NP18 1HS - Flood, Heat, Air & Subsidence Risk - Usk

Monmouthshire, Usk

Climate risk summary for NP18 1HS

NP18 1HS in Usk has a Very low flood risk. Heat risk is Lower, with a median (50th percentile) of 24 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 5.4 μg/m³, above the WHO annual guideline of 5 μg/m³ (Defra UK-AIR). Ground conditions are Low risk, with Mudstone And Sandstone geology; shrink-swell risk is classed as improbable (BGS GeoClimate).

• Flood: Flood risk is minimal in this area.
• Heat: Projected 24 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 5.4 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: Mudstone And Sandstone geology. Shrink-swell risk classed as improbable (British Geological Survey).

What is the flood risk in NP18 1HS?

Flood risk at NP18 1HS is rated Very Low, based on Natural Resources Wales flood mapping.

Natural Resources Wales flood zone data shows very low flood risk for NP18 1HS in Usk. 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 NP18 1HS?

Air quality at NP18 1HS 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 NP18 1HS?

British Geological Survey data classes the underlying soil at NP18 1HS as Mudstone 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 NP18 1HS 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 Monmouthshire and is updated as new official datasets are published.

About the Monmouthshire area

Monmouthshire has a predominantly rural setting with river valleys, rolling hills and market towns along the England - Wales border and experiences cool, wet winters and mild summers, influenced by Atlantic weather and varied topography.

What should buyers and renters check in NP18 1HS?

Practical check: With 24 hot days projected (UKCP18 50th percentile, 2021-2040 average under RCP8.5), note which bedrooms face west (hottest in evening) and whether windows allow through-ventilation. These are postcode-level indicators - conditions vary between individual properties.

Climate risk can change street by street, so it is worth checking neighbouring postcodes too. The full risk report for NP18 1AA is at localrisk.co.uk/postcode/NP181AA, and you can compare NP18 1HS side by side with any UK postcode at localrisk.co.uk/compare.