Mostly no, and for a stubborn minority of postcodes, yes. The river and sea mapping leaves almost all of the village alone. The combined indicators, which fold in water that never came from a river, are less relaxed. Nothing here is recorded as having flooded. Chacewater's water problem, where it exists, is about where the rain goes rather than where the river is.
On rivers and the sea, the Environment Agency puts about 5% of the area's postcodes in flood zone 3, the highest-probability band, and about 5% in flood zone 2, the medium-probability fringe that sits beyond zone 3 rather than including it. The other roughly nine in ten postcodes are outside both. For a Cornish village strung along a valley, that is a better result than the geography suggests.
Surface water is the awkward one, because no standalone surface-water figure exists for the village on its own. It appears folded into the combined postcode indicators, which is why those numbers run so much higher than the river and sea zones do. Anyone buying a property at the bottom of a slope should be asking about drainage and run-off specifically, not accepting a clean flood zone as the end of the conversation.
Looking forward, the Environment Agency's climate-adjusted extent covers about 13% of postcodes, up from the 5% in zone 3 today. That is the mapping's allowance for a wetter future rather than a prediction about any particular house, but it is the version a buyer holding a property for twenty years should be looking at.
For insurance, a clean flood zone usually means a quiet quote and a house inside the high-risk share usually does not. The practical move is to get an indicative buildings quote for the exact address before instructing a solicitor, because the premium is where the risk becomes a number you actually pay.
Across all indicators combined, including surface water, about 28% of postcodes carry a high rating on at least one measure, around 36% a medium rating and around 41% a low one. Those bands overlap with the zone figures rather than adding to them, and a postcode can land in the high group on a measure that has nothing to do with the river. It is a screening tool, not a verdict on a house.
Counted as homes rather than postcodes, the Environment Agency's rivers-and-sea mapping identifies 142 properties in the postcodes that carry any risk at all: 8 at high risk, 9 at medium and 15 at low, with 4 of the high-risk ones residential. Only 8 postcodes appear in that mapping in the first place, because postcodes with no risk do not feature. Eight high-risk properties in a village of this size is a specific, findable problem rather than a general condition.
On whether anything stands between the water and the house, about 5% of postcodes sit inside the high-probability extent with a defence present in the model, and about 5% sit inside it with none. Roughly 10% fall in the low-probability undefended extent. Defended means a defence exists in the modelling, not that the property is protected, and it is not a reason to skip the survey.
Every postcode here falls under a shoreline management plan, and the stated policy across the twenty, fifty and hundred year horizons is managed realignment, meaning the intention is to let the coastline move in a controlled way rather than to hold the existing line indefinitely. It is a statement of intent about a coast that sits around 4.5 kilometres away at the nearest point, not a defence already built and not a promise to anybody's house.
At the nearest tide gauge, at Devonport, the measured rise over the 1962 to 2015 record works out at about 2.35 millimetres a year. That is a historic rate from a long record, not a forecast, and it is the context in which the managed realignment policy was written.
No flooding is recorded in the area's history. That is genuine reassurance and it is not proof of anything: recorded means somebody logged it, and older or smaller events in a small village do not always make the record.
The flood picture is the weaker part of Chacewater's case, mostly because of how many postcodes trip a high rating on the combined indicators rather than because the river is a threat. Get the address checked individually, because the difference between the safe nine in ten and the exposed handful is a street, not a village.