LL11 3AP - Flood, Heat, Air & Subsidence Risk - St Asaph

Denbighshire, St Asaph

Climate risk summary for LL11 3AP

LL11 3AP in St Asaph has a Very low flood risk. Heat risk is Lower, with a median (50th percentile) of 10 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 4.9 μg/m³, within the WHO annual guideline of 5 μg/m³ (Defra UK-AIR). Ground conditions are Low risk, with Calcareous Rocks And Mudstone geology; shrink-swell risk is classed as improbable (BGS GeoClimate).

• Flood: Flood risk is minimal in this area.
• Heat: Projected 10 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 4.9 µg/m³ - within 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: Calcareous Rocks And Mudstone geology. Shrink-swell risk classed as improbable (British Geological Survey).

What is the flood risk in LL11 3AP?

Flood risk at LL11 3AP is rated Very Low, based on Natural Resources Wales flood mapping.

Natural Resources Wales flood zone data shows very low flood risk for LL11 3AP in St Asaph. 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 LL11 3AP?

Air quality at LL11 3AP 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 LL11 3AP?

British Geological Survey data classes the underlying soil at LL11 3AP as Calcareous Rocks And Mudstone, 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 LL11 3AP draws on four official UK open data sources: Natural Resources Wales flood mapping, 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 Denbighshire and is updated as new official datasets are published.

About the Denbighshire area

Denbighshire spans upland hills, river valleys and market towns and experiences cool, wet winters and mild summers, shaped by elevation and Atlantic-influenced weather.

Climate risk can change street by street, so it is worth checking neighbouring postcodes too. The full risk report for LL11 0EW is at localrisk.co.uk/postcode/LL110EW, and you can compare LL11 3AP side by side with any UK postcode at localrisk.co.uk/compare.