Swanley or Hextable Blocked Drain: Who to Call

Not the council. Swanley sits in Kent, under Sevenoaks District Council, but its public sewers belong to Thames Water, which both supplies the water and takes the sewage away in Swanley and Hextable. If the blockage is in a drain shared with neighbours or outside your boundary, report it to Thames. If the drain serves only your house and the blockage is inside your boundary, it is yours, and you call a plumber or drainage engineer. A house on a septic tank or private treatment plant is a separate case: that system is entirely the owner’s.

Why people ring the wrong number in Swanley

Because Swanley is in Kent, a lot of people assume its sewers belong to a Kent water company. They do not. The Sevenoaks District Council and Thames Water statement of common ground from 2026 records that Thames supplies clean water to Swanley and Hextable and collects their sewage, and a Kent County Council surface water report for Swanley and Hextable lists Thames as responsible for the combined, foul and surface water sewers there.

So for BR8, the sewer company is Thames Water. Sevenoaks District Council deals with planning and works with Kent County Council on flood risk strategy, but it does not clear your drain.

Whose drain is it?

Since 1 October 2011, drains that serve two or more properties, and drains serving one property that run outside its boundary, have belonged to the sewerage company. A drain that serves only your house, inside your boundary, is still yours.

Thames Water’s own rule of thumb:

• Likely yours: only your home is affected, your property does not share a drain, and there is no other flooding nearby.
• May be Thames’s: the problem is outside your boundary, or more than one property is affected.

On Swanley’s large 1950s and 1960s estates, many houses share a drain along a terrace or a row of semis before it reaches the sewer in the road. If your neighbour’s toilet is backing up too, that points to a shared section.

How do I check?

1. Stop running water in the house: no flushing, no washing machine, no showers.
2. Find your inspection chamber, the manhole cover in the garden, drive or path, and lift it carefully with gloves on.
3. If the chamber is full of water or waste, the blockage is further down, between the chamber and the sewer.
4. If the chamber is empty but your toilet or sinks will not drain, the blockage is between the house and the chamber, which is usually your own pipe.
5. Ask your neighbours whether their drains are slow, and check their chamber too if you can.
6. If the blockage is on a shared section or outside your boundary, report it to Thames Water through its website or call Thames Water on 0800 316 9800.
7. If it is clearly yours, call a plumber or drainage engineer.

If an upstairs toilet will not drain but downstairs is fine, Thames notes the blockage is probably inside the house, in the soil stack or its branch.

Is it the drain, or just the toilet?

If only one toilet or one sink is slow and everything else drains normally, the blockage is probably in that fitting’s own trap or waste, not the drain outside. A plunger, or clearing the trap under a sink, often fixes it. If two or more fittings are slow at once, or the downstairs toilet gurgles when the bath empties, the problem is further down the system, and the inspection chamber check above is the next step.

What about septic tanks and cesspits?

Not every house in BR8 is on the mains sewer. Some houses in the older village streets and out on the lanes around Swanley Village and Crockenhill have private drainage: a septic tank, a cesspit or a small treatment plant. If that is you, Thames Water has nothing to do with it. Emptying, maintenance and repairs are the owner’s responsibility, and a blockage in the pipe to the tank is too. If you are not sure, your deeds or the original survey usually say, and if you do not get a sewerage charge from Thames, that is a strong clue.

What causes most blockages here?

Thames Water’s advice is to bin anything that is not pee, poo or toilet paper, including wipes labelled “flushable”. Wipes, cotton buds and sanitary products catch in old joints, and kitchen fat sets in the pipe and binds them together. In Swanley there is an extra factor: the water is very hard, around 327 mg/l in Thames’s Swanley supply zone, and scale builds up in traps and wastes over the years, narrowing them.

Post-war clay drains on the estates are now sixty-odd years old. Roots get into joints, and pipes crack or sag. If the same drain blocks again and again, a camera survey shows why.

What if sewage is coming into the house?

Keep children and pets away, do not use any water, wear gloves, and photograph everything for your insurer before cleaning up. If the overflow is from a shared sewer, tell Thames Water at once. Our guide to whether a blocked drain in Welling is yours or Thames Water’s covers the same rules in a London borough. More about BR8 on our Swanley page.

Need a plumber now?

If your own drain is blocked or a toilet is overflowing, Call 07868 281022. Tell us your postcode, which fittings will not drain, what the inspection chamber looks like, and whether you have stopped using water. We clear blocked drains in Swanley, Hextable and Crockenhill, deal with overflowing toilets, and we agree the price with you before any work starts.