Data Sources
We use publicly available geographic and preparedness data.
Explore mapped source coverage or compare postcode datasets.
- Active↗
Postcodes.io
UK postcode coordinates and administrative geography
- Active↗
UK Government Be Ready
Household preparedness guidance
- Active↗
Environment Agency
River and sea flood planning zones for England
- Active↗
Environment Agency live flood alerts
Active flood alerts and warnings near the postcode point in England
- Active↗
Met Office
Current regional and UK severe-weather warning feeds
- Configured↗
OpenFreeMap / MapLibre
OpenStreetMap basemap rendered by MapLibre
- Active↗
ONS Census 2021 / Nomis
Census 2021 usual residents by LSOA, England and Wales
- Active↗
Open Topo Data / Copernicus EU-DEM
Modelled elevation at the postcode point
- Active↗
Department for Transport NaPTAN
Nearby National Rail station access points in Great Britain
- Active↗
NESO
Approximate electricity distribution licence areas in Great Britain
- Active↗
Ofwat / Stream
Indicative water company boundaries in England and Wales
Postcode data is supplied by Postcodes.io. The production checker covers Great Britain. Contains Ordnance Survey, Royal Mail, National Statistics and NRS data © copyright and database right 2025. Postcode data licences.