Dundas Church Bo'ness Road · Photo: Auldcathy · CC BY-SA 4.0More of Grangemouth’s homes are at high or medium flood risk than in 97% of Scottish towns: 13%, from rivers or the sea
On SEPA’s flood maps, “high or medium” means rivers or the sea reach a home at least once in 200 years on average, mostly as if there were no flood defences. Grangemouth’s Hazard risk Grade is D−.
Grangemouth grades D− for hazard risk
Flood risk from rivers and the sea, against Scotland’s towns.
The share of homes at high or medium risk from rivers and the sea, ranked against every Scottish town (SEPA’s maps measure flood risk differently from England’s and Wales’s, so Scottish towns are ranked among themselves): fewer homes at risk is better. Towns with none at high or medium risk are ordered by their share at low risk, so they don’t all share one score. Surface water isn’t graded: the map shows it.
Where the water goes in Grangemouth
Turn layers on and off. SEPA’s flood maps: where rivers and the sea, and heavy rain, can reach. They mostly leave flood defences out.
The river and sea risk follows the town’s rivers.
13% of Grangemouth’s homes are at high or medium risk from rivers or the sea
SEPA’s national flood maps, which mostly leave defences out. A further 32% are at low risk.
Share of each Scottish town’s homes at high or medium risk from rivers and the sea. 14% of Scottish towns have none; Grangemouth has more than 97% of towns.
| # | Town | People | High or med. | |
|---|---|---|---|---|
| 1 | Armadale West Lothian | 12,590 | 0% | |
| 2 | Westhill Aberdeenshire | 11,778 | 0% | |
| 3 | Blantyre South Lanarkshire | 16,534 | under 0.1% | |
| … | ||||
| 38 | Prestwick South Ayrshire | 14,550 | 5.4% | |
| 39 | Troon South Ayrshire | 15,271 | 7.1% | |
| 40 | Grangemouth Falkirk | 16,028 | 13% | |
| 41 | Stonehaven Aberdeenshire | 11,164 | 13% | |
| 42 | Musselburgh East Lothian | 21,476 | 15% | |
| 43 | Dumbarton West Dunbartonshire | 21,027 | 21% | |
Scottish towns of 11,000 to 22,000 people.
SEPA’s flood maps (2025) for rivers and the sea tested against every address in the town (ONS NSUL), each output area weighted by its Census 2022 households. Rivers and sea can overlap; the worse band counts.
Flood risk in the places around Grangemouth
Share of homes at high or medium and at low risk from rivers and the sea. Tap a town for its page.
Grangemouth has more homes at high or medium risk than any neighbour in the table. Maddiston has none.
Get ready for what Grangemouth faces
Free warnings, what to do in a cloudburst, and what to check before you move.
- Sign up free to SEPA’s Floodline for flood alerts and warnings by text or call.
- Floodline: 0345 988 1188, 24 hours.
- Surface water rises in minutes, often with no warning issued: stay out of underpasses and dips.
- Keep the gullies and drains outside your home clear of leaves.
- Report a blocked road drain to the council.
- Never walk or drive through floodwater: 30 cm of moving water can float a car.
- Move valuables, papers and medicines upstairs.
- Turn off gas, electricity and water if you’re told to.
- Check the address on SEPA’s flood maps: they show rivers, the sea and surface water.
- Read the Home Report: the seller’s property questionnaire asks whether the home has flooded.
- Homes built before 2009 can get flood cover through Flood Re, the government-backed scheme; newer homes can’t.
What this data can and can’t tell you
- Defences mostly left out. SEPA’s maps show where water can reach as if most flood defences weren’t there, except where its detailed modelling includes a formal scheme. A town behind a defence can look more exposed than it is.
- One town, many streets. Risk is street by street. Check a specific address on SEPA’s flood maps before you buy or rent.
- Scotland is measured differently. SEPA publishes no count of homes at risk, so each address in the town is tested against its map, as in Wales. SEPA’s medium band runs to 1 in 200 years (England’s stops at 1 in 100), and its high band starts at 1 in 10, so Scottish figures lean higher than English ones.
Questions about flooding and hazards in Grangemouth
Does Grangemouth flood?
13% of homes are at high or medium risk from rivers and the sea on SEPA’s flood maps, which mostly leave flood defences out. Grangemouth grades D− for hazard risk against Scotland’s towns.
Where can I find flood warnings for Grangemouth?
SEPA issues flood alerts and warnings for Scotland through Floodline: sign up free for texts or calls, or ring 0345 988 1188, 24 hours.
Contains SEPA data © SEPA 2025. Contains OS data © Crown copyright and database right 2026. Contains Royal Mail data © Royal Mail copyright and database right 2026.
Sources: SEPA Flood Maps (2025), river and coastal flood extents at high, medium and low likelihood, tested against every ONS NSUL address point (September 2026) in the locality; Scotland’s Census 2022 households by output area · TownRatings grades: our own summary of the data, ranked against Scotland’s towns only. All under the Open Government Licence v3.0.
Contains public sector information licensed under the Open Government Licence v3.0. Contains HM Land Registry data © Crown copyright and database right 2026. Contains OS data © Crown copyright and database right 2026 (ONS boundaries). Northern Ireland: Source: NISRA; contains Land & Property Services data and Ordnance Survey of Northern Ireland information, © Crown copyright, licensed under the Open Government Licence v3.0. Scotland: contains National Records of Scotland data, Registers of Scotland data and SEPA data, © Crown copyright / © SEPA 2025, licensed under the Open Government Licence v3.0.