Low Water Pressure in Greenwich
Low pressure has four common causes: a leaking supply pipe, a shared or undersized old supply, something internal like a stuck stop valve, or the company's network itself. A few checks tell you which.
Narrow it down
- Ask a neighbour — if theirs is low too, it is likely the network: report it to the supplier
- Check the internal stopcock is fully open
- One poor outlet only means an internal fitting, not the supply
- Low everywhere, neighbours fine, meter creeping with everything off — that is a supply pipe leak
The old shared-supply problem
Many older terraces share one small supply pipe between several homes. If pressure drops when next door runs a tap, a new dedicated supply pipe is the real fix — a common, well-understood job.
The numbers that matter
Companies must deliver roughly 1 bar at the boundary — enough to fill a 4.5-litre jug in under 30 seconds. What your taps feel is flow under demand, which an old, narrow or shared pipe restricts even when static pressure looks fine. Combi boilers show the problem first: most need at least 1–1.5 bar flowing to work properly.
Fixes ranked by cost
Cheapest first: fully open the internal stopcock and any external meter valve; descale tap aerators and the shower head; check any pressure-reducing valve hasn’t been wound down. Next step: a leak test. The structural fix is a new dedicated supply pipe. And one thing that is not a fix: you cannot legally pump straight off the main — boosting needs a break tank feeding the pump, which is a significant piece of work.
When the network is the problem, not your pipe
Sometimes the whole street is affected: demand peaks, a pumping issue, works nearby. Persistent cases have a formal route — companies keep a register of properties below the guaranteed standard, and sustained failures can trigger fixed compensation payments under the guaranteed standards rules. So before spending on your own pipe, do the neighbour test: if next door’s pressure died the same week yours did, report it and ask directly whether your property qualifies for the low-pressure register. Network problems are fixed by the company, not by spending on your own plumbing.
Get quotes for low water pressure in Greenwich
Local water facts for Greenwich
Water supply: Thames Water · www.thameswater.co.uk · 0800 316 9800
Wastewater & sewers: Thames Water
Postcode districts covered: SE10
Water hardness: Hard (High limescale risk). Scale from hard water builds up inside supply pipework and appliances over time, which is worth knowing when repairing or replacing pipe.
Most properties in Greenwich are supplied by Thames Water, although this can vary by postcode. Water hardness in Greenwich is typically Hard (High limescale risk). Common local postcode districts include SE10 and nearby districts.
Who owns which pipe in Greenwich: the supply pipe from the boundary stopcock into the property belongs to the property owner; the water main in the road and the communication pipe up to the boundary belong to Thames Water. Contractors on WaterTrust handle the private side — for a fault on the company's side, report it to Thames Water instead of paying anyone.
Common questions
What pressure am I entitled to?
Companies must supply enough pressure to serve the property — as a rule of thumb, filling a 4.5 litre jug from the kitchen cold tap should take under 30 seconds.
Can a leak cause low pressure without visible water?
Easily — supply pipe leaks soak away underground for months. The meter test with everything off is the giveaway.
Who pays if it's the supply pipe?
The pipe from the boundary to the house is the owner's. Some companies help with a first-time repair or offer allowances — ask yours, using the details below.
Pressure or flow — which is my problem?
Strong first burst that dies when a second tap opens = flow, usually the pipe. Weak always, everywhere = pressure, sometimes the network. The distinction points the fix.
Can I just fit a booster pump?
Not directly on the mains — the regulations cap what you may draw by pump. A break tank plus pump is the compliant route, and by then a new supply pipe often beats it on cost and simplicity.
Who is responsible for this work in Greenwich?
The supply pipe from the boundary stopcock into the property belongs to the property owner; the water main in the road and the communication pipe up to the boundary belong to Thames Water. Contractors on WaterTrust handle the private side — for a fault on the company's side, report it to Thames Water instead of paying anyone.
How do quotes work on WaterTrust?
You post the job once, free, with no account needed. Up to 4 vetted contractors covering Greenwich and the wider SE10 area contact you with quotes — you are never charged. You deal with the contractor directly — WaterTrust makes the introduction; it never resells or subcontracts your job.
Ready to get quotes?
Post the job free in about a minute. Up to 4 vetted contractors reply with quotes — no obligation.
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