Before You Grab a Spade: Understand a ‘Constant Flow’ Alert
Late one evening your meter ticks even though everyone’s in bed — that steady movement can mean hundreds of litres lost overnight. This guide is for UK homeowners and landlords who have noticed continual meter movement and want to narrow down the cause before calling a tradesperson. In our experience, quick, methodical checks often reveal simple fixes or show when a specialist from Track A Leak is needed.
First confirm what your meter is telling you. Digital meters may show a live flow rate; analogue meters show a spinning dial or triangle. Note how it indicates use. Then make sure no taps, toilets, water softeners, cylinders, or loft tanks are filling. Contact your supplier to check for planned works or pressure changes that can cause brief backflow. Record a baseline: photograph the display, note the time and capture the flow rate. If you’re unsure who is responsible for which pipe sections, see our leak responsibility guidance.
What Most People Get Wrong
Many assume any meter movement equals a hidden burst. A common issue we see is intermittent auto-filling systems or a leaking toilet producing the same steady read as a supply pipe leak. Always isolate to pinpoint the source.
When This Doesn’t Apply
If you have metered irrigation, large tanks, or non-domestic supplies, some tests here may not work or need adjustment. Call your supplier or Track A Leak for tailored advice.
Quick Checklist
- Photograph meter at start and finish
- Run 15-minute no-use test
- Operate internal then external stop taps
- Isolate toilets, heating and appliances one at a time
- Log results and call Track A Leak if flow continues
Safety First: Find and Test Your Stop Taps
Locate the internal stop tap, often under the kitchen sink or in a utility. Gently turn it off and back on to confirm it moves; do not force a seized valve. If it feels stiff, stop and plan for a plumber to assist. If you’re in a Victorian terrace with lead pipework, treat valves cautiously and get professional help.
Find the external boundary stop tap in the pavement. Only lift lids and operate it if you’re allowed and it’s safe. Wear gloves, use a torch, and keep towels and a bowl ready for drips. For urgent control steps, see our emergency water leak guide.
Meter Test #1: The 15‑Minute No‑Use Test
Stop all water use for 15 minutes. Turn off appliances, garden systems and any top-up feeds. Photograph the meter at the start and end and note both total and flow if available. If the flow indicator still moves with strict no use, you likely have a leak. A steady, unchanging rate hints at a continuous leak; pulsing movement can indicate periodic tank or toilet top-ups.
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Isolation Test: Inside Or Supply Pipe
Turn the internal stop tap OFF and watch the meter. If it stops, the leak is inside your property. If it keeps moving with the internal stop tap OFF, the leak could be on the supply pipe or the meter side. In our experience, this check settles the inside-versus-supply question in most cases.
If permitted, turn the external stop tap OFF. If the meter still turns, contact your water supplier urgently. If it stops with the external valve, the leak lies between the boundary and your internal stop tap. For locating supply-side leaks we recommend contacting our water mains leak detection specialists.
Toilets: The No.1 Silent Culprit
Lift the cistern lid and add food colouring to the tank. If colour appears in the bowl without flushing, the flush valve is passing. Listen for hissing and check for a trickling overflow. Small toilet leaks waste surprising volumes over time. Isolate each WC one by one and rerun the meter test; if movement stops after isolating a toilet, fit a new flapper or fill valve.
Heating & Boilers: Hidden System Losses
Note your boiler/system pressure trend. If the system auto-fills, continuous topping up can appear as constant meter flow. Check for drips at the pressure relief valve and visible discharge pipes. Look for stains on ceilings below pipe runs. If meter movement stops after isolating a heating zone, focus repairs there — see our central heating leak detection service for specialist help.
Hot/Cold Pipework And Water‑Using Appliances
Turn off branch lines at under-sink/service valves to isolate kitchens, bathrooms or utility runs. Rerun the meter test after each isolation to narrow the area. Check flexible hoses and appliance connections for weeps. Inspect loft storage tanks, unvented cylinders and the tundish; a constant trickle at any relief valve wastes water and risks damage.
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External Services: Gardens, Garages And Outbuildings
Shut off outside taps, hose reels and irrigation controllers, then repeat the meter test. Check troughs, auto-fill systems and any hidden garden valves that might stick open. Walk the route from pavement stop tap to your internal valve and look for damp patches, sinkage, unusual algae or lush growth — these are common signs of underground service leaks.
Advanced Checks For Homeowners (Optional)
Run an overnight test: photograph the meter last thing and first thing, noting temperature and whether heating ran. For basic listening, place a screwdriver tip to the pipe and press the handle to your ear; a steady hiss can indicate flow. Thermal cameras can help locate buried or concealed leaks but can be fooled by insulation and reflections.
When To Call Leak Detection Specialists
Call Track A Leak if flow continues with your internal stop tap OFF, if ceilings or walls are damp without a clear source, or if heating loses pressure despite bleeding and visible checks. In our experience, non-destructive methods such as acoustic correlation, tracer gas, thermal imaging and endoscopy locate leaks quickly with minimal disruption.
Costs, Responsibility And Insurance
Responsibility usually splits at the boundary: the water company handles the main; homeowners handle the supply pipe to the property and everything inside. Confirm local policy with your supplier. Many insurers cover trace and access to find a leak that has caused damage — see our trace and access UK insurance cover page and our article on whether home insurance covers leak detection for typical exclusions and evidence tips.
Your Fast‑Action Closing Steps
Work through the tests above, keep photos, time stamps and a simple damp map. If you’ve isolated an appliance or WC as the issue, repair or replace the valve and retest. When you’re ready, share your findings with Track A Leak so we can plan efficient testing; use our contact page to book a visit or request guidance.
FAQs
How quickly should I involve Track A Leak?
If you have continuous meter movement despite isolating internal supplies, or visible damp or rising bills, contact us promptly. Early detection limits damage and repair costs.
What evidence will my insurer want?
Insurers typically ask for dated photos, meter readings, a record of isolation tests and any contractor reports. Keep all timestamps and notes from your checks to support a claim.
Can I safely operate the external stop tap myself?
Only if it is accessible, you are comfortable doing so and the cover is intact. If a valve feels seized or the street lid is unsafe, stop and call your supplier or Track A Leak.
Will leak detection damage my property?
Professional detection prioritises non-destructive methods. Where trace and access is required, work is targeted to minimise openings and reinstate finishes afterwards.
How accurate are smart meter flow readings?
Smart meters are generally reliable for indicating flow but can fail. If readings contradict isolation results, ask the supplier to verify or replace the meter and confirm the data.
Can the water company force repairs on a supply pipe?
Water companies are responsible for the main. If the leak is on the supply between the main and your property they may assist in locating or advise on next steps, but homeowners usually fund repairs to the private supply pipe.
