Rhondda Cynon Taf, Treherbert
CF42 5AA in Treherbert has a High flood risk. Heat risk is Lower, with a median (50th percentile) of 15 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 5.2 μg/m³, above 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 risk at CF42 5AA is rated High, based on Natural Resources Wales flood mapping.
Natural Resources Wales flood zone data places CF42 5AA in the high flood risk band. 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.
Air quality at CF42 5AA 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 CF42 5AA 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 CF42 5AA 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 Rhondda Cynon Taf and is updated as new official datasets are published.
Rhondda Cynon Taf has a predominantly upland valley setting with steep-sided former coalfield communities and experiences cool, wet winters and mild summers, shaped by elevation and Atlantic rainfall.
Climate risk can change street by street, so it is worth checking neighbouring postcodes too. The full risk report for CF42 5AB is at localrisk.co.uk/postcode/CF425AB, and you can compare CF42 5AA side by side with any UK postcode at localrisk.co.uk/compare.