Forest Gate has a moderate flood risk, and all of it comes from rain. No postcodes are in the river-and-sea flood zones. There is no recorded history of flooding. Even so, about one postcode in nine is high risk on at least one measure that includes surface water. Rivers and the sea are not the problem here. Drains that can't keep up with heavy rain are.
The Environment Agency puts none of Forest Gate's postcodes in flood zone 3, the highest-probability band for river and sea flooding, and none in flood zone 2, the medium-probability fringe beyond it. A listing that says the property is outside the flood zones is telling the truth, but it is answering a question about rivers and the sea, and that is not where Forest Gate's water comes from.
Surface water is where the risk comes from, and in Forest Gate it is a question of density. About 18,000 people live in each square kilometre, in streets of terraces packed close together, where rain falls mostly on roofs, roads and paved front gardens, and very little of it has soil to soak into. The water collects in whichever street sits lowest and stays until the drains can take it. The river zones have nothing to say about this.
The Environment Agency's climate-adjusted flood zones also cover none of Forest Gate's postcodes, so the river-and-sea picture stays clear even after allowing for a wetter future. Those climate zones only deal with rivers and the sea, and they leave rain out.
For insurance, the river-and-sea picture helps, and the surface-water flags are what an insurer will look at. Premiums are set on the specific address, so two terraces on the same street can be quoted differently if one is in a dip. Put the exact address into the Environment Agency's long-term flood risk service and look at the surface water layer as well as the river one.
Postcode by postcode, about 11% of Forest Gate's postcodes rate high on at least one of several flood measures, about 26% rate medium and about 68% rate low. Surface water counts towards those shares as well as rivers and the sea, and a postcode is placed in a band if any one of the measures puts it there. Since none of these postcodes is in a river or sea zone, the high and medium flags are coming from the other measures.
The Environment Agency's modelled flood extents put none of Forest Gate's postcodes in the high-risk extent with defences present, and none without them. There is nothing to defend against in that model, so neither the reassurance nor the worry about defences applies here. In the modelling, "defended" only ever means a defence exists. Nobody should read it as a promise.
The nearest tide gauge with a long record is at Portsmouth, where sea level rose by about 2 millimetres a year between 1962 and 2023. That is the rate measured at Portsmouth over those years. For a buyer in Forest Gate, the main point is that the sea is a long way from these streets.
No flooding is on record for Forest Gate. That counts in its favour, though it only means nothing has been recorded, and a heavy summer storm on hard ground does not always make the record.
Forest Gate's flood risk is middling. The rivers and the sea leave it alone, but a good share of its streets have to cope with heavy rain that has nowhere to soak away.