Slab Leak Repair & Detection

Slab Leak Repair in Des Moines and Urbandale, IA

 

72 Degrees detects and repairs slab leaks for residential properties throughout Urbandale, Ankeny, Des Moines, Johnston, Clive, Grimes, and the surrounding Polk County metro. A slab leak is a failure in a water supply or drain line running beneath the concrete foundation of your home. Left unaddressed, it causes progressive damage to the slab, the flooring above it, and the soil beneath it.

 

We locate slab leaks using non-invasive equipment before recommending any approach to access or repair. Our goal is to confirm the failure point precisely so the repair is targeted rather than exploratory.

 

Call (515) 965-7272 for slab leak service or emergency response. Available 24/7 with no overtime charges.

 

What Causes Slab Leaks in Des Moines

 

Slab leaks in the Des Moines area have three primary causes, and Iowa's specific climate and water conditions make each of them more prevalent here than in more stable environments.

 

Pipe corrosion: Des Moines Water Works supplies water at 157 ppm (9 grains per gallon), which is in the hard to very hard range. Over decades, the mineral content in the supply water corrodes copper pipe through a process called formicary corrosion. Older copper supply lines running beneath slabs in Des Moines homes, particularly those built in the 1960s through 1980s, are susceptible to this type of pinhole failure.

 

Soil movement from freeze-thaw cycles: Iowa winters subject the soil beneath foundations to repeated freeze-thaw cycles. IECC Zone 5A conditions mean the ground freezes to significant depth in Polk County most winters, and the resulting soil movement stresses rigid pipe connections beneath the slab. Over time, this stress produces joint failures and cracks in the pipe.

 

Pipe abrasion: supply lines running through or beneath concrete shift slightly as the slab moves. Where pipe contacts concrete or gravel fill, the outer surface wears down over years of micro-movement. This is more common in homes where slab settling has occurred.

 

Signs of a Slab Leak in Your Home

 

Slab leaks are rarely immediately obvious. These are the most common indicators that one may be present:

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• A water bill that has increased without a corresponding change in usage

• Warm or hot spots on the floor surface, particularly in areas without radiant heating

• The sound of running water when all fixtures and appliances are off

• Visible cracks appearing in floor tile, vinyl, or the slab surface itself

• Damp carpet or flooring without a surface-level moisture source

• Mold or mildew odors at floor level

• A water meter that continues to move after all water use has stopped

 

If two or more of these are present, schedule a slab leak inspection rather than waiting for the situation to clarify. Slab leaks do not resolve on their own, and the secondary damage they cause, including foundation erosion, flooring replacement, and mold remediation, typically costs far more than the repair itself.

 

How We Detect Slab Leaks

 

Locating a slab leak precisely is what determines whether the repair requires minimal access or significant floor demolition. We use acoustic sensors, thermal imaging cameras, and electronic pressure testing to pinpoint the failure before touching the floor.

 

Acoustic sensors detect the sound signature of water escaping under pressure through concrete and soil. The equipment filters ambient noise and isolates the leak sound to a specific location, which we mark on the floor surface above it.

 

Thermal imaging identifies the temperature differential caused by water moving beneath the slab. A leak that has been running long enough to saturate the surrounding fill material shows a distinct thermal pattern visible through the floor surface.

 

Electronic pressure testing confirms whether a supply line has integrity loss and helps isolate which line is involved before the acoustic work begins.

 

The combination of these methods allows us to locate most slab leaks to within a few inches of the actual failure point, which makes the repair access as small as possible.

 

Slab Leak Repair Methods

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The repair method depends on the location of the failure, the age and condition of the pipe, and the extent of

damage to the surrounding structure. We assess each situation individually and recommend the approach that resolves the problem with the least disruption to your home.

 

Spot Repair (Direct Access)

 

Direct access is used when the failure is isolated, the pipe is otherwise in good condition, and the location can be accessed without disproportionate floor demolition. We open a targeted section of flooring, expose and repair or replace the failed pipe section, and restore the concrete. This is the least invasive repair for a single isolated failure in a pipe that is otherwise sound.

 

Pipe Rerouting

 

When the failed section of pipe is in a difficult access location, or when pipe condition suggests additional failures are likely nearby, rerouting bypasses the failed underground section entirely. The new supply line runs through the wall structure, attic, or other accessible path, leaving the compromised underground section abandoned in place. No slab demolition is required. This is often the fastest and least disruptive option for supply line slab leaks in older Des Moines and Urbandale homes.

 

Epoxy Pipe Coating (CIPP)

 

For drain line slab leaks where the pipe is cracked but still structurally present, an epoxy liner can be applied from inside the pipe, sealing the failure without excavation. This approach follows the same principles as the CIPP trenchless method described on our sewer services page.

 

Repiping

 

When inspection indicates that the supply system beneath the slab has widespread corrosion rather than a single isolated failure, full repiping addresses the underlying condition rather than individual symptoms. New PEX supply lines run through accessible above-slab paths, and the compromised underground copper is abandoned in place. See our leak detection & pipe repair page for more on the repiping process.

 

Why Slab Leaks Are More Common in the Des Moines Area

 

The combination of hard water, freeze-thaw soil stress, and a substantial housing stock from the 1960s through 1980s makes slab leaks more common in the Des Moines metro than in parts of the country with softer water or more stable soil conditions.

 

Polk County neighborhoods with the highest concentration of slab-foundation homes from this era include established sections of northwest Des Moines, older Urbandale blocks east of Douglas Avenue, parts of Clive, and Ankeny neighborhoods developed during rapid postwar growth. Many of these homes have never had their below-slab plumbing inspected and are now reaching the age at which pipe condition becomes a legitimate concern.

 

Des Moines Water Works completes an annual leak survey of its distribution system using ultrasonic detection and routinely confirms more than 100 leaks per year in the supply network. The private supply lines inside homes are not included in that survey and are the homeowner's responsibility. If your home sits on a slab and was built before 1985, a baseline pipe inspection is a reasonable step toward understanding what you have. Des Moines's hard water also affects water heater lifespan and supply pipe condition throughout the home, not just below the slab. See our water quality services page for whole-home water softener options that address the underlying mineral content.

 

Schedule Slab Leak Service in Des Moines and Urbandale

 

Call (515) 965-7272 for slab leak detection or repair. Emergency dispatch available 24/7 for active slab leaks, no overtime charges.

 

3074 104th Street, Urbandale, IA 50322

 

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Frequently Asked Questions

 

How much does slab leak repair cost in Des Moines?

 

Costs vary significantly by method. Spot repairs through direct access typically run $500 to $1,500 for the pipe repair itself, plus any flooring restoration. Pipe rerouting typically runs $1,000 to $3,000 depending on the complexity of the new line path. Repiping is a larger project appropriate when the full supply system needs attention. 72 Degrees provides upfront pricing before any work begins. See our financing options.

 

Does homeowner's insurance cover slab leak repair?

 

Many homeowner's insurance policies cover sudden and accidental slab leak damage, including the cost of accessing the pipe (breaking through the slab) and resulting water damage to the home interior. The pipe repair itself is often excluded, but consequential damage may be covered. Coverage varies by policy. We document the nature and location of the failure thoroughly to support the claims process.

 

How long does slab leak detection take?

 

The detection process typically takes 1 to 2 hours. Locating the leak precisely is the step that determines the repair method, the access required, and the total scope of work. We do not skip it in order to start faster.

 

What are the signs of a slab leak in an Urbandale or Ankeny home?

 

Common signs include unexplained water bill increases, warm spots on the floor, the sound of water running when everything is off, new cracks in floor tile or the slab surface, and damp carpet or flooring without a surface moisture source. Two or more of these together is a strong indicator. See the signs section above for the full list.

 

Can a slab leak be repaired without breaking up the floor?

 

Often, yes. Pipe rerouting bypasses the failed underground section by running new supply lines through walls or other above-slab paths, with no slab demolition required. We recommend the approach that resolves the problem with the least disruption to your home, not the most invasive one.

 

Why are slab leaks more common in older Des Moines homes?

 

Homes built in the 1960s through 1980s in Polk County commonly have copper supply lines that are now 40 to 60 years old. Des Moines Water Works supply at 157 ppm accelerates the corrosion process, and Iowa's freeze-thaw soil movement stresses pipe joints over decades of cycling. The combination produces failure rates higher than national averages for comparable pipe ages.

 

What is pipe rerouting and is it better than a direct spot repair?

 

Pipe rerouting bypasses the failed underground pipe section by installing new supply lines through walls or ceiling rather than through the slab. It avoids slab demolition entirely and is often faster and less costly when the failed section is in a difficult location. Whether it is better than a spot repair depends on the location of the failure and the condition of the surrounding pipe, which we assess before making a recommendation. See leak detection & pipe repair for more.

 

Should I get a slab inspection if my home was built before 1985?

 

It is a reasonable step, particularly if you have noticed any of the warning signs listed above, if your water bills have been rising without explanation, or if you are buying or selling the property. A pipe inspection does not require opening the slab. We use acoustic and thermal tools to assess condition and identify any active losses. Call (515) 965-7272 to schedule, or see our full plumbing services for related services.