Yes, and not in the marginal, check-the-map-to-be-sure way. Most of the town sits in the highest river-and-sea flood zone. The last recorded flood here came in over the defences from the sea. Most of the modelled high-risk ground has no defence in front of it at all. Bridgwater is a town built on the edge of the Somerset Levels beside a tidal river, and the water has never been talked out of it.
On the Environment Agency's river-and-sea mapping, about 62% of the area's postcodes fall inside flood zone 3, the highest-probability band. Another 1% sit in flood zone 2, which is the medium-probability fringe lying beyond zone 3 rather than a ring around it, so the small number is not the reassurance it looks like. Roughly 5% of postcodes sit inside a recorded historic flood extent, and there are 67 recorded flood events for the area. The most recent came on 27 February 2014, from the sea, caused by overtopping of defences.
Surface water is measured separately and does not appear on those zone maps at all. It gets folded into the postcode-level indicator further down. What the zone maps also do not show is the drainage regime: about 58% of postcodes here sit within the Parrett Internal Drainage Board, which exists because this landscape does not drain itself and has needed managing for centuries.
Looking forward, the Environment Agency's climate-adjusted mapping puts about 64% of postcodes in the zone. That is a modelled allowance for a wetter, higher-sea future rather than a prediction of any particular year, and it moves the figure in the direction you would expect.
For insurance, this matters more than any other single fact about buying here. Expect to be asked for the flood history of the specific property, expect quotes to vary wildly between insurers, and get an indicative quote before you instruct a solicitor rather than after. Flood Re, the industry scheme that helps make cover available in high-risk areas, does not apply to homes built since 2009, so a new-build on the edge of town does not automatically inherit that backstop.
Taking every indicator together, including surface water alongside rivers and sea, about 12% of the area's postcodes rate high on at least one flood measure, about 26% rate medium and about 65% rate low. Those bands overlap with the zone figures rather than adding to them. They are a different question asked of the same ground.
Counted as homes rather than postcodes, the Environment Agency's rivers-and-sea mapping lists 18,564 properties across the postcodes that carry any risk at all. Of those, 722 are at high risk, 523 at medium and 13,437 at low, with 585 of the high-risk properties residential. Postcodes with no modelled risk do not appear in that list, so this is the exposed portion of the town rather than the whole of it.
The defence question is the one buyers actually need answered. About 62% of postcodes sit inside a modelled high-risk extent with no defence present in the model, against about 5% where a defence is present. Present in the model means a structure exists in the mapping. It does not mean the property is protected, and the February 2014 event went over the defences that were there.
The coast is closer than the town's inland feel suggests. Around 34% of postcodes sit within 500 metres of the coastline, the nearest is about 17 metres from it, and the median distance is roughly 730 metres. The shoreline management policy for this stretch is hold the line at the 20, 50 and 100 year horizons, which is a stated intention to maintain defences rather than a guarantee of funding, and not the same thing as a defence already standing where you are buying. At the nearest tide gauge, at Devonport, the measured rate over the 1962 to 2015 record is about 2.35 millimetres of sea level rise a year.
Flooding is the worst thing about Bridgwater, and it is not close. Everything else here can be weighed up over a coffee; this one needs the address-level check, the insurance quote and a clear head before you commit.