Water Leak Detection Services in Bellevue, WA
A rising utility bill or unexplained wet spot can be stressful when there is no obvious pipe break to repair. We serve Bellevue with specialized equipment for residential, commercial, slab, and underground leak locating.
Some leaks cooperate - you hear it, see the moisture, fix it. Others don't: a supply line that reads clean to the meter, a slab with a warm spot but no clear signal, a water bill climbing with nothing visible inside the house. These are the jobs that need a dedicated locate, not exploratory demolition.
Simply Leak Detection serves plumbing companies and homeowners throughout Western Washington as the region's specialist locate team. Acoustic correlators, ground microphones, thermal cameras, and tracer gas - we arrive with the tools and experience to find what isn't cooperating and mark it precisely so the repair crew goes in once, not three times.
We don't repair leaks. That keeps the scope clean: we locate, we document, we hand off. Plumbers across Western Washington refer clients to us for exactly that reason - no competing scope, no overlap, just a precise location and a written summary included with every invoice.
Signs you might have a hidden leak
We're most often called in when a plumber has already looked and can't find it - but if you're experiencing any of the following, you don't need to wait that long.
Unexplained spike in your water bill
If your bill jumped without a change in usage habits, water is going somewhere it shouldn't - possibly underground or inside a wall.
Water meter moving when everything is off
Turn off every fixture and appliance, then watch your meter. Any movement - even a slow crawl - confirms water is actively leaving the system somewhere.
Soggy yard patches or zones that stay wet
Sections of lawn or landscaping that are consistently wetter than the rest - especially when the irrigation hasn't recently run - often point to a buried line failure.
Well pump running excessively
If you notice your well pump frequently cycling on (by hearing it, seeing an indicator light, or noticing a high electric bill) when no water is in use, you may have a leak.
Low or inconsistent water pressure
A supply line losing water before it reaches your fixtures will often show up first as pressure that drops or fluctuates for no clear reason.
Sound of running water with nothing on
Hissing, trickling, or rushing water sounds when every tap and appliance is off is a classic indicator of a pressurized leak somewhere in the system.
Warm or hot spots on your floors
A hot-water supply line failing beneath a concrete slab radiates heat upward. Warm patches on tile or hardwood floors are a common early sign of a slab leak.
Wet patches on walls, ceilings, or floors
Moisture that appears without an obvious source - no recent rain, no spill - usually means water is migrating from a hidden pipe failure nearby.
Musty smell, mold, or mildew without a visible cause
Persistent musty odors or mold growth in an area that never gets wet from normal use often traces back to a slow, long-running leak behind or beneath the surface.
Foundation cracks, settling, or uneven floors
Long-running slab leaks erode the soil beneath a foundation. New cracks in concrete or drywall, doors that stick, or floors that feel uneven can all follow from that movement.
Rotten egg or sulfur smell in your house
That distinct sulfur odor is added to natural gas specifically so you'll notice it. A smell near a gas line, appliance, or in your house warrants immediate investigation.
Your plumber said to call a leak detection specialist
Plumbers refer to us when a leak won't reveal itself to standard diagnostics. If yours suggested a specialist, that's exactly what we do.
Services We Offer in Bellevue
From residential slab leaks to commercial irrigation systems, we locate water leaks and leaks on privately owned gas lines downstream of the meter using non-invasive equipment.
Locate buried supply-line leaks without trenching your yard, driveway, or landscaping.
Learn more →Find hidden leaks inside walls, floors, and under slabs - no exploratory demolition.
Learn more →Pinpoint sprinkler and irrigation mainline leaks without disturbing your landscape.
Learn more →Acoustic and thermal pinpointing under concrete - no guesswork, no unnecessary jackhammering.
Learn more →Precision leak detection for offices, retail, and industrial buildings with minimal tenant disruption.
Learn more →Identify the source unit and line quickly to contain damage and resolve disputes.
Learn more →Locate leaks in fire suppression systems without compromising building life-safety systems.
Learn more →Find leaks in large-diameter water mains and underground distribution lines.
Learn more →Locate non-metallic poly and PEX pipe routes acoustically when tracer wire is unavailable.
Learn more →Locate buried utilities before digging to avoid costly and dangerous strikes.
Learn more →Pinpoint electrical ground faults in underground conduit and direct-bury systems.
Learn more →Locate leaks on privately owned gas lines downstream of the meter, typically within a home.
Learn more →We find it. Your plumber fixes it. No overlap.
- ✓Same-day written summary of findings with photos, included with every invoice, for your repair contractor
- ✓No-dig approach keeps landscaping, driveways, and hardscape intact until the actual repair
- ✓We don't repair leaks - so we have no incentive to misidentify a problem or overscope the job
- ✓The plumbers who know leak detection best are the ones who send us their toughest calls
Three steps. No guessing.
Call or schedule online
Tell us what you're seeing - bill spikes, wet spots, meter movement. We gather details so we arrive prepared.
Non-invasive inspection
Acoustic sensors, thermal imaging, and tracer gas where needed. No jackhammers. No unnecessary openings. No guesswork.
Written summary with exact location
Precise location and photos in a summary of findings included with every invoice.
Underground & Irrigation Leak Detection
A buried water line doesn't announce itself. Whether it's the service line running from the meter to your foundation, a mainline crossing the property, or an irrigation zone that hasn't shown up on a bill yet, underground leaks share one inconvenient trait: they run quietly until the damage is visible or the water loss becomes impossible to ignore. Our underground leak detection work covers all of it - from city-side service connections through to the sprinkler manifold at the back of the yard. See our underground leak detection and irrigation leak detection service pages for more detail.
Irrigation and sprinkler systems are among the most commonly overlooked underground leak sources because the affected zones aren't under constant observation. A cracked mainline between the backflow preventer and the valve manifold can run continuously - not just during irrigation cycles - adding thousands of gallons of loss before a water bill flags it. Signs include zones that stay wet between cycles, a controller that cycles normally but loses pressure at the heads, or a meter that keeps moving when everything is supposed to be off.
Underground water pipe leaks are located primarily through acoustics; we typically also use a safe nitrogen/hydrogen tracer-gas blend as additional confirmation of the leak location. We mark the exact leak point, typically within a foot, so the repair is a targeted dig rather than a trench across the lawn. Your landscaping stays intact until the repair contractor needs to open it, and only where they need to.
Slab Leak Detection & Foundation Leak Locating
A slab leak - a break or pinhole failure in a supply or drain line embedded in or running beneath your concrete foundation - is one of the more stressful water problems a homeowner can face. The water often appears far from the source, migrating along the path of least resistance until it surfaces under flooring, at a baseboard, or on the wall opposite the actual pipe. Combining years of experience with high-end equipment including acoustic sensors, thermal cameras, utility locators, and more - we are able to zero in on the exact location of the leak.
Hot-water supply lines are the most common slab leak culprit. They expand and contract with every cycle, and over years that movement creates friction wear against the concrete that eventually opens a pinhole. Post-tension slabs - common in Western Washington construction from the 1980s onward - add complexity because the reinforcing cables have to be respected during any repair planning. We document the position so the repair crew can work from a clear, precise target.
The same non-invasive detection process extends to residential plumbing throughout the home - in-wall supply lines, under-tile hot-water runs, and leaks that present above grade but originate below it. Whether the source is above the slab or beneath it, we locate it without guesswork.
If you are planning an upcoming project requiring excavation on your property, we also provide underground private utility locating before any ground is broken - which prevents costly and dangerous strikes on existing infrastructure.
The non-invasive approach we apply to water leaks extends to private utility locating as well. Every private utility locate ends with documented findings - exact location and pipe material where known - so the team doing the repair or the excavation has a clear, professional record to work from.
Common questions from Bellevue customers
Almost certainly, yes. Many water leaks - especially underground supply-line leaks and slab leaks - produce no visible wet spot at the surface, or the water emerges far from the actual break. A water bill that climbs without a change in usage, or a meter that keeps spinning when every fixture is off, are more reliable early indicators than visible moisture.
Turn off every water fixture inside and outside the house, including ice makers, humidifiers, and automatic appliances. Note the meter reading, wait 15–30 minutes without using any water, then check it again. If the meter has moved, water is escaping somewhere in your system. That's a good time to call us.
No. Our detection equipment - acoustic sensors, thermal cameras, and tracer gas probes - works entirely from the surface. We don't cut, core, or excavate anything during the locate. The only thing that gets opened is what your plumber opens to make the repair, and because we've marked the exact spot, that opening is as small as possible.
Every invoice includes a written summary of findings with photos showing the exact location. You take that summary to your plumber, who can schedule and price the repair accurately. We don't do repairs ourselves - which means we have no incentive to overstate the problem or expand the scope.
We provide clear pricing before any work begins - no surprise fees. Detection costs vary based on property type and leak complexity, but the investment is typically a fraction of what a missed or misidentified leak would add to the repair bill. Call us for a specific quote.
Have a question we didn't answer?
Have a leak? We'll find exactly where it is.
Non-invasive leak detection for homes and businesses in Bellevue and across Western Washington. Written summary of findings and exact location - same day.