Yes, near the river. Most of Rochester sits above the Medway, but a band of homes close to the water sits right in its path. About one postcode in six rates high risk on at least one flood measure. Some homes sit behind modelled defences and some sit in the open. The water's edge is close for a third of the town. The flood risk here depends on the address, and the listing won't tell you which kind you're viewing.
For river and sea flooding, the Environment Agency's mapping puts about 6% of the area's postcodes in Flood Zone 3, the highest-probability band. Another 4% fall in Flood Zone 2, the medium-probability band beyond it. The two zones don't overlap. Zone 2 is the outer fringe, not a larger area containing Zone 3.
There is no separate surface-water figure for Rochester, so surface water appears only inside the combined postcode measure further down. A home outside the river zones can still flood when drains overflow in a downpour. For the specific house you want, check the surface-water map as well as the river map.
With the Environment Agency's allowance for climate change added, the share of postcodes inside the flood zones rises to about 18%. That is a modelled future, not a forecast for any one address. For a buyer on a long mortgage, it is the most useful figure on this page.
Insurance for a home in Zone 3, or one that has flooded before, may cost more and come with a bigger excess. Some insurers may decline it altogether. Get a quote for the exact address before you instruct a solicitor, not after exchange.
Counting every type of flooding, surface water included, about 16% of postcodes rate high on at least one measure, 14% medium and 30% low. These bands overlap with the flood-zone shares above, so don't add the two sets of figures together. A postcode can appear in both.
In homes rather than postcodes, the Environment Agency's river-and-sea mapping counts about 1,260 properties at high risk, 138 at medium risk, 790 at low risk and 120 at very low risk. That is out of about 3,140 properties in the 149 postcodes that carry any risk at all. About 900 of the high-risk properties are homes rather than businesses. A postcode with no risk isn't listed, so these counts cover only the exposed parts of town.
About 6% of postcodes fall inside the high-probability flood extent with no defence in the model, and about 5% sit inside it with a defence in the model. A defence in the model means a wall or embankment is included in the calculation. It does not mean the house is safe. Defences can be overtopped, and some wait years for repair.
About 33% of postcodes lie within 500 metres of the tidal shoreline, the threshold this measure uses. The closest is 14 metres from the water and the median is roughly 790 metres. That describes the town as a whole, not any particular front door.
The shoreline management plan's most common policy for this stretch is hold the line, over the next 20, 50 and 100 years. That is a stated intention to keep defences where they are. It is not a guarantee, it is not funded forever, and it is not a wall that exists today. A council plan is a plan, and a plan doesn't keep the water out on its own.
The nearest tide gauge, at Dover, recorded sea level rising at about 2 millimetres a year between 1961 and 2010. That is a measured rate for those years, not a prediction.
No flooding is recorded in the area's historic flood outlines. That is some reassurance, but a place with no recorded flood hasn't necessarily stayed dry. It may mean nobody wrote the flood down.
Flood risk is Rochester's weak spot, and near the river it is a serious one. Uphill, most buyers can relax. On the riverside, get the searches done before you set your heart on anything.