Does S20 flood?

Yes — parts of the S20 district carry real flood risk: 7 of its 13 at-risk postcodes reach the Environment Agency's High likelihood band. The S20 postcode district covers Beighton, Mosborough, Aughton & Swallownest, close to Meadowgate Regulator, Killamarsh, Woodhouse Mill Regulator, and surrounding villages in parts of South Yorkshire and Derbyshire.

13 postcodes in the S20 district appear in the Environment Agency's rivers-and-sea flood-risk dataset — worst bands: 7 high, 3 medium, 3 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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Which S20 postcodes are at risk?

S20 1AE up to High S20 1AH up to High S20 6TB up to High S20 7HE up to High S20 7HG up to High S20 7HN up to High S20 7HP up to High S20 1ED up to Medium S20 1EE up to Medium S20 3AD up to Medium S20 1AA up to Low S20 1AG up to Low S20 1DF up to Low

Rivers and flooding history near S20

The rivers that matter here, each monitored live on FloodRadar:

Rother Valley Lake on the Rother Washlands — 2.1 km away, highest on record 1.32m
Killamarsh on the River Rother — 2.1 km away, highest on record 4.36m
Woodhouse Mill Regulator on the River Rother — 2.6 km away, highest on record 5.82m
Woodhouse Mill on the River Rother — 2.7 km away, highest on record 4.46m

234 official flood warnings and alerts have been raised within ~10 km of the district's centre since 2006 (93 at warning level or above), most recently 30 August 2026. Warnings cover flood areas, not individual addresses.

Recorded flood extents near the district (Environment Agency record):

October 2023 - Storm Babet - Recorded Flood Outline (2023) — about 3.3 km from the centre
2022 February Flood Incident -Storm Dudley, Eunice and Franklin (2022) — about 27.1 km from the centre
2021 January Flood Incident - Storm Christoph (2021) — about 58.3 km from the centre
2020 February Flood Incident - Storm Dennis (2020) — about 52.8 km from the centre

🏠 Buying or renting in S20? The full property flood-risk report covers any postcode here — the official likelihood band, every recorded flood nearby with distances, warning history year by year, how the local rivers behave, and an insurance outlook, print-ready for £19. See what's in the report →

Flood risk in nearby postcode districts

S21 S18 S17 S25 S14 S26 S13 S12

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.