Swanmore carries a real but manageable flood risk, and the danger is not the one most buyers picture. Almost none of the area sits in the serious river-flood zones. Rain running off the ground is the actual concern. It affects a meaningful minority of postcodes rather than the whole village. Anyone treating flooding here as a non-issue has looked at the wrong map.
Start with rivers and the sea, because that is what people worry about first and it turns out to be the smaller story. Only a little over one in a hundred properties across the area fall inside the highest river-flood zone, and the next zone down accounts for well under one in a hundred more. For a settlement in the Meon Valley, that is a reassuringly thin slice. The valley floor holds some risk, but the bulk of the housing sits clear of the worst of it, and river flooding is not the thing that should keep a Swanmore buyer awake.
Surface water is where the honesty is needed. When heavy rain arrives faster than the ground and the drains can shift it, about one in six postcodes here carry a high risk of surface-water flooding, with another one in seven at a medium level and roughly three in ten touched by at least a low level. That is a good deal of the map catching water in a downpour, and it is exactly the risk that gets waved away because it does not come with a river attached. A lane that floods every few winters is still a lane that floods, whatever the label on it.
The forward picture nudges the wrong way, as it does almost everywhere. Once a climate allowance is folded in, the share of properties in the meaningful river-flood zone rises to about one in forty. That is not a dramatic jump, but it points in one direction rather than none, and a house bought for the next thirty years should be judged on the climate-adjusted number rather than today's. The water is not getting less patient with age.
For insurance, the practical effect is address-specific rather than village-wide. A home on high, well-drained ground will likely see cover and premiums that barely register the issue, while a property in one of the surface-water hotspots may face closer questions, higher excesses, or a request for a flood history before an insurer commits. None of that is a reason to walk away, but it is a reason to get a quote in writing on the actual address before you fall for it, not after you own it. The postcode average will not be the number that lands on your policy.
So is Swanmore at risk of flooding. Enough to sit below average on the question, and enough that the survey and the insurance quote earn their fee here. The rivers are mostly behaving. The rainwater is the part you check.