Stansted Mountfitchet has some flood risk, and most of it comes from rain. Only a few postcodes are in the river flood zones. About one in twelve are at high risk on at least one measure once surface water is included. The river last overflowed into the record books a generation ago. On a flood map the village looks fine, and the risk shows up on wet nights.
The Environment Agency's river-and-sea mapping puts about 2% of the village's postcodes in Flood Zone 3, the highest-probability band, and about another 3% in Flood Zone 2, the medium-probability fringe beyond it. The two bands don't overlap, which is why the outer one can be the larger. The agency has four recorded flood events here. The most recent was in October 2001, when a main river carried more water than its channel could hold and there were no raised defences to stop it. A quarter of a century without another entry in the records tells you nobody has written one down since. It doesn't tell you the river has calmed down.
Surface water is different. Rain that can't drain away can pool in places nowhere near a river, so the zones above miss it entirely. "Outside the flood zone" on a set of property particulars refers to rivers and the sea. It says nothing about what a downpour does to a road with blocked drains.
Looking ahead, the Environment Agency's climate-adjusted mapping puts about 6% of postcodes in the flood zones once future rainfall and river flows are allowed for. That's the agency's planning assumption, and the planners use it whether or not any buyer reads it.
For insurance, the small share of homes inside the river zones may find cover costs more or comes with conditions, and a home with a past claim on it will notice that at renewal. Get a buildings insurance quote for the exact address early on, while walking away is still cheap. An insurer's view of the address is the most practical reading of the risk available.
The broader postcode measure counts a postcode if it is at risk on any of several flood measures, surface water included. On that basis about 8% of the village's postcodes are rated high, about 12% medium and about 27% low on at least one of them. This measure is bound to give larger shares than the river zones alone, because it covers more ways for water to arrive.
Counting buildings gives a sharper picture. Across the 17 postcodes the Environment Agency's rivers-and-sea mapping lists as carrying some risk, there are 402 properties. Of those, 56 are at high risk, 18 at medium and 60 at low. Postcodes with no river or sea risk don't appear in that list at all. Of the 56 high-risk properties, 22 are homes. Twenty-two is small for a village of this size, but for anyone living in one of those 22 homes it is the only number that matters.
The modelled high-risk flood extent covers about 2% of postcodes with defences included and about 2% without. "Defended" here only means a defence appears in the agency's model. With the two figures this close, any defence that exists doesn't shrink the high-risk footprint, and it shouldn't be read as protection for any particular house.
Flood risk here is middling. Most of the village is untouched by it, and the risk that does exist is concentrated in a small number of homes.