Mostly no, and what risk exists is rain rather than river. The town sits inland between two moors, on ground that drains rather than collects. Only a small slice of it falls inside the formal river flood zones. About one postcode in ten carries a high rating on at least one flood measure, and nothing here has a recorded flood history. The risk is genuine but narrow, and it belongs to specific addresses rather than to the town name.
For rivers and the sea, the Environment Agency's mapping puts roughly 3% of the area's postcodes in flood zone 3 and about 1% in flood zone 2. Those two are exclusive bands rather than nested ones. Zone 3 is the higher-probability core, and zone 2 is the additional medium-probability fringe sitting beyond it, which is why the smaller number is the outer ring. Four percent of postcodes in total, then, have any formal watercourse exposure at all.
Surface water is the other half of the question and it does not get its own headline figure. Rain running off high ground finds low points, gutters and culverts, and none of that appears in the river zones because the river zones are not measuring it. The combined postcode indicators further down fold it in, which is where the difference between a small river footprint and a wider risk picture comes from.
Looking forward, the Environment Agency's climate-adjusted mapping raises the river-and-sea zone share to about 4% of postcodes. That is a small increase on a small base, and it is a modelled allowance for a warmer century rather than a prediction about any particular winter.
For insurance, the practical effect is binary rather than gradual. An address inside zone 3, or one flagged high on the risk indicators, will change what an insurer quotes and may change the excess on the flood element specifically. An address outside them will barely register. The move is to get an indicative quote on the exact property before instructing a solicitor, because the quote is the honest answer and the postcode average is not.
On the combined measure, which folds surface water in alongside rivers and the sea, about 10% of the area's postcodes rate high on at least one indicator, about 10% rate medium and roughly 25% rate low. Those bands overlap the flood zone shares above rather than adding to them. The same street can appear in both counts, and treating the two measures as cumulative is how a moderate risk picture gets turned into a frightening one.
The count of actual homes lands better than any share. In the Environment Agency's rivers-and-sea mapping, 12 postcodes carry some risk, and 278 properties sit inside them. Of those, 54 are rated high, 2 medium and 14 low, with 45 of the high-rated ones residential. Postcodes with no risk do not appear in that list at all, so this is the exposed end of the town rather than the whole of it.
Whether anything stands between the water and those homes is the question most flood summaries skip. Here the modelled high-risk extent covers about 3% of postcodes undefended and about 3% defended, the same figure either way. No defence is doing meaningful work in that model. Nobody should read the word "defended" as a guarantee in any case, since it means a structure is present in the model, not that a house behind it stays dry.
Every postcode here falls under a shoreline management plan, and the stated policy across the twenty, fifty and hundred-year horizons is no active intervention. That is an intention rather than a promise, and no active intervention means precisely what it sounds like. For a town roughly six kilometres from the coast it changes little day to day, but it is the official position. At the nearest tide gauge, at Devonport, the measured rise across the 1962 to 2015 record runs at about 2.4 millimetres a year. A historic rate, not a forecast.
Nothing in the area carries a record of past flooding. That is worth something, since recorded events are the strongest evidence a place has form. It is not proof that water has never come through a door here, only that no such event sits in the record.
Middling, then, and middling in the useful sense. Most of Callington will go a lifetime without a wet carpet, while a short and identifiable list of addresses carries risk that any comforting town-level summary would quietly bury.