Does TR17 flood?

Yes — parts of the TR17 district carry real flood risk: 6 of its 11 at-risk postcodes reach the Environment Agency's High likelihood band. The TR17 postcode district covers Long Rock, Marazion & St Erth, close to St Erth, Newlyn, Penzance, and surrounding villages in Cornwall.

11 postcodes in the TR17 district appear in the Environment Agency's rivers-and-sea flood-risk dataset — worst bands: 6 high, 1 medium, 3 low, 1 very 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 TR17 postcodes are at risk?

TR17 0DA up to High TR17 0DY up to High TR17 0EN up to High TR17 0HH up to High TR17 0HS up to High TR17 0HT up to High TR17 0EJ up to Medium TR17 0EG up to Low TR17 0HJ up to Low TR17 0HQ up to Low TR17 0EW up to Very low

Rivers and flooding history near TR17

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

ST ERTH — 4.7 km away
ST ERTH — 4.7 km away
St Erth on the River Hayle — 4.7 km away, highest on record 1.30m
Penzance Alverton on the Lariggan River — 5.3 km away, highest on record 0.68m

664 official flood warnings and alerts have been raised within ~10 km of the district's centre since 2006 (165 at warning level or above), most recently 2 March 2026. Warnings cover flood areas, not individual addresses.

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

Marazion, St Micheal's Mount car park (2023) — about 0.4 km from the centre
Marazion (2022) — about 0.1 km from the centre
CW9643 - Mounts Bay (2020) — about 0.1 km from the centre
CW9628 - Mounts Bay (2020) — about 0.1 km from the centre

🏠 Buying or renting in TR17? 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

TR16 TR18 TR15 TR19 TR14 TR20 TR13 TR21

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.