Sign 1: Water bill jumped without explanation
The most reliable single indicator. If your water bill went up significantly (more than 20 percent) and your usage habits did not change, there is almost certainly a leak somewhere. Toilet flapper leaks are the most common cause and waste 100 to 300 gallons per day. Slab leaks can waste much more.
Compare your bill to the same month last year. A 30 to 50 percent jump in summer when you have not added irrigation or pool fill is a clear signal. Call before the leak finds your floor or your slab.
Sign 2: Water meter moves when nothing is on
Turn off every fixture, every appliance, every irrigation zone. Read your water meter, wait 30 to 60 minutes, read it again. If the meter moved at all, you have a leak somewhere in the system.
Florida residential water meters in Orlando typically have a small triangular leak indicator that spins even at very low flow rates. If that indicator is moving when nothing is on, that confirms a leak.
Sign 3: Sound of running water when no fixture is on
Stand in the middle of your house at night when everything is quiet. If you hear a faint hissing or trickling that does not stop, follow the sound. It usually leads to a wall, a slab area, or an appliance line.
Walls feeding kitchens, bathrooms, and laundry rooms are the most common locations. Some homes can have running-water sounds from outdoor irrigation valves that are not fully closed, so check those too.
Sign 4: Warm or wet spots on the floor (slab leak indicator)
A hot-water-side slab leak heats the floor above it. Walk barefoot on different sections of your slab. If one spot is noticeably warmer than the surrounding floor, the hot supply line under that spot is leaking. Cold-water slab leaks show as damp spots without temperature change.
Slab leaks are an Orlando-specific concern because most homes are built on concrete slabs. Catching them early matters. A small slab leak found in week one runs $1,500 to $3,500 to repair. The same leak after a month of soaking the slab and foundation runs significantly more.
Sign 5: Mildew or musty smell with no visible water
Mildew has a distinctive musty smell. If you can smell it but cannot see the source, you have moisture somewhere. Check inside cabinets under sinks, in laundry rooms behind washing machines, in attic spaces above bathrooms.
Florida humidity makes mildew detection harder because everything is slightly damp in summer anyway. The trick is comparing one section of the house to another. If one room smells dramatically worse, the leak is near that room.
Sign 6: Discolored or warped flooring
Hardwood floors that cup, buckle, or discolor near walls indicate water damage from below or from a wall behind. Vinyl or laminate flooring lifts at the seams. Tile floors can show a hairline crack where the moisture migrated.
If the floor damage is concentrated near a kitchen island, a bathroom wall, or a laundry room, the leak is in the plumbing serving that fixture.
Sign 7: Stains on ceilings (often appear and disappear)
A small ceiling stain that gets larger over time is a steady leak from above. A stain that appears and then dries out is an intermittent leak (often related to specific fixture use).
Stains directly under a bathroom upstairs usually mean a fixture or supply leak. Stains under attic-routed plumbing mean a supply line in the attic. Stains under non-plumbed areas mean a roof leak.
Sign 8: Cracks in walls or foundation that grow
Hairline cracks in drywall are normal. Cracks that grow over weeks or months, especially diagonal cracks at door and window corners, can indicate foundation movement from chronic water under the slab. This is the worst-case slab leak scenario.
Combined with any of signs 1 through 7, expanding cracks warrant immediate leak detection.
Sign 9: Water pressure drops in part of the house
If pressure drops at one specific bathroom or one specific floor while the rest of the house is normal, the leak is somewhere in the supply lines feeding that section. Hot-only drop = hot supply line; cold-only drop = cold supply line; both = both lines or a manifold issue.
Sign 10: Unexplained spike in humidity inside the house
A hidden leak adds moisture to the air inside the home. If your AC is running normally but humidity stays high (over 60 percent indoors), look for a leak somewhere. The leak does not need to be large to affect indoor humidity.
Combined with any other sign on this list, high humidity is corroborating evidence. Acoustic leak detection or thermal imaging is the next step.
FAQs
Standard leak detection runs $250 to $450 in Greater Orlando. The visit includes acoustic listening, thermal imaging on slabs, and a meter test. If the leak is found, the detection fee is often credited against the repair work. The detection itself is a worthwhile investment compared to letting an unfound leak cause structural damage.
Sometimes, depending on the policy. Most Florida policies cover the resulting water damage to the home but not the repair of the leak itself. Some policies have specific slab leak endorsements that cover the repair. Read your policy or call your agent before you assume coverage either way.
No. Leaks get worse over time, not better. Sometimes a leak appears to stop because the water has found a new path or because a piece of debris temporarily seals the opening. The underlying problem is still there. A leak that 'fixed itself' will reappear, often worse.
If the leak is large or you can hear active running water, yes. Shutting the main valve buys time while you call a plumber. For slow, low-volume leaks, shutting off the water creates inconvenience but doesn't change the urgency. Either way, get it diagnosed within 24 to 48 hours.
Acoustic listening devices can hear water moving inside pipes through walls and slabs. Thermal cameras detect temperature differences from hot-water leaks. Tracer gas (helium or nitrogen) is sometimes used to pressurize the line and find the escape point. Non-invasive detection is highly accurate when the right tool is matched to the situation.
Bottom line
Most Greater Orlando plumbing problems have a typical cause and a typical fix. The right diagnosis up front saves money on the back end. If anything in this post matches what you are dealing with, a phone call with a licensed local plumber is the fastest path from question to answer. The phone quote is free, and we tell you straight whether your situation needs same-day attention, next-business-day service, or something you can handle yourself with a few minutes of work.
We work all of Greater Orlando across Orange, Seminole, Volusia, Lake, Osceola, and Polk counties. Same-day response for most calls. Around-the-clock dispatch for emergencies. Florida-licensed plumbers, permit-pulled work, firm prices before any work starts. Call (407) 964-8940 to talk to someone now.
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