FloodRadar
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London, Greater London
Up to Low likelihood
Properties in N21 1LN sit in the Environment Agency's Low 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% | 0 | 0 |
| Medium | 1% – 3.3% | 0 | 0 |
| Low | 0.1% – 1% | 1 | 1 |
| Very low | below 0.1% | 0 | 0 |
Over a 25-year mortgage, a property in a low-likelihood area has a 2–22% chance of flooding at least once.
The ground here sits at about 38 m above sea level and falls 31 m across the surrounding 800 m. Surface water reaching this point runs off ground lying to the south-east, 11.3 m higher.
Because properties in the low likelihood band; 6 recorded floods nearby; 140 official warnings since 2006.
The map above shows the real EA rivers & sea likelihood cells around N21 1LN. 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 2021 | ea06JanuaryWinter2021 | ~1.1 km |
| Jan 2000 | 06DecemberWinter2000 | ~1.1 km |
| Jan 1992 | 06SeptemberAutumn1992 | ~11.0 km |
| Jan 1987 | 06OctoberAutumn1987 | ~1.8 km |
| Dec 1964 | 06JulySumer1964 | ~0.3 km |
| Dec 1964 | 06JulySummer1964 | ~0.4 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) · Conall (2024, 3 warnings nearby) · Henk (2024, 3 warnings nearby) · Fergus (2023, 1 warnings nearby)
| Gauge | River | Distance | Typical high | Highest on record |
|---|---|---|---|---|
| Enfield, The Chine | Salmon Brook | 1.1 km | 2.20 m | 2.42 m |
| Powys Lane | Pymmes Brook | 2.6 km | 2.43 m | 2.05 m |
| Edmonton Green | Salmon Brook | 3.5 km | 0.80 m | 1.19 m |
| Edmonton, Silver Street | Pymmes Brook | 3.8 km | 1.70 m | 1.45 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 |
|---|---|---|---|---|
| Deadmans Bridge Cso | Pymmes Brook | 2.6 km | 35 (2024) | 93 |
| N/a | N/a | 2.7 km | 0 (2024) | 0 |
| N/a | N/a | 3.0 km | 5 (2024) | 10 |
| Church Hill Road | Trib Of Pymmes Brook | 3.8 km | 4 (2024) | 2 |
Official annual EDM figures — a water-quality signal for local watercourses, not a property flood-risk factor.
10 mapped flood-defence assets within 500 m — nearest ~270 m (natural high ground, embankment, wall, spillway). 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 N21 1LN — all in the N21 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. Place names: Contains OS data © Crown copyright and database rights 2026. Contains Royal Mail data © Royal Mail copyright and database right 2026. Contains National Statistics data © Crown copyright and database right 2026. Licensed under the Open Government Licence v3.0. 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 N21 district.