Water Leak Detection Services in Seattle, WA
Unexplained water use deserves a closer look, especially when every fixture is off and the meter still shows activity. We serve Seattle with specialized equipment for residential, commercial, slab, and underground leak locating.
If your water bill has climbed without explanation, your meter spins when every tap is off, or there's a damp patch that never quite dries - you likely have a hidden water leak. For homeowners, that kind of problem rarely fixes itself. It runs quietly behind walls and under slabs until it becomes a repair bill instead of a maintenance call.
Simply Leak Detection finds those leaks before they find your floors. Using acoustic sensors, thermal imaging cameras, and tracer gas - not jackhammers and guesswork - we pinpoint the exact source so your plumber can fix it in one precise opening instead of three exploratory ones. No unnecessary damage, no oversized repair scope.
We serve the area and communities throughout Western Washington. Most residential inspections take one to two hours, and you receive a written summary of findings, included with every invoice, plus an exact location your repair contractor can act on the same day.
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 Seattle
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 →Licensed, insured, and earning 4.9 stars since 2010.
- ✓Washington State licensed and fully insured - UBI# 605905758
- ✓4.9-star average across 300+ verified reviews from homeowners and property managers
- ✓Clear pricing before we start - no surprises, no trip fees buried in fine print
- ✓Serving the greater Puget Sound and Western Washington for 15+ years
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.
Leak Detection Inside the Home
Leaks inside the home are often the most disruptive to find - not because the water is hard to detect once damage appears, but because knowing where it originated without opening walls is the challenge. A wet spot on a ceiling could be a supply line in the wall above, a slow drain connection, or condensation from an HVAC line. Our residential leak detection service is built to pinpoint the source before anything gets cut open.
We use acoustic listening equipment and thermal imaging to trace active leaks inside walls, under flooring, and in ceilings without exploratory demolition. The result is a precise location - not a square-foot target area - so the plumber making the repair knows exactly where to open and nothing else gets disturbed.
If the source turns out to be under the foundation rather than inside the wall, the approach shifts to slab leak detection - but the goal is the same: one location, one repair, one written summary of findings. Both services can often be confirmed or ruled out in a single visit.
For multi-family properties and HOAs, speed of identification is everything - the longer the source is unknown, the more units, common areas, and building systems are exposed to ongoing water damage. The same precision approach we bring to slab leak detection under a single-family home applies just as directly to a multi-story building with four risers and twelve units.
In both cases, accuracy at the locate stage directly controls the cost of the repair stage. An exact location means one precise opening, one targeted repair, and a written summary of findings included with every invoice that closes the insurance loop cleanly. Guesswork means multiple openings, extended timelines, and conversations nobody wants to have.
Common questions from Seattle customers
Yes. Non-invasive detection is the whole point. We use acoustic sensors, thermal cameras, and tracer gas - none of which require opening walls, shutting off water to occupied units beyond a brief pressure test, or issuing disruption notices to tenants. We schedule around operational hours when needed.
We isolate the building's water system by floor, riser, or tenant zone using valve and pressure tests, then use acoustic and thermal instruments to follow the leak signal to its source. In many cases we can narrow it to the specific floor and line segment on the first visit.
Yes, regularly. We understand that managed properties have different billing, reporting, and scheduling requirements than residential calls, and we accommodate that. We can coordinate with on-site staff, report to property management directly, and schedule in phases when the property requires it.
We try to accommodate urgency - an active, high-volume leak is a different conversation than a slow, monitored loss. Call us with the details and we'll give you a realistic scheduling window. For situations that can't wait, we make every effort to respond the same day.
Our written summary of findings, included with every invoice, documents the leak source and location with photos. Most insurance adjusters and contractors accept it as part of the claim package. In our experience, the summary provides what is needed to establish the source, scope the repair, and support the claim.
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 Seattle and across Western Washington. Written summary of findings and exact location - same day.