Yes. South Woodham Ferrers was built beside a tidal river, and a real share of the town is at risk of flooding. About one postcode in eight is in the highest-risk river-and-sea zone. Allowing for climate change, about a third are. Close to half are within a short walk of the coast. Much of the town is at low risk, but the risk at the riverside end is high enough to change how you buy a house there.
The Environment Agency's river-and-sea mapping puts 12% of the town's postcodes in Flood Zone 3, where the yearly chance of flooding is highest, and another 3% in Flood Zone 2, the medium-probability band just outside Zone 3. The two zones don't overlap, so together they cover a little under a sixth of the town. In this town, the water in those zones would come up the River Crouch from the sea.
The flood zones cover rivers and the sea only. They say nothing about heavy rain that has nowhere to drain. The Environment Agency maps that surface-water risk separately, and it is included in the postcode measure further down this page.
The Environment Agency also models a version of the flood zones that allows for climate change, and 33% of the town's postcodes fall inside it. That is the agency's estimate of where future flood zones are likely to reach as sea levels rise, and the climate version reaches much further into the town than today's zones do.
Insurers price cover by the individual address. A home in Flood Zone 3 near the Crouch can cost more to insure, or need a specialist insurer, while a house a few streets inland may be priced normally. The best single check is a written insurance quote for the exact address early in the purchase, while you can still walk away cheaply.
Counting every measure the Environment Agency publishes, including surface water, 23% of the town's postcodes carry a high risk on at least one of them, 24% a medium risk and 54% a low risk. One postcode can show up in more than one band, so these shares add up to more than the whole town, and the measure is broader than the flood zones described above.
Counting properties gives a sharper picture. On the agency's rivers-and-sea assessment, 37 properties in the town are at high risk, 2 at medium risk, 30 at low risk and 538 at very low risk. Only 3 of the high-risk properties are homes. Those counts come from the 53 postcodes that carry some river or sea risk, which hold 1,453 properties in total. Every other postcode is left out of the list.
The defences matter here. In the agency's modelling, 7% of the town's postcodes fall inside the high-probability flood extent with no defence included, and 1% fall inside it with a defence included. "Defended" means a defence such as a sea wall is included in the model. It does not mean the defence will hold in every storm. Any sales particulars describing a riverside house as "defended" are quoting a modelling term, which is different from a promise the house is safe.
The water is close. Some 45% of the town's postcodes are within 500 metres of the coast, the closest is 26 metres from it, and the median postcode is about 540 metres away. The Environment Agency has five recorded floods here, and the most recent came from the sea in February 1953. For a town that took shape around a railway station on farmland, its creekside streets are closer to the water than most buyers would expect.
The shoreline management plan for this stretch of coast is to hold the line, meaning keep the existing defences where they are, at 20, 50 and 100 years ahead. That is a stated aim for each of those periods, and the money to deliver it has not been committed. The plan sets out what is meant to happen. It does not describe the defences standing today, and it cannot say whether they will be paid for when the time comes.
Flood risk is South Woodham Ferrers' main weakness. Inland streets are mostly fine, but the waterside end carries real risk, and the climate-change mapping pushes that risk further into the town.