Unaware, Uninsured, Underwater

England is about to get wet, and a third of the people in the way do not know it.

That is the blunt finding the Environment Agency put out on 30 September. Of the six million properties in England at risk of flooding, the people in roughly a third do not think they are. On the Agency’s own fuller count, about 6.3 million homes and businesses sit in areas exposed to rivers, the sea or surface water, and around 11.3 million people live in them. Caroline Douglass, the Agency’s director for flood and coastal risk, put the awareness gap without ornament: a third of those at risk do not believe they are. More than two million people, on the Guardian’s reading of the same warning, are about to meet a wet and windy three months without having registered the threat.

The Met Office has raised the odds, not issued a prophecy. Its three-month outlook for October to December puts the chance of a wet period overall at about twice the normal rate, with windier and milder conditions also more likely than usual. Will Lang, the chief meteorologist, called it a subtle shift in the odds, not a guarantee, and said the shift still produces a heightened potential for flooding. El Niño is part of the story. A record-strength event is peaking in the tropical Pacific and, historically, tends to tilt the UK and northern Europe toward warmer, wetter, stormier late autumns and early winters. The Met Office is careful to say it is one driver among several. Seasonal forecasts cannot name the town or the week. They can say the background risk has moved.

The timing is awkward in a way that is becoming familiar. Summer 2026 was provisionally the hottest on record for the UK, with a mean temperature of 16.5°C, and one of the driest for England. Drought was declared across half the country. Reservoirs have not recovered. The Agency’s own warning contains both halves of the contradiction: flooding is more likely in the months ahead, and large parts of the country will remain in drought until winter rainfall runs above average for long enough to refill storage. A nation can be short of water and drowning in the same season. That is not a paradox. It is what a warmer atmosphere does. It holds more moisture, delivers it in shorter, heavier bursts, and leaves the ground either baked or saturated, rarely in between.

The risk most people miss is not the river. Of the 6.3 million properties, about 4.6 million are exposed to surface water, the flooding that happens when drains are overwhelmed and rain has nowhere to go. That figure is 43 per cent higher than the Agency’s previous assessment, mostly because the modelling got better, not because the map was redrawn overnight. Surface water does not announce itself with a rising gauge on a familiar bend. It arrives in a street that has never flooded, in a hollow behind a new estate, in a basement whose owner was told the postcode was fine. It is also the risk that tracks deprivation most closely. The Agency’s analysis this year found that more than 2.5 million people in flood-prone areas also live in the most deprived fifth of neighbourhoods, and that nearly one in four of those exposed to surface water flooding are in the country’s most disadvantaged urban places. Coastal communities are sharper still: about a third of people in coastal flood-risk areas are in the most deprived places. The household least able to move the boiler upstairs is often the household that has never been told the boiler is in the way.

Awareness has been called dangerously low before. The House of Commons Environmental Audit Committee, in its report on flood resilience, said too many people do not know the risk, do not know how to answer a warning, and do not know who is responsible for the drain, the culvert or the wall. More than a decade after reform, accountability is still diffuse: the Agency, lead local flood authorities, water companies, highways authorities, riparian owners. When everyone owns a piece of the system, the resident owns the surprise. The Committee put the cost of physical flood damage on a path from about £2.4 billion to £3.6 billion a year by 2050. That is the invoice for not closing the gap between the map and the household.

The government’s defence programme is not imaginary. Since 2024 it has put £2.65 billion into repairs and new schemes, and says 61,898 properties were better protected across 2024/25 and 2025/26, nearly 10,000 above a two-year target of 52,000. A longer programme of at least £10.5 billion to 2036 is meant to benefit something in the order of 840,000 to 900,000 properties, with a fifth of future investment reserved for the most deprived communities and simpler funding rules for smaller schemes from April 2026. Those are real walls and real embankments. They are also a fraction of the stock already exposed, and the Agency’s climate assessment still has the total rising toward eight million properties, about one in four, by mid-century. Protection of the already-built is running behind the growth of the risk.

The sharper failure is the homes that are not built yet.

Aviva’s analysis found that one in nine homes completed in England between 2022 and 2024 stood in areas of medium or high flood risk, up from about one in thirteen in the decade before. If that rate holds, the insurer’s chief executive, Dame Amanda Blanc, expects roughly another 115,000 homes in flood zones over the next decade, on top of about 110,000 already put up in such areas in the past ten years. She told the BBC it does not make sense, and that England is, for sure, building homes that may become uninsurable. The government has disputed parts of the framing, arguing that some figures do not credit existing defences such as the Thames Barrier, and that the large majority of planning applications comply with Agency advice. Compliance with advice is not the same as staying off the floodplain. A High Court decision in September allowing up to 190 homes at Rectory Farm in Yatton, on land in flood zone 3a, showed how little weight the sequential test can carry once a scheme is in front of a judge. Neighbours say insurers have already started turning people away.

The insurance architecture was built to stop exactly this. Flood Re, the industry scheme that keeps cover affordable in high-risk areas, excludes any home built on or after 1 January 2009, on purpose, so that a public backstop would not subsidise new building in the wet. The scheme itself is due to close in 2039, after which pricing is meant to reflect risk in full. A mortgage taken out this autumn runs well past that date. A buyer of a post-2009 house in a medium-risk street has no Flood Re safety net now and no promise of one later. The planning system and the insurance system are having two different conversations about the same field.

None of this is an argument against the practical steps Douglass asked for this week. People should check the government flood map, sign up for warnings, and keep a plan that gets documents, medicines and a torch above the waterline. An emergency kit is not a policy, but its absence is how a manageable flood becomes a ruined week. The Agency is also preparing wider use of phone alerts and has stood up a national operations centre for round-the-clock coordination. Those are the right tools for a season whose odds have shifted.

They are not a substitute for the slower decisions. Surface water needs the same seriousness as river walls, which means drains, permeable streets, and a refusal to pave every last garden. Deprived neighbourhoods need protection sequenced by exposure, not by the ease of assembling a partnership funding bid. The 1.5 million homes ministers have pledged should be built where the sequential test still means something, because a home outside Flood Re is a private risk transferred to a buyer who was shown a brochure, not a flood map. And the awareness gap is itself a delivery failure: if a third of the people on the Agency’s own register do not know they are on it, the register is not yet a public service.

El Niño will peak and fade. The map will not. England can spend the next three months hoping the subtle shift in the odds does not resolve into a named storm over a street that has never flooded, or it can treat the two million who do not know they are exposed as the central fact of the season. The weather is the part nobody controls. The not-knowing is a choice.