River flooding is the most common cause of property damage in Europe. It can make a home uninsurable and wipe thousands off its value. FloodMap shows the live level of every major river near any address, updated every 5 minutes from official government gauges. Check a show home in seconds. Save properties you're considering and get alerted the moment flood risk rises.
For the formal flood zone boundary survey, also check the official tools:
England and Wales
Use the EA Long Term Flood Risk checker to see if a specific address is within a defined flood zone.
Ireland
The OPW Flood Info portal maps flood zones for Irish properties.
Other countries
Search for your national flood mapping agency or ask your solicitor/surveyor to check flood risk as part of the conveyancing process.
FloodMap gives you real-time flood risk for any address, based on live gauge readings from 454 monitored rivers across 35 countries. For 230 of those rivers, FloodMap maps the terrain along the river corridor using elevation data, showing you how far floodwater could spread at current levels. Risk levels refresh every 5 minutes.
| Normal | River within typical range. No flood concern. |
| Watch | River elevated or rising. Monitor conditions. |
| Warning | River at high levels. Potential flood risk. |
| Severe | Extreme levels. Take immediate precautions. |
| Watch | Monitor conditions. Prepare your property - move valuables upstairs. Check back in 30 minutes. |
| Warning | Flood is possible or expected. Move valuables and vehicles to higher ground. Prepare your emergency kit. Follow local authority guidance. |
| Severe | Extreme flood risk. Be ready to evacuate immediately if instructed. Do not drive through floodwater. Call 999 (UK) or local emergency services if in immediate danger. |
FloodMap shows live river gauge data to help you monitor flood conditions. This is not an official emergency warning service and does not replace a formal flood risk assessment for property purchase. Always follow guidance from your local emergency services and flood authorities.
FloodMap combines multiple data layers to produce a risk score for any address:
1. Live river levels - Current gauge readings from official stations, compared against historical thresholds for each river.
2. Terrain analysis (HAND) - Height Above Nearest Drainage measures vertical distance between your property and the nearest river channel using satellite elevation data.
3. Weather forecast - 72-hour precipitation forecast and soil moisture levels determine how much additional water will reach rivers.
4. Catchment response - Each river's drainage area, terrain steepness, and historical response patterns determine how quickly rainfall translates to rising levels.
5. Seasonal context - Historical flood frequency by month, combined with current soil saturation, indicates baseline risk for the time of year.
All readings come directly from official government monitoring networks:
Plus 20+ additional national networks across 35 countries. No third-party data aggregators.
FloodMap works as a home screen app on any phone. Once installed you get push flood alerts and faster load times.
iPhone / iPad
Open in Safari, tap the Share button at the bottom, then tap "Add to Home Screen".
Android
Open in Chrome, tap the three-dot menu, then tap "Add to Home Screen" or "Install app".
River levels update every 5 minutes. Flood risk is recalculated as levels change. The page refreshes automatically every 5 minutes while open.
Found an issue or have a suggestion? Email hello@floodmap.app or visit floodmap.app.