Not as a village, yes as a handful of streets. The Parrett runs down the eastern edge of the parish. A small share of postcodes sits inside the mapped river zones. A larger share picks up a high rating once surface water is counted. This is a question that changes house by house, and the name on the road sign answers none of it.
Taking rivers and sea first, the Environment Agency's mapping puts about 4% of the area's postcodes inside flood zone 3, the highest-probability band, and about 1% inside zone 2. Zone 2 being the smaller number is not a misprint. The two are exclusive bands, with zone 2 the medium-probability fringe lying beyond zone 3 rather than a wrapper around it. The wetland of the Somerset Levels and Moors lies to the north, and the river forms the parish boundary to the east, so the geography of the risk is not mysterious.
Rivers are the tidy part of the problem. The postcode-level indicators fold in surface water, which is what arrives off saturated ground and overwhelmed drains without going near a channel, and they rate more of the village at risk than the river zones do. That gap is normal, and it is why a house can sit nowhere near the Parrett and still take water through the back door on the wrong August afternoon.
Adding the climate allowance, which is the Environment Agency's forward look layered onto present-day mapping, lifts the zone share to about 5% of postcodes. That is a modelled extension of the map's edges rather than a prediction about any particular winter.
For insurance the consequence is entirely address-specific. A home in a high-rated postcode attracts questions, and quotes for it vary far more between insurers than they do for an identical house two streets away. An indicative quote before instructing a solicitor is worth more than any paragraph on this page, because the premium is the fastest honest reading of the risk that anyone will hand you.
Across the full postcode set, about 12% rate high on at least one flood measure, 9% medium and 29% low. Those bands include surface water alongside rivers and sea, so they overlap the zone figures rather than stacking on top of them. Twenty-nine percent at low sounds worse than it reads: low is a small chance in any given year, and it covers a lot of ordinary ground.
Counted as homes rather than postcodes, the Environment Agency's rivers-and-sea mapping lists 212 properties across the 7 postcodes that carry any risk at all. Of those, 39 are in the high band, 13 medium and 9 low, and 27 of the high-band properties are residential. Only postcodes carrying some risk appear in that list, so 212 is the exposed set rather than the village.
On the modelled extents, about 5% of postcodes fall within a high-probability extent with no defence present in the model, and about 5% within a high-probability extent where a defence is present. Defended means a defence exists in the model. It says nothing about that defence's condition, its design standard or whether it will hold, and treating the word as reassurance is exactly how people end up surprised.
Sea level is the smallest part of this. The nearest tide gauge, at Devonport, records a rise of about 2.4 millimetres a year across its 1962 to 2015 record, which is a measured historic rate at the coast rather than a forecast. The exposure here runs through river and run-off, not tide.
No recorded historic flood extent covers the area, and that counts for something, since a record of past flooding is the strongest evidence available. It is not proof that water has never come up a garden here. It means nothing has been mapped, and mapping is better in some places than others.
Flood risk in South Petherton sits in the middle: most of the village is dry on every measure, a small and identifiable set of addresses is not, and the difference between those two groups is worth more of your solicitor's attention than the village average ever will be.