Yes, some of it, and the village-wide average is no use to you whatsoever. Most of Martock sits outside the river and sea flood zones. About one postcode in six carries a high rating on at least one flood measure. On the edge of the Levels, water arrives from underneath and sideways as readily as it does down a channel. This is an address question wearing a village question's clothes.
Start with rivers and the sea. The Environment Agency's flood zones cover about 4% of the area's postcodes in zone three, the highest-probability band, and about 1% in zone two. Zone two being the smaller figure is not a misprint: it is the additional medium-probability fringe sitting beyond zone three, not a bigger circle containing it. So on the river-and-sea measure alone, the large part of the village is outside the mapped zones entirely.
The rivers are not the whole story here. About 21% of postcodes fall inside the Parrett Internal Drainage Board's area, which is the clue that drainage in this landscape is a managed activity rather than a natural one. The recorded flood register holds one event for the area, in 1979, when a main river exceeded its channel capacity with no raised defences in the picture, and the historic flood extent touches about 1% of postcodes. One entry in a register is a thin record rather than a clean sheet, and thin records are what make people confident.
Looking forward, the Environment Agency's climate-change allowance widens the mapped zone to about 5% of postcodes. That is a slightly larger footprint than the current zone three rather than a transformation, and it is a modelled allowance, not a schedule of events.
For insurance, the address is what gets priced, not the village. Homes inside the mapped zones can attract higher premiums, higher excesses, or questions at renewal that homes three streets away never face. Get an indicative quote on the specific property before you instruct a solicitor, because finding out at exchange is the expensive order to do it in.
On the broader indicator, which folds surface water in alongside rivers and sea, 17% of postcodes rate high on at least one measure, 22% medium and 36% low. Those bands overlap with the flood-zone shares above rather than adding to them, since a postcode can appear in both. It is the wider net, and it is the reason the honest answer to this question is longer than one line.
The count of homes lands harder than the share of postcodes. The Environment Agency's rivers-and-sea mapping lists 22 postcodes here carrying some level of risk, holding 628 properties between them. Of those properties, 49 are rated high risk, 52 medium, 86 low and 3 very low, with 21 of the high-risk ones being residential. Postcodes with no risk at all never appear on that list, so this is the affected slice rather than the whole village.
Whether anything stands between the water and the building is the question most flood summaries skip. About 4% of postcodes sit inside the modelled high-risk extent with no defence present in the model, and about 4% sit inside the high-risk extent with one present. Defended is a modelling term describing what exists in the model, not a guarantee about the house, and it should be read as information rather than comfort.
For context on the longer trend, the nearest long tide-gauge record is at Devonport, running from 1962 to 2015, which measured sea level rising by about 2.35 millimetres a year over that period. That is a recorded historic rate at that gauge, not a projection for anywhere.
Flooding is the part of Martock that will cost you sleep rather than money, and it is the poorest thing on this page: not because the whole village is wet, but because a real slice of it is, and only the exact address tells you which slice you are buying into.