Slab & Underground Leak Detection in Portland, OR
Pinpoint underground and under-slab water line leaks with ultrasonic acoustics, thermal imaging, and tracer gas without unnecessary concrete jackhammering.
Answer-First Overview: Non-invasive slab leak detection and under-slab pipe repair in Portland, OR pinpoints pressurized water leaks beneath concrete foundations without tearing up finished flooring. United Plumbing PDX uses ultrasonic ground sensors, FLIR infrared thermal imaging, and nitrogen tracer gas testing to mark leak coordinates within inches, followed by surgical spot repairs or clean overhead PEX bypass reroutes.
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A slab leak occurs when the pressurized copper or galvanized water pipes running beneath your home's concrete foundation develop pinholes, cracks, or joint separations. Left undetected, escaping water erodes foundation supporting soils, creates structural slab cracking, and invites mold into living spaces.
United Plumbing PDX provides non-invasive slab and underground leak detection throughout the Portland area. We pinpoint leaks accurately before any physical work begins, saving you thousands of dollars in unnecessary flooring destruction.
What's Included in Our Slab & Underground Leak Detection
Every service call from United Plumbing PDX delivers comprehensive, code-compliant solutions backed by Oregon master plumbing standards:
Common Signs You Need Slab & Underground Leak Detection
If you are noticing any of the following warning signs, early intervention prevents costly structural water damage:
- Noticeably warm spots developing under carpeting, tile, or hardwood floors
- Sound of water hissing or running constantly beneath floors while all taps are off
- Cracks developing in interior drywall, baseboards, or foundation concrete slabs
- Sudden, massive increase in quarterly Portland Water Bureau utility bills
- Water pooling around exterior foundation edges or damp spots on concrete patios
Our 4-Step Diagnostic & Repair Process
Electronic Acoustic & Ultrasonic Sound Mapping
We use ground-penetrating acoustic sensors to listen for the high-frequency sound of pressurized water escaping through concrete.
Thermal Infrared Imaging
We scan concrete surfaces with FLIR infrared cameras to detect thermal blooming patterns created by leaking hot water supply lines.
Precision Marking & Surgical Option Review
We mark the leak coordinates within inches, then present repair options: surgical concrete breakout or non-invasive overhead PEX reroute.
Repair Execution & Hydrostatic Pressure Retest
We perform the chosen repair, restore concrete cleanly if accessed directly, and conduct a final hydrostatic test to verify zero remaining line leaks.
Why Portland Relies on United Plumbing PDX for Slab & Underground Leak Detection
We combine rapid local dispatch with transparent, upfront quotes and 14+ years of proven Pacific Northwest plumbing heritage.
OR CCB #234891 Licensed & Bonded
All technicians hold active Oregon Building Codes Division plumbing specialty licenses (#PB-9421) and adhere to 2023 OPSC codes.
Upfront Flat-Rate Written Quotes
You review and approve an itemized, transparent quote before any physical work begins—never surprise hourly invoices.
30–60 Minute Metro Response
Staged service vans dispatched from our 621 SW 5th Ave hub reach Multnomah, Washington, and Clackamas counties quickly.
184 Verified 4.9★ Reviews
100% satisfaction guarantee on all diagnostic, repair, and replacement workmanship across Portland.
Repairing Under Slab vs. Overhead PEX Rerouting
Once a slab leak is located, homeowners face two choices:
1. Direct Spot Repair: Jackhammering a small section of concrete, excavating gravel, cutting the fractured pipe, and soldering a new copper bridge.
2. Overhead Bypass Reroute: Leaving the leaking underground line permanently abandoned and routing a clean, new PEX line through walls and attic spaces. Overhead rerouting avoids concrete dust, preserves expensive flooring, and ensures the line will never leak under the slab again.
Why Do Slab Leaks Occur?
Common causes include friction from copper pipe rubbing against sharp aggregate stones during thermal expansion, poor installation kinking, aggressive soil chemistry, and excessive municipal water pressure.
Transparent Pricing & Cost Factors
Costs depend on whether detection requires tracer gas, depth of the concrete slab, and whether you choose direct slab breakout or an overhead bypass reroute.
- Depth and thickness of the reinforced concrete foundation slab
- Repair method: direct concrete breakout vs. non-invasive overhead PEX bypass reroute
- Restoration needs (flooring, tile, concrete, or drywall patching)
- Hot vs. cold water line branch location
Providing Slab & Underground Leak Detection Throughout Portland & Nearby Cities
From our primary dispatch facility at 621 SW 5th Ave in Downtown Portland, our licensed mobile technicians provide full-service slab & underground leak detection across all of Multnomah County, Gresham, Beaverton, Tigard, Lake Oswego, Milwaukie, and Hillsboro. Whether your property is an Eastside Craftsman in Sellwood or a modern build in Washington County, our vans arrive fully equipped for rapid diagnostics and immediate repairs.
Frequently Asked Questions
How accurate is electronic slab leak detection?
Our advanced ultrasonic listening equipment and infrared thermal cameras pinpoint leaks within a 1-to-2 foot radius, eliminating guesswork and large destructive trenches.
Will my homeowner's insurance cover a slab leak in Portland?
Most insurance policies cover the cost of detection and the resulting tear-out and water damage repairs, while the plumbing pipe repair itself is paid out of pocket. We provide itemized documentation for adjusters.
Is it better to jackhammer the floor or reroute the pipe overhead?
In older homes with original copper, an overhead PEX reroute is almost always superior. If one section of underground copper has pitted through, other sections are likely close to failing.
Can an undetected slab leak cause foundation structural settlement?
Yes. High-pressure water escaping beneath a slab washes away structural sub-base sand and gravel over time. This loss of compaction creates hollow voids beneath the slab, leading to severe concrete foundation cracking, uneven floors, and sticking interior doors.
How does nitrogen tracer gas detect small slab leaks?
When a leak is too small or deep to produce detectable acoustic sound, we drain the water line and inject a safe, non-flammable nitrogen tracer mixture under controlled pressure. The tracer gas escapes through the microscopic fracture, rising vertically through concrete pores where our specialized handheld gas sniffer detects it instantly.
Need This Service Today?
Our licensed master plumbers are on the road in fully stocked vans ready to tackle your plumbing issue immediately.
(831) 290-4327OR CCB #234891 · No overtime fees
Related Plumbing Services
Top Service Areas
We provide Slab & Underground Leak Detection across Multnomah, Washington, and Clackamas counties:
- Multnomah County, OR (10–25 minutes county-wide from 621 SW 5th Ave hub)
- Gresham, OR (25–35 minutes via I-84 E or SE Powell Blvd)
- Beaverton, OR (15–25 minutes via US-26 W or Beaverton-Hillsdale Hwy)
- Tigard, OR (20–30 minutes via I-5 S or OR-99W)
- Hillsboro, OR (25–35 minutes via US-26 W)
Helpful Guides & Articles
Get Professional Slab & Underground Leak Detection in Portland Today
Call (831) 290-4327 for rapid same-day dispatch or request a written flat-rate estimate online.