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Up to High likelihood
Properties in SN9 5DL sit in the Environment Agency's High flood-likelihood band (worst property). The band is the worst found in the postcode — it describes the land around properties (defence-adjusted, rivers & sea), not any single address, and not today's conditions.
| Likelihood band | Annual chance | Properties | Of which homes |
|---|---|---|---|
| High | greater than 3.3% | 1 | 1 |
| Medium | 1% – 3.3% | 1 | 0 |
| Low | 0.1% – 1% | 1 | 1 |
| Very low | below 0.1% | 0 | 0 |
Over a 25-year mortgage, a property in a high-likelihood area has at least a 57% chance of flooding at least once.
The ground here sits at about 112 m above sea level and falls 19 m across the surrounding 800 m. Surface water reaching this point runs off ground lying to the west, 10.6 m higher.
Because properties in the high likelihood band; 5 recorded floods nearby; 26 official warnings since 2006.
The map above shows the real EA rivers & sea likelihood cells around SN9 5DL. The small panels are illustrative previews of the report's per-layer map views — the full report draws each layer for real, plus recorded extents, defences and a building picker on an interactive map.
Warnings cover flood areas, not individual addresses.
| Date | Recorded flood | Approx. distance |
|---|---|---|
| Jan 2014 | Pewsey_Winter 2013 to 2014 | ~0.1 km |
| Jan 2014 | Pewsey_Winter 2013 to 2014 | ~0.6 km |
| Mar 1996 | This represents flooding in the area in 1996 | ~0.3 km |
| Feb 1990 | This represents flooding in the area in 1990 | ~0.2 km |
| Mar 1979 | This represents flooding in the area in 1979 | ~0.2 km |
EA Recorded Flood Outlines — absence of a record never proves a place has not flooded. The full report tests whether any extent covered the exact spot.
2013-14 UK winter floods (2013, 5 warnings nearby) · Henk (2024, 4 warnings nearby) · Herminia (2025, 1 warnings nearby) · Bert (2024, 1 warnings nearby)
| Gauge | River | Distance | Typical high | Highest on record |
|---|---|---|---|---|
| Pewsey | River Avon | 0.2 km | 0.18 m | 0.70 m |
| Upavon East | River Avon | 5.0 km | 0.60 m | 1.04 m |
| Upavon West | River Avon | 5.0 km | 0.70 m | 1.14 m |
| Everleigh | Groundwater Level | 6.4 km | 135.00 m | 135.48 m |
Live levels, predictions and rain-response behaviour are on each gauge's page and in the property report.
| Overflow | Discharges into | Distance | Spills | Hours |
|---|---|---|---|---|
| Swan Pumping Station | River Avon (s) | 0.2 km | 15 (2024) | 13 |
| Pewsey Wastewater Treatment Works | River Avon (hampshire) | 1.0 km | 96 (2024) | 620 |
| Salisbury Road Pumping Station | River Avon | 1.0 km | 1 (2024) | 7 |
| Wilcot Pumping Station | Tributary Of The River Avon | 2.4 km | 25 (2024) | 261 |
Official annual EDM figures — a water-quality signal for local watercourses, not a property flood-risk factor.
22 mapped flood-defence assets within 500 m — nearest ~102 m (natural high ground, embankment, wall). Defences reduce risk, never remove it.
The interactive flood-risk map with a building picker (your exact house, not the postcode), the 2050s climate view, surface-water and planning flood zones at your building, exact recorded-flood distances, year-by-year warning charts, watercourses including culverted streams, an insurance outlook with the Flood Re rules, and a printable document with every dataset receipt — start with the free preview, unlock for £19.
At-risk postcodes near SN9 5DL — all in the SN9 district.
© Environment Agency copyright and/or database right 2025. All rights reserved. Some features of this map are based on digital spatial data from the Centre for Ecology & Hydrology, © NERC (CEH). © Crown Copyright and Database Rights 2025 OS AC0000807064. This product is produced in part from PAF® and Multiple Residence Data, the copyright in which is owned by Royal Mail Group Limited and/or Royal Mail Group plc. All rights reserved. Licence number AC0000807064. Recorded Flood Outlines and warning history © Environment Agency copyright and/or database right 2025. Storm-overflow figures: EA Event Duration Monitoring. Flood defences © Environment Agency (OGL v3). This page summarises public area-level data — it is not a flood-risk survey and not a substitute for the official GOV.UK service. All data sources & licences. More postcodes: the SN9 district.