A slab leak — water or sewer pipe failure beneath your home's concrete foundation — is one of the most stressful plumbing problems a homeowner can face. Left undetected, it can cause foundation damage, mold growth, and water bills that skyrocket seemingly overnight.
Washington County's clay-heavy soil, Oregon's frequent freeze-thaw cycles in winter, and the age of housing stock in Tigard, Beaverton, and Hillsboro all contribute to a higher-than-average rate of slab leak issues in this region.
What Is a Slab Leak?
A slab leak occurs when a water supply line or drain line running beneath (or through) your concrete slab foundation develops a crack, pinhole, or joint failure. Water then slowly — or rapidly — seeps into the soil beneath your home or up through the concrete.
Common Warning Signs of a Slab Leak
- Unexplained spike in your water bill — even when usage hasn't changed
- Sound of running water when all faucets and fixtures are off
- Warm or hot spots on your floor — especially on tile or hardwood over a slab
- Cracks appearing in walls or flooring as the slab shifts
- Mold or mildew smell without any visible source
- Low water pressure throughout the house
- Wet or damp carpet or flooring with no surface water source
Why Are Slab Leaks More Common in Washington County?
Several Oregon-specific factors increase the likelihood of slab leaks in the Tigard-Beaverton area:
- Freeze-thaw cycling: Oregon winters regularly dip below freezing, then warm back up. This repeated expansion and contraction stresses underground pipes.
- Clay soil movement: Washington County's expansive clay soils swell when wet and contract when dry — creating lateral pressure on pipes embedded in or below the slab.
- Older copper pipes: Many homes built in the 1960s–1980s have copper pipes that have been thinned by mineral-rich Oregon water over 40+ years.
- Seismic activity: While not major, the Pacific Northwest's occasional earth movement can stress underground plumbing joints.
How Professional Slab Leak Detection Works
Professional slab leak detection is non-invasive — no jackhammering required to find the leak. At Hydro Plumbing, we use:
- Electronic listening devices: Sensitive microphones detect the sound frequency of water escaping pressurized pipes beneath concrete.
- Thermal imaging: Infrared cameras identify temperature anomalies on the floor surface caused by hot water leaks.
- Tracer gas testing: Non-toxic gas is pumped into the plumbing system, and a sensor detects where it escapes through the slab.
Detection typically takes 2–4 hours. Once we identify the exact location, we mark it on the floor so repairs can be made with the minimum amount of concrete removal.
Slab Leak Repair Options
Depending on pipe condition and access, we may recommend:
- Spot repair: Break through the slab at the exact leak point, repair or replace that section of pipe, and repour concrete. Best for isolated leaks in otherwise good pipe.
- Pipe rerouting: Run a new supply line through walls or attic, bypassing the slab entirely. Avoids concrete work and is preferred when multiple leaks are likely.
- Epoxy pipe lining (CIPP): Line the existing pipe from the inside with an epoxy coating, sealing pinhole leaks without concrete removal. Works on drain lines and some supply lines.
- Full repiping: When the slab pipe system is broadly deteriorated, full repiping through the attic or walls is the most cost-effective long-term solution.
What to Do Right Now If You Suspect a Slab Leak
- Turn off your main water supply valve to stop ongoing damage
- Document signs you've noticed (sounds, wet areas, bill spikes)
- Call a licensed plumber for detection — don't break concrete before knowing the exact location
- Contact your homeowner's insurance — slab leaks are often covered for detection and repair costs
Slab Leak Detection Service in Washington County
Hydro Plumbing provides professional slab leak detection and repair throughout Tigard, Beaverton, Hillsboro, Lake Oswego, and all of Washington and Yamhill Counties. We use electronic detection equipment to locate leaks precisely before any concrete is touched. Call (971) 241-2628 or request a free estimate today.