Yes. Newport Pagnell has a real flood risk, and it comes from the two rivers that meet beside the town. Most postcodes are outside the river flood zones. A minority are firmly inside them. Surface water widens the map further. The sea has nothing to do with it.
The River Ouzel, also known as the Lovat, joins the Great Ouse close to the town, and a large set of sluice gates near Tickford Bridge controls flooding further downstream. The Environment Agency's river-and-sea mapping puts about 6% of Newport Pagnell's postcodes in flood zone 3, the highest-probability band. Another 13% fall in flood zone 2, the medium-probability fringe beyond it. The fringe is bigger than the core, as usual on a wide, flat floodplain where a lot of land is a little at risk. Lathbury, almost surrounded by a meander of the Great Ouse, shows how much ground the river claims here.
Surface water, the rain that floods streets and gardens before any river overflows, has no separate share for the town. It is folded into the postcode-level measure further down this page. The ground needs managing, too. About 31% of the town's postcodes come under the Buckingham and River Ouzel Internal Drainage Board, whose job is keeping water moving off land that would otherwise hold it.
The Environment Agency also models how the zones change under a changing climate. On that measure, about 20% of the town's postcodes fall inside the climate-adjusted flood zone. That is a modelled view of where the floodplain is expected to reach, and no particular year is attached to it.
Insurers price by address, so in a town split between a floodplain and higher streets, two houses a few minutes apart can get very different quotes for cover. On the lower streets, get an insurance quote for the exact property while the price is still being negotiated. The premium is part of what the house costs.
A broader measure looks at each postcode across several flood indicators at once, surface water included, and records its highest rating. On that basis, about 16% of Newport Pagnell's postcodes rate high on at least one indicator, about 26% medium and about 49% low. Because it takes the worst of several measures, it is wider than the river zones alone.
The Environment Agency also counts properties, and for most buyers that is the more useful figure. Its rivers-and-sea mapping lists 2,015 properties in postcodes with some level of risk; postcodes with none do not appear at all. Of those, 51 properties are at high risk, 44 of them homes, with another 49 at medium risk, 376 at low risk and 731 at very low risk. Put that way, the high-risk part of town is a few streets' worth of front doors.
About 6% of the town's postcodes fall inside the high-risk flood extent with no defence included in the model, and about 1% fall inside it with a defence included. "Defended" means a defence appears in the Environment Agency's model. It says nothing about whether that defence will hold or how high the water would rise against it. A buyer should take the word as a reason to find out more about the defence, never as the end of the question.
Portsmouth is the nearest tide gauge in the Environment Agency's records, and between 1962 and 2023 it measured sea level rising by about 2 millimetres a year. The tide gauge closest to Newport Pagnell is on the south coast, so the sea level figure is the least of the town's flood worries.
Flood is where Newport Pagnell asks the most of a buyer. The risk is real on the lower streets and close to the rivers, and the higher streets are mostly clear.