Yes, and the risk comes from rain more than from rivers. Hardly any of the town is in a river flood zone. Most postcodes still carry a high rating on at least one flood measure. Water with nowhere to drain is the reason. A buyer reassured by the river maps has only read half the forecast.
In the Environment Agency's river-and-sea flood zones, about 1% of Baldock's postcodes fall in Zone 2 and none fall in Zone 3. The two bands don't overlap. Zone 3 is the highest-probability land beside the water, and Zone 2 is the medium-probability fringe beyond it, so a small Zone 2 with an empty Zone 3 describes a town the river mostly leaves alone. The River Ivel starts from springs inside Baldock, and a river is at its smallest where it starts.
Surface water is a different matter. About 84% of the town's postcodes are rated high on at least one flood measure, and with the river zones almost empty, rain running off roofs and roads is the likeliest explanation. A surface-water flood can come up in a dip in the road during an hour of heavy rain and be gone by morning. That leaves a carpet to replace and little else to show it happened.
The Environment Agency's climate-adjusted mapping widens the river zone to about 2% of postcodes. That projection shows how the modelled zone might grow under a changing climate, and it stays small.
Insurers price individual addresses, and they look at surface water as well as the river. A low river risk will reassure an underwriter less than it reassures a buyer. Because the ratings change from postcode to postcode across the town, an indicative insurance quote on the exact address is the most useful early check here.
At postcode level, about 84% of Baldock's postcodes rate high on at least one measure, 52% rate medium on at least one, and 64% rate low on at least one. Each figure counts a postcode if any one of several measures puts it in that band, with surface water sitting alongside rivers and sea, so the same postcode can show up under more than one heading. The three shares describe different bands and shouldn't be added together.
In the Environment Agency's modelled flood extents, the high-risk share is under 1% of postcodes both with defences and without them. In other words, there is very little high-probability river flooding to defend against in the first place. Where the model marks a defence as present, that only means the defence is drawn on the map. It doesn't mean the house behind it stays dry.
The nearest tide gauge to Baldock is at Portsmouth. Between 1962 and 2023 it recorded sea level rising by about 2 millimetres a year. That gives a fair idea of how far the coast is from this town's flooding problems.
The Environment Agency's historic records show no recorded flooding within the area. That is reassuring, and it is also a record of what was written down, which isn't always everything that happened.
Flood risk is a weak point for Baldock. The river barely counts, but on the measure that includes rain, most of the town comes out high, and that is the measure insurers use.