Book a backflow test Book other service Call (720) 818-5569

Mon–Fri 9–6 · Sat by appointment · Active leaks: call now

Snow-covered peaks in Rocky Mountain National Park under a blue sky
  1. Home
  2. Services
  3. Leak detection

Leak detection & repair

Supply lines, wall leaks, slab leaks. We find it before we open anything up.

The short answer

Singer Plumbing Co. locates and repairs leaks in supply lines, inside walls, under slabs, and in water service lines across Denver and the surrounding metro, pinpointing the leak before opening anything. Active leaks get same-day service. If water is running now, shut off your main and call (720) 818-5569.

The expensive part of a leak usually isn't the repair. It's the drywall, flooring, and drying equipment after water has been running somewhere you couldn't see it.

We locate leaks in supply lines, inside walls, under slabs, and in the yard, and we find the spot before anyone starts cutting. Then you get a price to fix it before the work begins.

Signs you have a hidden leak

  • Your water bill jumped with no change in how you use water
  • You hear running water when every fixture is off
  • A warm spot on the floor — usually a hot-water slab leak
  • Staining, bubbling paint, or soft drywall
  • A patch of lawn that's green and soggy while everything around it is dry
  • Musty smell in a room that shouldn't have one

What to do before we get there

If water is actively running and you can't stop it at the fixture, shut off the main. In most metro houses it's in the basement near the front wall where the line enters, in a crawl space, or in a utility closet. Turn it clockwise until it stops.

Then open the lowest faucet in the house to drain the pressure out of the lines. Every minute of running water is more damage and a bigger restoration bill.

Slab leaks

A leak under a concrete slab is the one homeowners dread, and mostly because of what they imagine the repair looks like. Depending on where it is and what the line is made of, the fix may be a spot repair through a small opening, or rerouting the line overhead so nobody touches the slab at all.

Either way, the first job is pinpointing it. Guessing and opening concrete in the wrong place is how a manageable repair turns into a large one.

What we find and fix

  • Supply line leaks, copper and PEX
  • In-wall and under-floor leaks
  • Slab leaks
  • Water service line leaks between the meter and the house
  • Failed shutoff valves and hose bibs
  • Toilet and fixture leaks that don't show at the surface
  • Pinhole leaks in older galvanized and copper lines

Older metro homes

Houses built here in the 1960s and 70s often still have some original galvanized supply piping. Galvanized corrodes from the inside, which means it fails as pinhole leaks that appear one after another in different spots. If you've patched two or three already, the question isn't how to fix this one — it's whether repiping that section makes more sense than another round of patches.

Recent leak repairs

A leaking chrome P-trap under a bathroom sink, with water on the floor
Before: leaking trap
The same chrome drain reassembled after the repair
Trap reassembled after the repair
Corrosion built up around a shutoff valve and braided supply line behind a toilet
Corroded toilet shutoff
New quarter-turn shutoff valves on the hot and cold lines under a sink
New shutoff valves

Photos from our own jobs. Locations and customer details are left out.

From our Google reviews

“Gabe came recommended by my realtor, and his service was excellent as promised. He was responsive, prompt, and did a great job identifying and fixing my plumbing issue. Furthermore, he identified a different plumbing issue in my crawlspace of which I was unaware, spent a significant amount of time investigating the root cause of the problem, and helped me address it.”

Michele D. · Leak found in a crawlspace · Google review
Common questions

Leak detection questions

What are the signs of a hidden water leak?

A water bill that jumped without a change in use, running water sounds when everything is off, a warm spot on the floor, stained or bubbling drywall, or a soggy green patch of lawn.

What should I do if water is leaking right now?

Shut off the main water valve — often in the basement near the front wall, a crawl space, or a utility closet — then open the lowest faucet in the house to drain pressure, and call (720) 818-5569.

Can you fix a slab leak without breaking up the floor?

Sometimes. Depending on location and pipe material, the fix may be a small spot repair or rerouting the line overhead so the slab isn't touched. Pinpointing the leak first is what keeps the repair small.

Let's get it fixed.

Call or text and tell us what's going on. A photo helps.

Call Text Book