Leak Detection Portland OR — Find It Before You Open the Wall

We Find It Before We Open Anything

We use electronic acoustic listening equipment and thermal imaging to locate water leaks without tearing up walls. In most cases we pinpoint the hidden leak within a few inches before opening any drywall or concrete. That means less restoration work for you after the repair — and a firm repair quote before any access work begins.

How to Know If You Have a Hidden Leak

• Your water bill went up without a change in how you use water
• You can hear running water when everything in the house is off
• There’s a damp patch on a wall, ceiling, or floor with no obvious source
• One area of your floor feels warm (hot water line leaking under a slab)
• Your water meter keeps moving after all fixtures are shut off
• Musty smell or mold in an area without visible moisture

How Non-Invasive Leak Detection Works

Understanding the technology behind leak detection helps you evaluate whether the approach being recommended makes sense — and why it costs what it does.

Acoustic listening equipment — Pressurized water escaping from a pipe leak creates a sound signature — a hiss or rush — that travels through pipe material and surrounding structure. Electronic amplifiers pick up these frequencies through concrete, wood framing, and drywall. A trained technician distinguishes an active water leak from background noise by moving the sensor and noting where the signal is strongest. In most cases we can narrow the leak location to within 6–12 inches through a slab or wall surface before any access work begins.

Thermal imaging — Active leaks change the temperature of surrounding material. A hot water line leaking under a slab creates a warm spot on the floor surface that a thermal camera maps precisely. Cold water leaks in walls show as cooler patches against ambient drywall temperature. Thermal imaging is most reliable for hot water leaks and for leaks that have been running long enough to change the thermal profile of the surrounding material.

Pressure isolation testing — We isolate sections of your supply system by closing valves and monitoring pressure drop. This identifies which branch of the system is losing water — cold vs. hot, which wing of the house, above or below the slab. Pressure testing is useful when acoustic signals aren’t clear, or when you want to confirm whether the system is actively losing water before committing to a detection visit.

Portland Pipe Leak Causes by Home Era

The most likely cause of a hidden pipe leak in Portland depends heavily on when your home was built and what material is in the walls.

Pre-1940 homes (inner SE, NE, North Portland) — Galvanized steel supply lines. Galvanized corrodes from the inside out over 60–80 years, developing pinhole leaks at corroded sections and fittings. These pinhole leaks often run inside walls for months before producing visible moisture damage. A galvanized supply system in a home built before 1940 should be inspected proactively — not just when a visible problem appears.

1940s–1990s homes (copper supply lines) — Portland homes from this era use copper, which typically lasts 50–70 years under normal conditions. Pinhole leaks in copper occur from pitting corrosion — a reaction between pipe material, water chemistry, and in some cases stray electrical current from improper grounding. Pitting is most common at soldered fittings and at dissimilar metal connections where copper meets galvanized. A single pinhole in copper doesn’t necessarily mean the entire system is failing, but it warrants inspection of nearby fittings and sections.

Post-2000 construction and remodels (PEX) — PEX supply lines themselves rarely develop leaks; failures occur at fittings — crimp rings, clamp rings, or push-fit connections that weren’t installed correctly or have shifted from minor seismic movement. In multi-unit residential buildings in the Pearl District, South Waterfront, and Lloyd District, PEX manifold leaks are a recurring pattern. A slow manifold leak can run inside a wall or under a subfloor for weeks before appearing as visible damage.

1978–1995 homes (polybutylene) — Polybutylene — grey plastic pipe sometimes labeled PB2110 — was installed in some Portland-area homes through the 1970s–1990s. It fails internally from reaction with chlorinated water, cracking at fittings. If your home has this material, proactive assessment is worth scheduling rather than waiting for an emergency water leak.

Slab Leaks: Detection, Options, and Cost

A slab leak is a failure in a supply line running beneath your concrete foundation. Portland has a significant number of post-WWII slab-on-grade homes, particularly in Beaverton, Tigard, and Milwaukie — built in the 1950s and 1960s with copper supply lines under the slab. As those lines reach 60–70 years of age, pitting corrosion produces pinhole leaks that are invisible from above but steadily erode the subfloor, foundation, and structure.

Signs of a slab leak: a warm patch on tile or hardwood flooring, the sound of running water audible through the slab, a water bill that climbs month after month with no visible source, or mold appearing at floor level on baseboards without any other moisture explanation.

Once we locate the slab leak acoustically, we give you three options with costs on each:

• Direct slab access — Targeted jackhammer opening, pipe repair, slab patch. Appropriate when the failure is isolated and the surrounding copper is in good condition. Typically $1,500–$3,000 depending on slab depth and floor finish above.
• Above-slab reroute — A new supply line runs through the walls and ceiling, bypassing the failed slab section entirely. No concrete demo. Cost depends on routing distance — typically $1,200–$2,500. Preferred when the slab has finished tile or hardwood you’d rather not disturb.
• Whole-house repipe — If multiple slab sections are weakening or the copper system is at end of life, repiping with PEX eliminates the problem permanently. Quoted separately based on home size and complexity.

You choose the approach. We give you real numbers on each option before any access work starts. Leak detection is one of the core services from our emergency plumbing service in Portland — same licensed team, flat-rate structure, no after-hours surcharge.

What Leak Detection Costs — And Why It’s Worth It

Electronic water leak detection runs $150–$350 depending on property size and how many areas need testing. That fee tells you exactly where the leak is — not an approximate zone that leads to opening half a wall. When we detect and repair in the same visit, the detection cost applies toward the repair. We quote the repair before opening anything.