Leak detection in Concord
& the Bay Area.
Find it without tearing everything apart. Fix it right.
A high water bill, a warm spot on the floor, the sound of water running at 2 AM — we use acoustic listening, pressure testing, and thermal imaging to find exactly where water is escaping. No guesswork, no unnecessary demolition.
Non-invasive detection
Acoustic, pressure, and thermal methods.
Slab, wall & underground
We find leaks in every location.
Same-day available
Most calls seen the same day.
CA Lic. #802256
Licensed, insured, family-owned.

“They found a slab leak in 45 minutes that we'd been chasing for weeks. Saved our floors.”
Linda G.
Concord, CA · Google
What We Do
Find the leak.
Minimal disruption.
Permanent fix.
Most leaks are hidden — inside slabs, behind walls, or underground. We use equipment-based detection to locate them precisely before any demolition or excavation begins. You know exactly where the problem is before work starts.
Call (925) 288-0409Slab leaks
Underground leaks
In-wall leaks
Water line leaks
Pool & irrigation
High water bill diagnosis
Non-invasive methods
Same-day available
How It Works
From the first call
to pressure confirmed.
- Step 1:
Review the Evidence
We ask about your water bill, where you've seen moisture, and check your meter. Narrows down the leak location before we touch anything.
- Step 2:
Non-Invasive Detection
We use acoustic listening equipment, pressure testing, and thermal imaging where needed to pinpoint the leak without tearing into walls.
- Step 3:
Show You the Location
We mark exactly where the leak is and explain the repair options — before any work begins.
- Step 4:
Repair & Verify
We fix the leak and re-test the system to confirm pressure is restored and no secondary leaks exist.

Know the Difference
Is it a leak — or just condensation?
We'll find out.
Types of leaks we find
Each leak type requires a different detection method. We use the right tool for the right problem.
Slab leak
Acoustic + pressure testThe most serious and costly if ignored. We locate it precisely before any concrete is touched.
In-wall leak
Moisture + thermalOften shows up as discoloration, mold, or musty smell. We find the source without unnecessary drywall demolition.
Underground supply line
Pressure isolationA section-by-section pressure test isolates the failing segment, minimizing excavation.
Signs you may have a leak
Don't wait — early detection costs a fraction of deferred damage.
- Water bill suddenly higher than usual
- Warm spots on floor (possible slab leak)
- Sound of running water when everything is off
- Wet spots, staining, or mold on walls
- Low water pressure throughout the house
- Meter spinning with all fixtures off
FAQ
Common questions
What homeowners ask before calling us.
Leak detection typically runs $150–$350 depending on complexity and method. If the leak requires acoustic listening, pressure testing, or thermal imaging, we explain what we're using and why before we start. You get a clear price upfront — no surprises. Call (925) 288-0409 for specifics.
Common signs include warm spots on your floor, the sound of running water when everything is off, unexplained spikes in your water bill, or wet areas along the base of walls. Your water meter spinning with all fixtures closed is also a strong indicator. If you notice any of these, call us before the damage compounds.
Not to find the leak. We use acoustic listening equipment and pressure testing to locate it first. If a repair requires opening a wall or floor, we'll tell you exactly where and how much — before any demolition happens. Our goal is to minimize disruption while solving the problem permanently.
Most leak detection calls take 1–2 hours. Slab leaks and underground supply line leaks can take longer depending on system complexity and pipe access. We give you a realistic estimate on arrival so you know what to plan for.
Yes — and faster than most homeowners expect. A slow slab leak can erode the foundation over months. An in-wall leak creates mold within 24–48 hours. Even a small underground leak wastes thousands of gallons and drives up your bill. Early detection is almost always far cheaper than deferred detection.
Both. We locate the leak precisely and then handle the repair. You won't need to call a second contractor. If the repair scope is significant — like a slab penetration — we explain what's involved and give you options before proceeding.
Turn off your main water shutoff if you believe there's active water damage occurring, then call us at (925) 288-0409. Do not run water until we've assessed the situation. If you can check your water meter — shut off all fixtures and see if the meter dial is still moving — that's a useful data point to share with us.
Customer Reviews
Don't take our
word for it.
“They found a slab leak in 45 minutes that we'd been chasing for weeks. Saved our floors. The technician explained every step before doing it and marked the exact spot. Professional and genuinely helpful.”
“We had a high water bill for two months and couldn't figure out why. Guerra Bros. came out, pressure-tested the system, and found a supply line leak under the driveway. No guessing, no unnecessary digging. Just a clean answer.”
“Noticed a musty smell in our hallway and some wall discoloration. They used thermal imaging to find an in-wall leak behind the drywall without tearing everything apart. Fixed it and we were done. Can't ask for more than that.”
Where We Work
Leak Detection near you.
Same-day service available in Concord, Walnut Creek, Martinez, and throughout Contra Costa County.
Don't see your city? Call us — we may still serve your area.
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