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Does WA11 flood?

Yes — parts of the WA11 district carry real flood risk: 12 of its 23 at-risk postcodes reach the Environment Agency's High likelihood band. The WA11 postcode district covers Rainford, Blackbrook, Haydock, Moss Bank, close to St Helens, Ashton-In-Makerfield, Warrington, and surrounding villages in parts of Greater Manchester and Warrington.

23 postcodes in the WA11 district appear in the Environment Agency's rivers-and-sea flood-risk dataset — worst bands: 12 high, 1 medium, 10 low. A postcode not listed here has no properties in any recorded risk band (which is good news, but never proof it cannot flood).

Free preview first · full report £19

Which WA11 postcodes are at risk?

WA11 0AB up to High WA11 0AD up to High WA11 0AE up to High WA11 0UA up to High WA11 8LN up to High WA11 8LP up to High WA11 8LS up to High WA11 8LW up to High WA11 8LY up to High WA11 8LZ up to High WA11 8PW up to High WA11 8SZ up to High WA11 7HU up to Medium WA11 0DQ up to Low WA11 0UY up to Low WA11 0XA up to Low WA11 0XP up to Low WA11 0XR up to Low WA11 7BW up to Low WA11 7PL up to Low WA11 7RJ up to Low WA11 8DL up to Low WA11 9BA up to Low

Rivers and flooding history near WA11

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

134 official flood warnings and alerts have been raised within ~10 km of the district's centre since 2006 (41 at warning level or above), most recently 4 September 2026. Warnings cover flood areas, not individual addresses.

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

Records, not floods: no outline on the record is not evidence a place has not flooded.

🏠 Buying or renting in WA11? 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

WA10 WA12 WA13 WA9 WA14 WA8 WA15 WA7

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.