Signs you may have a hidden water leak

Not every damp spot is a disaster, but these clues are worth a proper check rather than another week of hoping it settles:

• Unexplained rise in your water meter or quarterly bill
• Meter still moving when all taps, cisterns and appliances are off
• Warm patches on floors (possible hot water line under the slab or in the cavity)
• Musty smells, peeling paint or bubbling plaster with no roof leak above
• Soft or cupped timber flooring, lifting vinyl or stained carpet edges
• Low pressure in one area of the house while other taps seem fine
• Hissing or trickling sounds inside walls, under floors or near the hot water system

If you have already ruled out an obvious overflowing cistern or a visible hose leak under a sink, non-invasive leak detection is the logical next step — especially in older eastern-suburb homes where pipework may sit under concrete or behind tiled wet areas.

How our leak detection works

Our approach is practical and staged. We start with the simple checks that save time, then use detection equipment where the leak is not visible.

1. Conversation and visual survey — where you first noticed damp, which fixtures are nearby, whether the issue is worse after hot water use, rain, or overnight.
2. Isolation checks — confirming whether the leak is on the mains side, a particular bathroom circuit, or the hot water line.
3. Acoustic detection — listening for the sound signature of pressurised water escaping through pipe walls, joints or pinholes, including under slabs where access is limited.
4. Thermal detection — spotting temperature differences that often show where hot (or sometimes cold) water is escaping into a cavity or floor.
5. Pinpoint and mark — we identify the likely leak zone so any opening of tiles, plaster or concrete is targeted, not speculative.

The aim is always the same: find the leak accurately so repair work is smaller, cleaner and cheaper than opening half a bathroom on a guess.

Pipes, slabs and hot water lines

Hidden leaks tend to sit in three places we see often around Athelstone and nearby suburbs such as Rostrevor and Magill.

In-wall and under-floor pipework

Copper and other pipe runs behind plaster, in vanity voids or under timber floors can develop pinhole leaks, failed joints or chafe points. Acoustic methods help us narrow the zone before any cutting begins.

Slab and under-concrete leaks

Homes on concrete slabs can hide long-running leaks that only show as warm floors, rising damp at edges or a meter that never sits still. Detection here is about locating the fault so excavation — if needed — is as small as possible.

Hot water lines and plant

Leaks on the hot side often present as warm flooring, steam in a cavity or water near the heater. If the tank or valves themselves are dripping, that may be a plant issue rather than a buried pipe — we also handle hot water system leaking assessments when the heater is the culprit.

What happens after we find the leak

Detection without repair only solves half the problem. Once we know where the water is escaping, we explain your options in plain English and quote upfront before opening anything.

• Localised pipe repair or section replacement
• Re-routing a problematic run where access or pipe condition makes that smarter
• Seal, fixture or connection repairs when the “hidden” leak was actually a failed joint nearby
• Advice on drying, flooring risk and whether other wet areas should be checked

If the leak has already burst through and is actively flooding, we prioritise isolation and may treat it as urgent burst pipe repair first, then confirm whether other weak points need attention.

Why professional detection beats guessing

Opening tiles, gyprock or concrete “where it feels damp” is expensive and often wrong. Moisture travels. A stain on a hallway wall can originate from a shower niche, a cracked waste, or a pipe two metres away. Non-invasive detection reduces unnecessary demolition, shortens the repair, and gives you a clearer repair-versus-replace decision.

It also protects indoor air quality. Long-running leaks feed mould in cavities you cannot see. Finding and stopping the water source is step one; cosmetic repairs only last if the leak is truly gone.

What you can do before we arrive

A few simple steps help us find the leak faster and protect your property while you wait for the visit during business hours.

• If safe, read your water meter, turn off all taps and appliances, wait 15–20 minutes and check whether the meter has moved
• Photograph damp patches, stained ceilings and any bubbling paint — timestamps help show whether moisture is spreading
• Avoid running dishwashers, washing machines or irrigation until we have isolated the circuit if the meter will not sit still
• Do not cut holes in tiles or plaster yourself; moisture stains are poor guides to the true source
• Keep pets and children away from wet electrical areas and lift stored goods off damp carpet where you can

If you smell mould or the damp has been present for weeks, tell us when you book. Long-running leaks change how we plan access and what we recommend after the water is stopped.

Repair options once the leak is located

Every property is different, but most hidden-leak repairs fall into a handful of practical paths. We explain which one fits your situation before tools come out.

• Local joint or fitting repair — failed couplings, olive joints or appliance connectors that looked “hidden” until isolation pointed to them
• Section replacement — cutting out a pinhole or thinned length of pipe and tying back into sound pipework
• Re-route — taking a vulnerable under-slab or inaccessible run above ground or through a cupboard where future service is easier
• Plant-side repair — valves, tempering sets or tank fittings when the heater — not the buried line — is the source

We quote the recommended path upfront. If a cheaper temporary clamp would leave you at real risk of another flood, we say so. If a full re-pipe is unnecessary for a single isolated fault, we say that too.

Leak detection across Adelaide East, North-East and West

Hidden leaks do not respect suburb boundaries. From foothills homes to western freestanding houses and units, the detection process is the same: locate accurately, minimise disruption, repair properly. Confirm coverage on our areas we serve page or call with your address.

How to book leak detection

1. If safe, note whether your water meter moves when everything is off — that detail helps us prepare.
2. We attend during business hours, detect, explain and quote the repair before major opening-up work begins.

If water is actively flooding, isolate at the meter or main shut-off if you can do so safely, then call immediately within our Mon–Fri 7:30am–5:00pm hours.

Book leak detection with Streamline Plumbing & Gas

Stop guessing where the water is going. Get accurate leak detection and a clear repair plan from a licensed, owner-operated plumber based in Athelstone.

Call 0401 916 325 for a free quote, or email [email protected].

We also serve these areas

• Leak detection in Paradise
• Leak detection in Norwood
• Rostrevor
• Magill
• All areas we serve