Yes, Ware has a real flood risk, and it follows the River Lea through the middle of town. Roughly one postcode in five falls in the river's medium-risk fringe. About one in eight rates high on at least one flood measure. A couple of hundred properties face high risk from the river itself. Most of the town is up the slope from the problem, and the rest of it lives beside the water.
On the Environment Agency's river-and-sea flood zones, about 6% of Ware's postcodes are in Flood Zone 3, the highest-probability band, and a further 19% are in Flood Zone 2, the medium-probability fringe beyond it. The two bands do not overlap, so a postcode in Zone 2 is outside the worst of it but still on the river's map. The Domesday Book named the town Waras after the natural weirs in the Lea, so the river was in the paperwork before the residents were.
Surface water is the other route in, when heavy rain has nowhere to drain, and it can reach streets well away from the river. The Environment Agency's records hold 164 recorded flood events across the area, and about 20% of postcodes have some flooding on record. The most recent recorded event came from the main river in December 1968, when the channel overflowed in a place with no raised defences.
Looking further ahead, the Environment Agency's climate-adjusted mapping puts about 28% of postcodes inside a flood zone once future rainfall and river flows are allowed for. That is a modelled projection of how the zones could spread, and it reaches more of the town than today's map does.
Insurers price flood cover address by address, so two houses on the same road can get very different quotes depending on which side of the zone line they fall. A home in Zone 3 or with a flood history will usually pay more and face more questions, and a home on the higher ground is mostly priced like anywhere else in Hertfordshire. The one practical step is to put the exact address into the Environment Agency's long-term flood risk service and get an indicative insurance quote while there is still time to walk away.
A wider measure counts a postcode if it rates on any one of several flood indicators, surface water included alongside rivers and sea. On that basis about 13% of Ware's postcodes rate high on at least one measure, another 13% medium and 42% low. A postcode only needs one bad indicator to be counted, so this measure catches more of the town than the river zones on their own.
Counting homes instead of postcodes, the Environment Agency's rivers-and-sea mapping lists 2,361 properties across the 94 Ware postcodes that carry any risk at all. Of those, 249 are rated high risk, 291 medium, 1,075 low and 33 very low, and 188 of the high-risk properties are homes. Postcodes with no river or sea risk do not appear in that list at all, so the total is only the part of town on the river's radar.
The modelled extents also ask whether anything stands between the water and the house. About 7% of postcodes fall within the high-probability extent with no defence in the model, and about 5% where a defence is present. A defence on the model shows that something has been built. It does not show that the house behind it stays dry, and the last recorded overflow happened where there was no defence to fail. About 23% of postcodes fall within the low-probability undefended extent.
Flood risk is Ware's weak point. The higher streets are fine, but a buyer anywhere near the Lea is taking on a river that named the town and still has the last word on the valley floor.