Properties at risk of flooding from surface water, Wales
Not official statistics
Homes and other properties in Wales at high, medium and low risk of flooding from surface water and small watercourses, in Natural Resources Wales's assessments of 2024 and 2025.
Surface water, high risk
39,869
2025
Verified against source, 1 November 2026, 21:08 UTC- Surface water, high risk
- Surface water, medium risk
- Surface water, low risk
Source: Natural Resources Wales, through the Welsh Government. Contains public sector information licensed under the Open Government Licence v3.0.
Data table
2 rows
| Category | Surface water, high risk | Surface water, medium risk | Surface water, low risk |
|---|---|---|---|
| 2024 | 39,720 | 20,687 | 83,267 |
| 2025 | 39,869 | 20,778 | 83,605 |
Source and licence
- Publisher
- Natural Resources Wales, through the Welsh Government
- Check it yourself
- https://stats.gov.wales/en-GB/44557520-6234-4a77-9263-cabfc00f4d72
- Licence
- Open Government Licence v3.0 – Contains public sector information licensed under the Open Government Licence v3.0.
- Retrieved
- 1 November 2026, 21:05 UTC
- Raw files fetched
- https://api.stats.gov.wales/v2/44557520-6234-4a77-9263-cabfc00f4d72SHA-256 99ae1bf9175a1df355dc324ec5e945e4caafa12fd92491699b011aba92795d68 · 13,597 bytes
- https://api.stats.gov.wales/v2/44557520-6234-4a77-9263-cabfc00f4d72/data?format=csvSHA-256 7d4af931029544525a5d81d1cd7510b40a3f760722e98e34416e8256488a2141 · 439,850 bytes
Verification
Verified against source, 1 November 2026, 21:08 UTC Run at 1 November 2026, 21:08 UTC; 6 of 6 figures matched the live source.
| Result | Check | Detail |
|---|---|---|
| Pass | Provenance recorded | Natural Resources Wales, through the Welsh Government; Open Government Licence v3.0; retrieved 2026-11-01T21:05:02Z; 2 raw file(s) |
| Pass | Raw files match recorded SHA-256 | 2 of 2 files intact |
| Pass | Re-parsing raw files reproduces figures | 6 of 6 figures and the headline reproduced |
| Pass | Figures are finite numbers | 6 figures, 0 invalid |
| Pass | Live source matches every figure | 6 of 6 figures match exactly after downloading 2 source file(s) again (2 byte-identical); the headline matches |
| Pass | StatsWales dataset is current | latest period 2025-12-31 ended 305 days before retrieval (limit 800) |
| Pass | StatsWales JSON edition agrees | 6 of 6 figures match the 5,616 rows of the JSON edition from https://api.stats.gov.wales/v2/44557520-6234-4a77-9263-cabfc00f4d72/data?format=json&page_size=10000&page_number=1 |
| Pass | The three regions add up to Wales | 48 of 48 cases of year, source, band, property type and defences, the three regions sum to Wales |
| Pass | The 22 councils add up to Wales | 48 of 48 cases of year, source, band, property type and defences, the 22 councils sum to Wales |
| Pass | The risk bands add up to all at risk | 312 of 312 cases of area, year, source, property type and defences, the high, medium and low bands sum to all at risk |
| Pass | Residential and non-residential add up to all | 416 of 416 cases of area, year, source, band and defences, residential and non-residential properties sum to all |
| Pass | Source page answers | https://stats.gov.wales/en-GB/44557520-6234-4a77-9263-cabfc00f4d72 – HTTP 200 |
Notes
- High risk is a chance of flooding greater than 1 in 30 each year; medium between 1 in 30 and 1 in 100; low between 1 in 100 and 1 in 1,000. NRW's figures for surface water are the same with defences and without.
- Natural Resources Wales's figures carry no statistical designation, and it replaces the dataset rather than revising it. It also gives a forecast for 2120, which the hub leaves out.