Not from rivers or the sea, but not from nowhere either. No postcode sits in a river-and-sea flood zone. About one postcode in twenty rates high on at least one flood measure. About one in five carries a low-level flag. The risk here comes from rain, not a river, and it sits on particular streets rather than across the whole place.
None of Broad Blunsdon's postcodes fall in the Environment Agency's river-and-sea flood zones: 0% in Flood Zone 3, the highest-probability band, and 0% in Flood Zone 2, the medium-probability fringe beyond it. For a buyer, that removes the classic flood worry, the house sitting on a floodplain. This measure only covers rivers and the sea, so it isn't the whole answer.
Surface water is the other half of the answer. The brief carries no stand-alone surface-water share for the area, but the river-and-sea zones don't explain the flags that do appear further down. That leaves heavy rain, drains that can't keep up and ground that won't soak it away. Surface-water risk rarely shows up in a listing, because nobody photographs a road during a cloudburst.
The Environment Agency's climate-adjusted flood zone, which projects the river-and-sea zones forward under a changing climate, also puts 0% of postcodes inside it. On current modelling, the rivers stay out of the picture even with future change built in.
For insurance, a home outside the river-and-sea zones usually gets a straightforward quote. A postcode flagged for surface water can still change the premium or the questions an insurer asks. Get a quote for the exact address before committing to the purchase, because the postcode average won't be the figure on your policy.
Across the 131 postcodes assessed, about 5% rate high on at least one flood measure, about 10% medium and about 22% low. Those measures include surface water alongside rivers and sea, so these shares overlap with the zone figures above and are a different count. Separately, 17 addresses fall in the high band. Most postcodes carry no flag at all. The flagged minority is the reason to check the individual street, not the village name.
The Environment Agency's rivers-and-sea property mapping lists only postcodes that carry some risk, and here just one postcode appears, covering 28 properties. One property is at high risk, none at medium or low, and none of the high-risk properties is residential. As a count of homes, river and sea flooding barely registers.
On the modelled flood extents, 0% of the 135 postcodes fall inside a high-risk extent, whether a defence is present in the model or not. The low-risk undefended extent is also 0%. There is no case here of a flood wall being the only thing between a house and the water, because the modelling doesn't put the water near the houses.
The nearest tide gauge to Broad Blunsdon is at Portsmouth. It recorded an average sea-level rise of about 2 millimetres a year over its 1962 to 2023 record. That's a measured historic rate on the coast, not a forecast, and it's of limited relevance to a place this far inland.
The records hold no historic flood outlines for the area: 0% of it falls inside recorded flood extents. That's reassuring, but it isn't a guarantee, since small surface-water floods often go unrecorded.
Flood risk here is middling. River and sea flooding is close to absent. A minority of postcodes carry a surface-water question that only the exact address can answer.