Bloxham carries very little risk from rivers and a more noticeable risk from rain with nowhere to drain. Almost none of the area is in the main river flood zones. Surface water is where most of the risk comes from. A minority of postcodes rate high on at least one measure. Most homes here are fine, and the ones that aren't usually sit low down.
The Environment Agency's river-and-sea flood zones put about 1% of postcodes in the Bloxham area in Zone 2 and none in Zone 3. The zones are separate bands: Zone 3 is the highest-probability land, and Zone 2 is the medium-probability fringe beyond it, so a small Zone 2 share and an empty Zone 3 sit together comfortably. The Environment Agency has five recorded flood events in the area, the most recent in July 2007, when a main river overtopped its channel with no raised defences in place. The Saxon village was built on the banks of a tributary of the Sor Brook, so the water has been part of the plan for about fifteen centuries.
Surface water is a separate problem, and the river zones don't capture it. Heavy rain on the clay of a valley edge, with Hobb Hill above, runs downhill to whatever is lowest. Plenty of homes with no river anywhere near them still flood this way, and the mapping that tells a buyer they are clear of the river says nothing about the road outside after a storm.
With the Environment Agency's allowance for climate change added, the flood-zone share for the area moves to about 1%, a small step on a small base.
At these levels most houses should be routine to insure. A home on one of the higher-risk postcodes is a different conversation, where the premium and the excess depend on the insurer's view of that exact spot. Put the exact address into the Environment Agency's long-term flood risk service and read the surface-water result as well as the river one, because the two can disagree on the same house.
Counting every flood measure together, surface water included, about 8% of postcodes across Bloxham and the surrounding villages rate high on at least one, 7% medium and 20% low. A postcode only needs one of those measures to qualify, which is why these shares run ahead of the river zones.
Counted as properties, the Environment Agency's rivers-and-sea mapping lists 260 properties across the 15 postcodes that carry some river risk. Of those, 23 are at high risk, 16 of them homes, six at medium and 22 at low. Postcodes with no river risk at all don't appear in that list.
On the modelled extents, no postcode in the area is inside the high-risk river extent, defended or undefended, and about 1% is inside the low-risk extent without defences. "Defended" in that model only means a defence appears on the map. It says nothing about whether the defence would hold, and here there is barely anything for it to defend.
The nearest tide gauge is at Portsmouth, where the sea rose at about 2 millimetres a year between 1962 and 2023. It is a measured rate at a harbour a long way south, and the only coastal issue for a hillside village in north Oxfordshire is the drive to the beach.
Flood risk in Bloxham is middling: the river risk is close to nothing, while surface water makes a few low-lying addresses a real question.