FloodRadar
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FloodRadar
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Yes — parts of the SY21 district carry real flood risk: 5 of its 6 at-risk postcodes reach the Environment Agency's High likelihood band. The SY21 postcode district covers Chirbury & Worthen, Rhiwcynon, Trelystan and Trewern, Welshpool Castle, close to Buttington, Meifod, Crewgreen, and surrounding villages in parts of Powys and Shropshire.
6 postcodes in the SY21 district appear in the Environment Agency's rivers-and-sea flood-risk dataset — worst bands: 5 high, 1 low. A postcode not listed here has no properties in any recorded risk band (which is good news, but never proof it cannot flood).
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The rivers that matter here, each monitored live on FloodRadar:
131 official flood warnings and alerts have been raised within ~10 km of the district's centre since 2006 (73 at warning level or above), most recently 12 March 2026. Counted from the warning records of Natural Resources Wales; the Environment Agency's record covers England only. Warnings cover flood areas, not individual addresses.
The Environment Agency's Recorded Flood Outlines cover England only, so there is no mapped flood record here to be empty — this is an absence of coverage, not an absence of floods.
Band = the worst likelihood band of any property in that postcode (EA Risk of Flooding from Rivers & Sea, defence-adjusted, area-level). Check any postcode in detail — or get the full £19 property report — at the property flood-risk report. © 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.