LL28 4AD - Flood, Heat, Air & Subsidence Risk - Mochdre

Conwy, Mochdre

LL28 4AD in Mochdre has a Very low flood risk. Heat risk is Lower, with a median (50th percentile) of 8 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 4.7 μg/m³, within the WHO annual guideline of 5 μg/m³ (Defra UK-AIR). Ground conditions are Low risk, with Glacial Till geology; shrink-swell risk is classed as improbable (BGS GeoSure).

• Flood: Flood risk is minimal in this area.
• Heat: Projected 8 days above 25°C per year, 2021-2040 average (Met Office UKCP18, 50th percentile under RCP8.5).
• Air quality: PM2.5 4.7 µg/m³ - within the WHO annual guideline of 5 µg/m³ (Defra UK-AIR).
• Ground: BGS data: Glacial Till geology. Shrink-swell risk classed as improbable (British Geological Survey).

Flood risk at LL28 4AD is rated Very Low, based on Natural Resources Wales flood mapping.

Air quality at LL28 4AD 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 LL28 4AD as Glacial Till, 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.

This LocalRisk report for LL28 4AD 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 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 Conwy and is updated as new official datasets are published.

Conwy has a mixed coastal and upland setting spanning river valleys, mountains and seaside towns and experiences cool, wet winters and mild summers, influenced by Atlantic weather and steep catchments.

Natural Resources Wales flood zone data shows very low flood risk for LL28 4AD in Mochdre. 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.