Yes, and the geography leaves no room for argument. The town sits at the head of a tidal estuary, which is the same feature that makes it worth looking at. About one postcode in eight falls in the top river-and-sea flood zone. Over half sit within a short walk of tidal water. The view and the risk here are not two separate things.
On the Environment Agency's river-and-sea mapping, 12% of the area's postcodes fall in flood zone 3, the highest-probability band, with a further 2% in flood zone 2, the medium-probability fringe that sits outside it. Zone 2 being the smaller figure is not a mistake in the arithmetic: it is the extra ring around zone 3, not a wrapper containing it.
Recorded history supports the mapping. 7% of postcodes sit inside a recorded historic flood outline, drawn from 19 recorded events, the most recent in December 2012 and attributed to an ordinary watercourse rather than the main river. Small channels and surface water do their share of the damage here, so a buyer who checks only the river map has checked half the question.
With a climate allowance applied, the zone share rises to 17% of postcodes. That is a forward look already built into the mapping rather than a claim about any particular decade.
The practical consequence is that insurance comes before offers. Cover is obtainable, at a price and an excess set by the address rather than the town, and any lender will want it in place before completion. The Flood Re scheme exists to keep household cover available on higher-risk homes, though it does not cover properties built since 2009. An indicative quote for the exact address, obtained before a solicitor is instructed, is the cheapest hour a buyer here will spend.
Taking every indicator together, including surface water, 27% of postcodes carry a high rating on at least one measure, 9% a medium and 29% a low. Those bands overlap with the flood-zone figures rather than adding to them, since one postcode can appear on more than one indicator.
Counted as homes rather than postcodes, the Environment Agency's rivers-and-sea mapping lists 855 properties across the postcodes that carry any risk at all, with 235 rated high, 71 medium and 136 low. Of the high-risk ones, 179 are residential. Postcodes with no risk never enter that list, so this describes the exposed part of town in detail rather than the town as a whole.
Then the question the flood maps rarely put plainly: whether anything stands between the house and the water. Around 12% of postcodes sit inside a high-risk extent with no defence present in the model, and around 12% inside one where a defence is present. Present in the model means a structure appears in the mapping. It does not mean adequate, maintained, or built for the storm that eventually turns up.
The water is close by any measure. 53% of postcodes sit within 500 metres of tidal water, which is a threshold the dataset defines rather than a statement about a specific house, and the median distance is roughly 480 metres. At the nearest point, it is 10 metres.
Every postcode here falls under a shoreline management plan. The stated policy for the next 20 years is to hold the line, moving over the 50 and 100 year horizons to a mix of holding the line and managed realignment, which is the official phrasing for surrendering ground to water deliberately. A policy is a stated intention to maintain defences over that horizon. It is not a defence, and it is not a promise.
At the nearest tide gauge, Devonport, the measured rate across its 1962 to 2015 record is roughly 2.4 millimetres of sea level rise a year. That is recorded history rather than a forecast, and it is the direction the shoreline policy is written against.
Flood risk is the weakest part of the case for living here, and no amount of stonework or estuary light offsets it. Buy above the zones and it belongs to somebody else. Buy inside them and do it with the mapping open, a quote in hand, and no illusions about what the word defended is doing on that map.