Yes, in parts, and the parts are entirely predictable. About a quarter of postcodes here carry a high rating on at least one flood measure. Around 700 properties sit somewhere on the river and sea risk mapping. The one flood on the record came from defences being overtopped rather than defences being absent. The question in Langport is never whether the town floods, it is which side of the causeway you are buying on, and the town has known the answer for about eight hundred years.
Start with rivers and the sea. In the Environment Agency's flood zones, about 13% of the town's postcodes fall in zone 2 and about 2% in zone 3. Those are exclusive bands rather than nested ones: zone 3 is the higher-probability core, zone 2 is the medium-probability fringe sitting beyond it. The smaller number is the more serious one, which is the sort of thing that catches people out when they skim a search report.
Surface water does not come with a separate published share for Langport, so it arrives folded into the combined postcode indicator further down rather than as its own line. What is recorded separately is the drainage. Roughly 17% of postcodes sit inside the Parrett Internal Drainage Board area, which is the organisation that keeps this landscape drained on purpose rather than by good fortune. About 1% of the area falls within a historic flood extent, and the single recorded event on the register, in February 2014, was a main river overtopping its defences.
The climate-adjusted zone, which models a future allowance rather than today's risk, currently returns nothing at all for Langport: none of the town's postcodes fall inside it. That is genuinely good news, held with the loose grip that any model of the 2080s deserves.
For insurance, the practical effect is that underwriters price the address and not the town. A house on the hill and a house near the bridge can sit in the same postal district and get quoted like they are in different counties. Get an indicative quote before instructing a solicitor rather than after exchange, ask the seller directly about past claims and internal water, and read the excess as carefully as the premium, because on higher-risk addresses the excess is usually where the real answer is hiding.
At postcode level, folding surface water in alongside rivers and sea, about 23% of Langport postcodes carry a high rating on at least one measure, around 29% a medium rating and about 39% a low one. These bands overlap with the flood zone shares above rather than sitting alongside them, so they are not figures to add together. They are a wider net catching more kinds of water.
Counts of homes land harder than shares of postcodes. On the Environment Agency's rivers-and-sea property mapping, 698 properties in Langport carry some level of risk, of which 27 sit at high risk, 89 at medium and 193 at low. Twelve of the high-risk properties are residential. Only postcodes that carry some risk appear on that mapping at all, so this is a count of the exposed rather than a survey of the whole town.
Then the question the flood maps usually dodge, which is whether anything actually stands between the water and the building. About 20% of postcodes sit inside a modelled high-risk extent with no defence present in the model, against roughly 8% where a defence is present. A defence in the model is not the same as a dry house. February 2014 established that locally, with the defences in place and the water going over the top of them.
On sea level, the nearest tide gauge with a long record is at Devonport, where measurements from 1962 to 2015 show a rise of about 2.35 millimetres a year. That is a measured historic rate on the coast rather than a forecast for the town, and it matters here mainly because the Parrett is tidal below Langport, so what the sea does eventually becomes what the river does.
Flooding is the clear weak spot in this town and the one thing a buyer should spend money investigating before anything else. Put the exact address into the long-term flood risk service, because the difference between the high ground and the low ground here is the difference between a pleasant Somerset town and an annual conversation with your insurer.