Most slab leaks in Colorado Springs don’t announce themselves, which is exactly why I tell homeowners to stop trusting their eyes on this one. There’s no puddle on the floor, no wet spot on the wall, no dramatic burst. What there is, if you know where to look, is a water meter that doesn’t stop moving when it should.
A slab leak happens when a water pipe buried under your concrete floor starts leaking. That water goes into the gravel bed or soil below the slab. Colorado’s soil is dry and porous (full of tiny gaps), so the water spreads out instead of pooling into a visible puddle. That means it often doesn’t show up for weeks or months. By the time you see warning signs, warm spots on the floor, cracked tile, a musty smell, the leak has usually already been running for weeks or months, and I’ve opened up slabs where it had clearly been running longer than that. The whole time, it’s been wearing away the material under your slab, and your water bill has been climbing.
The water meter test catches the leak before any of that happens. It costs nothing, takes 30 minutes, needs no tools, and it’s the first thing I have a homeowner do before I ever pick up a jackhammer.
Why Colorado Springs Homes Are Slab Leak Prone
Most Colorado Springs homes built after 1960 sit on a concrete slab instead of a basement or crawlspace. That’s called slab-on-grade construction. Both the hot and cold water pipes run inside or under that slab to reach the sinks, tubs, and other fixtures in the house. It’s an efficient way to build, but it also means a pipe failure happens somewhere that’s hard to reach and easy to miss.
Three things about Colorado Springs make slab leaks more likely here:
Hard water corrosion. Colorado Springs city water (from Colorado Springs Utilities) is soft to moderately hard, typically 1.3 to 2.8 grains per gallon (the standard way to measure dissolved minerals in water), so this usually isn’t a major factor for homes on city water. Homes on a private well, common in outlying areas like Black Forest, Falcon, and Monument, can have genuinely hard water. In those homes, calcium and magnesium build up inside copper pipe over time. They also react with the copper itself, in a process called pitting corrosion: tiny pits form in the pipe wall. Over years, those pits can eat all the way through the pipe wall and cause a pinhole leak. Copper pipe installed in Colorado Springs homes from the 1960s through the 1980s is often at, or past, the end of its useful life from age alone, and faster if the home is on hard well water.
High water pressure. As we cover in our water pressure guide, water pressure that stays above 80 PSI (pounds per square inch, the standard unit for water pressure) puts extra strain on every part of the plumbing system. For pipe buried in a slab, that strain shows up most at bends and joints, the same spots where corrosion is usually worst and where the pipe was disturbed most during installation. High pressure speeds up failure at those already-weak points.
Soil movement under and around the slab. Much of the ground under Colorado Springs contains expansive clay soil. That soil swells when it gets wet and shrinks again as it dries out, and it can push on a foundation with thousands of pounds of force per square foot. That swelling and shrinking, not the outside freeze-thaw cycle, is what moves the ground under a slab. (Colorado Springs does get more than 100 freeze-thaw cycles a year, and those cycles do affect the soil at the outside edge of a foundation. But the soil under the middle of a heated house stays too warm to freeze, so freeze-thaw isn’t the cause of movement there.) Years of this soil movement stress the water pipe at its joints, especially at elbows and T-fittings where the pipe changes direction. The pipe itself may still be in good shape, but the joint slowly fatigues from the repeated movement until it leaks.
The Water Meter Test: Step by Step
What you need: Nothing. Just access to your water meter.
Step 1: Find your water meter
In Colorado Springs, your water meter is usually in a small box set into the ground near the street or sidewalk, in front of your house. The box has a metal or plastic lid that lifts off or unscrews. Inside is the meter itself: a dial face showing total gallons used, like an odometer, plus a low-flow indicator.
Step 2: Note the low-flow indicator
The low-flow indicator is a small dial, triangle, or star shape on the meter face. It spins with any water movement, even a tiny flow. It’s more sensitive than the main gallon counter, which moves too slowly to show a small leak right away. Find it before you start the test.
Step 3: Shut off all water in the house
Turn off every faucet. Check every toilet to make sure it isn’t running: lift the tank lid and confirm the fill valve is quiet and no water is moving. Turn off the dishwasher. Make sure the ice maker isn’t actively filling. Turn off the swamp cooler (evaporative cooler) supply if you have one. Turn off every irrigation zone.
This step matters a lot. Any water running anywhere in the house will move the meter and give you a false alarm.
Step 4: Note the meter reading
Write down the current meter reading. Also note whether the low-flow indicator is moving. If it’s moving before you start the timer, there’s already a detectable leak somewhere.
Step 5: Wait 30 minutes
Don’t use any water. Don’t flush a toilet. Don’t open a faucet.
Step 6: Return and read the meter
Compare the current reading to what you wrote down. Check the low-flow indicator.
Interpreting results:
- Meter unchanged, low-flow indicator still: No detectable leak. The plumbing system is holding pressure. Run this test monthly and keep a log.
- Low-flow indicator moving, meter reading changed slightly: There is water flow somewhere in the system. Go back inside and re-check every fixture. The most common false alarm is a running toilet. Check that each toilet tank isn’t slowly filling before you decide there’s a supply leak.
- All fixtures confirmed off, meter still moving: Water is leaving the supply system through a leak. This could be a supply line leak inside the house (under a sink, at a valve connection), or an underground slab leak.
Isolating the Leak Location
If the meter is moving with all fixtures off, the next step is to figure out whether the leak is above ground or below it.
The main shutoff test:
Find the main shutoff valve inside the house. It’s usually where the supply line enters from the meter, often in the garage, utility room, or crawlspace. Close it all the way. Then go back and check the meter.
- Meter stops moving after closing the interior main shutoff: The leak is inside the house, between the main shutoff and the fixtures. Check all the supply connections under sinks, behind toilets, at the water heater, and at the washing machine.
- Meter keeps moving after closing the interior main shutoff: The leak is in the underground supply line between the street meter and the interior shutoff, either in the yard or under the slab.
If the leak is underground, call a licensed plumber with leak detection equipment. Electronic leak detection uses acoustic (sound-based) or pressure-based tools to find roughly where an underground leak is, without opening up the slab. That’s how a plumber avoids cutting open your whole floor to find one pinhole leak, and exactly what I’d do before touching a single tile.
Monthly Monitoring: Making It a Habit
The value of the water meter test is in the pattern, not a single reading. A single test tells you whether there’s a leak right now. Monthly tests over time show you whether your water use is trending upward. That upward trend is the early warning sign of a slow leak, one that hasn’t yet shown up clearly on a single test.
The log method:
Keep a simple note of the meter reading on the same date each month. Write down the reading in gallons. Over three to six months, compare the readings to your normal household water use. If a household hasn’t changed its habits but is using 20% more water each month, something is running that shouldn’t be.
Colorado Springs Utilities bills you monthly. Comparing your own meter readings to your water bill confirms the meter is accurate and gives you a second way to track your water use over time. If a bill comes in higher than expected and you can’t explain why, run a meter test before you get three high bills in a row.
Other Early Warning Signs
The water meter test is the most reliable early detection method, but other observations support it:
Warm spots on the floor: A hot water line leak beneath a slab warms the concrete and flooring above it. Walking barefoot on a slab floor, you might feel a warm spot with no heat source above it, like a vent or a sunny window. In winter, a section of tile that’s noticeably warmer than the tile around it is worth paying attention to.
Higher water bills with no usage change: This is usually the first sign homeowners notice, often after two or three billing cycles. By the time you’ve gotten three high bills in a row, the leak has already been running for at least several weeks.
Cracked or lifting floor tile: Moisture from a slab leak slowly moves upward until it reaches the thinset, the cement-based glue that holds tile in place. The moisture softens the thinset, the tile loses its grip, and it eventually cracks or lifts at the edges. This is a late warning sign. By the time tiles are cracking, the moisture has been there for months.
Musty smell in specific areas: Moisture under a slab can work its way up through cracks or expansion joints (the gaps built into concrete to let it move slightly without cracking). That creates a musty, earthy smell in that one spot. This is different from the general musty smell of a house that just needs better airflow: a slab leak smell stays in one place and doesn’t go away.
Mold at baseboards: If water moving up through the slab reaches the bottom of the drywall, mold grows along the baseboard, the trim board where the wall meets the floor. This is often mistaken for a leak inside the wall itself, so homeowners cut open the wall before anyone thinks to check the slab.
What Happens When a Slab Leak Is Confirmed
A confirmed slab leak requires a licensed plumber. The repair options:
Spot repair: The plumber cuts open the slab at the leak, repairs or replaces that section of pipe, and patches the concrete back over it. Best when the rest of the pipe is in good shape and the leak is easy to reach. Cost: $1,500–$3,500, plus the cost of repairing any flooring or finished surface above the cut.
Rerouting: The plumber leaves the leaking section of pipe in place, unused, and runs a new pipe through the walls or attic instead. No slab cutting needed. Best when the leak is under a finished area that would be expensive to tear up, or when the pipe at the leak is in bad shape overall. Cost: $800–$2,500 for the reroute, plus the cost of repairing any holes cut in walls or ceilings.
Whole-house repipe: The plumber abandons all the pipe in the slab and replaces it with new pipe run through the walls and attic, usually PEX (a flexible plastic pipe that resists corrosion better than copper). Best for homes with original 1960s–1980s copper pipe that’s had one slab leak already, when the pipe’s overall condition suggests more leaks are likely. This removes all future slab leak risk, and it’s the option I lean toward on any 1960s-70s copper system that’s already thrown one leak. Cost: $4,000–$10,000+ depending on home size.
The right choice depends on the age of the overall plumbing system, the location of the leak, and the pipe’s condition as assessed by the plumber. A spot repair on a 1970s copper system that’s showing signs of corrosion at multiple locations is often just moving the failure to the next weak point.
The 30-Minute Investment
A monthly water meter reading takes less time than checking social media. It requires no equipment, no plumbing knowledge, and no professional involvement. It catches leaks, both above and below the slab, before they cause the damage that makes them expensive to fix.
The age of Colorado Springs’ slab-on-grade homes, plus genuinely hard water for anyone on a private well, makes this habit especially worth building here. The copper pipes in homes built in the 1960s and 1970s are 50–60 years old now. They’re not all failing. But some are. Monthly meter checks are how you find out before your floor does.
If you’re concerned about your water use, or want me to check your plumbing’s condition, call (719) 243-9718.
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