstone, with shrink-swell hazard rated probable (subsidence risk band: High). 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 PO33 1JD is 125 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 PO33 1JD 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 Isle of Wight and is updated as new official datasets are published.
The Isle of Wight has a varied coastal and rural setting with river valleys, cliffs and low-lying plains and experiences cool, wet winters and warm summers, influenced by English Channel conditions and varied topography.
Environment Agency flood zone data places PO33 1JD in the high flood risk band. EA NaFRA2 data shows 28 at high risk, 3 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. A formal flood risk search and review of buildings insurance availability is recommended before any property transaction in this area.
Practical check: EA flags 34 properties at flood risk here, near the coast - compare the floor level to the highest recorded tide line and check for flood resilience measures. With claystone/mudstone geology here, look for signs of ground movement - diagonal cracks above windows, sticking doors, and gaps between walls and extensions. The nearest projected erosion zone is 125m 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.