West Moors is mostly dry, and the wet parts are specific enough to find on a map. Almost all of it sits outside the river and sea flood zones. A smaller share of postcodes pick up a high rating once every water source is counted. The coast is the better part of ten kilometres away, so the sea is somebody else's problem. The risk here is real, narrow, and worth checking address by address rather than village by village.
The Environment Agency's river-and-sea mapping places around 2% of West Moors postcodes in flood zone three, the highest-probability band, and under 1% in flood zone two. Those two bands sit alongside each other rather than one inside the other. Zone two is the medium-probability fringe beyond zone three, which is why it can legitimately come out as the smaller of the pair. In a village this size, that is a strip following the water rather than a problem spread across the map.
Surface water does not get a share of its own in this area. It is counted inside a combined postcode indicator, described further down, which folds rainfall runoff in alongside rivers and the sea. That combined measure runs higher than the river-and-sea zone shares, and anyone whose worry is a flooded drive after a summer downpour rather than a river coming over its bank should read that one instead.
Looking forward, the Environment Agency's climate-adjusted mapping puts around 4% of postcodes inside the flood zones. That is the allowance for a wetter future rather than a description of today, and it is the figure a buyer with a thirty-year mortgage should probably weigh more heavily than the current one.
For insurance, the practical effect is binary rather than gradual. Most West Moors addresses will price like any other inland Dorset home. The minority sitting inside a mapped high-risk area will find that quotes come back with a larger excess, more questions about what has happened before, and in some cases a shorter list of insurers willing to bid at all. Getting an indicative quote for the specific address before instructing a solicitor costs nothing and settles the question early.
On the combined postcode indicator, which counts an address as at risk if it rates on at least one measure including surface water, around 8% of West Moors postcodes come out high, around 12% medium and around 37% low. Those bands overlap with the flood-zone shares above rather than adding to them, since the same address can appear in both counts.
Counted as homes rather than postcodes, the Environment Agency's rivers-and-sea mapping identifies 625 properties across the 16 West Moors postcodes that carry any risk at all. Of those, 191 sit at high risk, 187 of them residential, with 26 at medium and 106 at low. Postcodes carrying no risk do not appear in that count, so this is a picture of the exposed edge, not of the village.
On whether anything stands in the way, around 1% of postcodes sit inside high-risk extents with no defence present in the model, and around 2% inside high-risk extents where a defence is present. A further 3% fall in undefended low-risk extents. The word defended is doing less work than it sounds: it means the model knows a structure is there, not that the structure will hold, and not that the house behind it is safe.
Around 16% of postcodes fall within a shoreline management plan area, where the stated policy over the twenty, fifty and hundred year horizons is to hold the line. That is an intention to maintain coastal defences, not a promise and not a defence that necessarily exists yet. Given the coast sits roughly nine to ten kilometres off, it is background rather than foreground here anyway. At the nearest tide gauge, Portsmouth, the measured record from 1962 to 2023 shows sea level rising at around 2 millimetres a year, which is history rather than forecast.
No West Moors postcode falls inside a recorded historic flood outline. One flood event does appear in the record, in December 1999, attributed to a main river overtopping its defences. An absence of recorded flooding is genuinely encouraging and is not the same as proof that water has never arrived where nobody was keeping score.
Flood risk in West Moors comes out middling: comfortable for most of the village, genuinely serious for the few hundred homes along the exposed edge, and entirely dependent on which side of that line the address you are buying happens to sit.