Slab Leak Repair and Under-Slab Plumbing in Greenville, TX
Licensed Master Plumber M-43562 · $97 diagnostic · reroutes quoted in writing · financing available · 15% off same-day approval
Greenville sits on the Blackland Prairie clay of Hunt County, and more than half of its homes were built before 1980. Moving clay and decades-old pipe make leaks under the slab a real risk. We find the leak, tell you whether it's a water line or a drain, and give you a written price to repair it, reroute it or repipe.
- Licensed & Insured (TSBPE M-43562)
- $97 Diagnostic
- Upfront Pricing
- Certified Price Review
Signs of a slab leak
- Your water bill jumps and nobody is using more water.
- The meter's leak indicator spins with every faucet off.
- A warm spot on the floor (a hot-water line leaking under the slab).
- The sound of running water when nothing is on.
- Damp carpet, lifting wood or vinyl, or a musty smell that won't go away.
- New cracks in tile or drywall, or doors that suddenly stick.
Water-line leak or drain leak?
"Slab leak" covers two different problems, and the fix and price are different:
- Water (supply) line leak: pressurized copper or other water pipe under the slab. Shows up on the meter. Fixed by a spot repair, a reroute or a repipe.
- Drain line leak: the cast iron or plastic drains under the slab. Doesn't spin the meter, but soaks the soil every time you run water. Found with a drain test and camera. Fixed by tunneling.
We test both, so you aren't paying for the wrong repair.
Why Greenville slabs see leaks
- Clay that moves. Hunt County covers 840 square miles of the Texas Blackland Prairie (Handbook of Texas). The region's signature soil, Houston Black clay, shrinks and swells markedly with changes in moisture; the USDA notes cracks 1/2 to 4 inches wide in dry periods. Wet-dry cycles flex the slab and the pipes in and under it.
- Pipe that has been in the ground a long time. The Census Bureau's American Community Survey (2020–2024 5-year estimates) puts the median year a Greenville home was built at 1979, with about 53% of housing units built before 1980. The American Society of Home Inspectors says galvanized steel was the go-to water pipe from the 1850s to the 1950s and copper from the 1960s on, so a pre-1980 Greenville home may have 45 years or more of wear on the water lines under its floor.
- Look up your water service line. The City of Greenville's 2025 Lead and Copper Rule Revisions inventory, submitted to the TCEQ, lists every water service line as lead, galvanized, non-lead or unknown, and you can search it by street address from the City's Water Distribution / Wastewater Collection page. It doesn't cover the plumbing under your slab, but it's a free look at what's in the ground at your address.
Three ways to fix a water-line slab leak
Want the full breakdown? Read our guide: Slab leak: repair, reroute, or repipe?.
- Direct repair. We pinpoint the leak and open the slab (or tunnel to it) to replace the bad section. Best for a single leak in otherwise sound pipe. A water-line / supply-side spot repair is $2,250–$4,550.
- Reroute. We abandon the leaking line under the slab and run new PEX through the attic and walls to the affected fixtures. No digging under the house, and it removes that line from the slab for good. We quote it in writing after the diagnostic, based on the fixtures that line feeds.
- Repipe. If the house has leaked more than once, or the pipe is the same age everywhere, replacing the water lines in PEX can cost less than chasing leaks. See repiping.
Drain leaks under the slab
A leaking drain is repaired or replaced by tunneling under the foundation from outside. If the drains are cast iron and failing along their length, replacing the run is usually cheaper than chasing leaks. See sewer line replacement in Greenville and our cast iron pipe replacement cost guide.
Slab leaks and your foundation
Leaking water under a slab softens and swells the clay soil the foundation rests on, and Houston Black, the Blackland Prairie's signature clay, is recognized worldwide as a classic shrink-swell soil. If you have a foundation company coming out, have the plumbing tested first: fix the leak, then level the house. If they need the lines tested, we can camera and pressure-test them and share what we find.
Slab leak repair cost in Greenville
Here's what we can price before we see it, and what we price after we find the leak:
A reroute's price depends on how many fixtures the leaking line feeds. Either way, you get the price in writing before any work starts.
Start with a $97 diagnostic
Every job starts with a $97 diagnostic, a camera inspection or walk-through as needed, and a written quote before work begins. We're open Monday through Saturday, 7 AM to 7 PM, and closed Sunday.
Already have another quote? Send it to us.
Certified Price Review: We'll match or beat apples-to-apples plumbing scopes. Send us a written, itemized slab leak repair estimate from another licensed plumber. We compare scope, installation method, materials, access/excavation, warranty and diagnostics. If the work is directly comparable, we may adjust our price. Verbal or incomplete estimates may not qualify, and a review doesn't obligate us to match. See program terms →
Financing: Larger jobs like reroutes, repipes and under-slab drain work can be split into monthly payments. Financing is available, subject to credit approval. See financing options →
Save 15% when you approve the same day. Approve your written quote the day we give it to you and we take 15% off.
Greenville slab leak FAQs
How much does slab leak repair cost in Greenville?
It depends on the repair. Tunneling to reach a leak or a drain is $3,375 minimum for the first 5 ft, then $425 per foot, plus $1,150 per access hole. A water-line / supply-side spot repair is $2,250–$4,550. A reroute is quoted in writing after the $97 diagnostic. You save 15% if you approve the same day.
Is it better to reroute or repair a slab leak?
A first, single leak in otherwise good pipe can be repaired directly. If the line has leaked before, or the pipe is the same age as the rest of the house, a reroute takes it out from under the slab for good.
Does homeowners insurance cover slab leaks?
Policies vary. Many cover the cost to access the leak and the resulting water damage, but not the pipe itself. Check your policy; we give you the leak location and an itemized quote you can share with your insurer.
Can a slab leak damage my foundation?
Yes. Water under the slab saturates the clay, which swells and can move the foundation. Greenville's Blackland Prairie clay is highly expansive, so fix the leak before any foundation leveling.
Do I need a permit for slab leak repair in Greenville?
Plumbing repair and replacement is permitted and inspected work where the city requires it. The City's Permits and Inspections division reviews applications under the plumbing code the City has adopted.
How can I find out what my water service line is made of?
Search the City of Greenville's 2025 Lead and Copper Rule Revisions service line inventory by street address. It lists each service line as lead, galvanized, non-lead or unknown. It doesn't cover the pipes under your slab; our diagnostic does.
Should I call the City or a plumber about a leak?
If water is running down the street or the pavement is buckling, report it to the City; those are signs of a broken water main. If the street is dry but your meter's leak indicator moves with every fixture off, the leak is likely in your plumbing, so call us at 469-267-2464.
More for Greenville homeowners: Plumber in Greenville · Sewer line replacement in Greenville · Slab leak detection · Sewer line cost calculator