Yes, though not from the direction most buyers look. The river zones barely register. Roughly one postcode in six is still flagged high risk on at least one measure. There's no recorded flood on file. It's a hill town, and on a hill the water arrives down the street, not over a riverbank.
Start with rivers and the sea, because that's what most buyers check and it's where the town looks cleanest. On the Environment Agency's river-and-sea flood zones, about 1% of the area's postcodes sit in zone 2 and a fraction of 1% in zone 3. The two are separate bands: zone 3 is the higher-probability core, and zone 2 is the medium-probability fringe beyond it, not a bigger area containing it. Either way, the Medway's tributaries don't reach far into the town.
Surface water is a different matter. Tunbridge Wells sits on the northern edge of the High Weald at the head of a valley running south-east to Groombridge, and the River Teise starts here. Hard sandstone, steep streets and a lot of tarmac send rain downhill fast, and it pools wherever the hill flattens out. That kind of flooding doesn't show up on the river maps, which is exactly why the buyer who only checked the river maps gets surprised.
Looking ahead, the Environment Agency's climate-adjusted flood zone takes in about 2% of postcodes, against the 1% or so in today's zones. It's a small shift, and it only covers rivers and the sea.
Insurers price the specific address, not the town's reputation, and surface-water risk gets priced like any other kind. A house on a street with a flag against it can cost noticeably more to cover than one two roads away, so get an indicative quote before instructing a solicitor, not after the survey.
The postcode indicators fold every source together, surface water included. On at least one measure, about 16% of postcodes rate high, 14% medium and 31% low. Those bands overlap with the zone figures above and can't be added to them. They show a hill town with a wet streak, not a town at risk from a river.
Counted as buildings, the Environment Agency's rivers-and-sea mapping lists 635 properties across the 29 postcodes that carry any river or sea risk at all. Of those, 16 are at high risk, 42 at medium and 256 at low, and eight of the high-risk properties are homes. Postcodes carrying no river or sea risk don't appear in that count.
On whether anything stands between the water and the house, the answer is not much that changes the numbers. The same fraction of 1% of postcodes sits in the high-risk river extent whether defences are modelled or not. "Defended" only means a defence is present in the model. It's not a promise, and here it barely moves the figure either way.
At Dover, the nearest tide gauge, sea level rose by about 2 millimetres a year over the record from 1961 to 2010. That's a measured historic rate at the coast, a long way from a town with no sea to rise.
No flooding is recorded in the area. That's reassuring as far as it goes, but it means nothing's on record, not that nothing has ever happened, and surface water tends to be the kind of flood that never makes the record.
Flood risk is the town's weak spot, and the rivers aren't the reason: the danger is rain running off a ridge onto particular streets. Check the exact address, not the postcode's good name.