Yes. Parts of Deal are at real risk of flooding, and most of that risk comes from the sea. About one postcode in ten sits in the highest-risk river-and-sea flood zone. Nearly half are within a short walk of the beach. Once climate change is allowed for, the mapped zone covers most of the town. If you're buying here, check the flood risk before you fall for the view.
The Environment Agency's river-and-sea mapping puts about 10% of Deal's postcodes in flood zone 3, the highest-probability band, and another 13% in flood zone 2. The two zones don't overlap. Zone 2 is the medium-probability strip beyond zone 3, not a bigger area that contains it. Together they describe the parts of town where the sea, or a river, has a mapped route in. The Agency holds 15 recorded flood events for the area. The most recent was in February 1953, when the sea came over the defences.
This page carries no separate figure for surface water. Rain that can't drain away is counted inside the postcode measures below, alongside rivers and the sea. About 6% of postcodes also fall within the River Stour (Kent) Internal Drainage Board's area. That board manages water levels on the low land, and homes inside its area usually pay a drainage charge.
The picture changes once climate change is allowed for. The Environment Agency's climate-adjusted flood zone takes in about 63% of Deal's postcodes. That's a projection of where the risk heads over time, not today's map. If you're buying for the long term, it's the more honest of the two figures.
Insurers price by address, not by town, so two houses on the same street can get very different quotes. If a home sits in a mapped zone, expect insurers to ask about it and possibly charge more for it. Get an indicative quote before you instruct a solicitor, not after you've exchanged.
Counting every measure together, surface water included, about 17% of postcodes carry a high risk on at least one measure, 23% a medium risk and 44% a low risk. These bands overlap with the flood zones above because they fold in more sources of flooding. Don't add the two sets of figures together, and don't read them as the same thing.
The Environment Agency's property count gives the most useful figure. Of 4,961 properties in the postcodes it lists, 195 are at high risk of flooding from rivers or the sea, 177 at medium risk, 1,045 at low risk and 2,116 at very low risk. Only postcodes with some risk appear in that list at all, so the rest of the town isn't in it. A count of homes brings the risk down to street level in a way that a share of postcodes can't.
The next question is whether anything stands between the water and the house. About 8% of postcodes sit in a high-risk area where the model shows no defence. About 3% sit in a high-risk area where it does. "Defended" only means a defence exists in the Environment Agency's model. It doesn't mean the house stays dry, and the 1953 flood came over defences. Another 14% of postcodes sit in a low-risk area with no defence shown.
The sea is close. About 44% of postcodes lie within 500 metres of the coast. That's the line the data draws, not a claim about any one address. The nearest postcode is 5 metres from the shore, and the typical postcode is about 640 metres away. A sea view here comes with sea exposure.
The shoreline management plan for this coast is to hold the line over 20, 50 and 100 years. That means the stated aim is to keep defending the current shoreline rather than let it retreat. It's a policy, not a guarantee, and not a defence that's already been built. Any maintenance or improvement depends on future funding decisions.
The nearest tide gauge, at Dover, recorded sea level rising by about 2.2 millimetres a year between 1961 and 2010. That's a measured historic rate over those years, not a forecast. Past rates don't set a ceiling for future ones.
Flood risk is Deal's weakest point. Most of the town is fine, but the risk is real enough near the front that every buyer should check the individual address rather than assume the whole town is safe.