A sudden spike on your Miami water bill almost always means a hidden leak running 24 hours a day. Water that should stay in your pipes is escaping somewhere you cannot see, and the meter keeps counting every gallon. The most common culprits are a running toilet, a dripping or burst supply line, or a slab leak under your foundation.
What are the most common causes of a high water bill?
Most sudden increases trace back to a few issues. A running toilet can quietly waste thousands of gallons a month. A dripping or burst supply line leaks day and night. A slab leak under your concrete can waste 10,000 or more gallons a month while staying completely hidden.
Running toilets and supply lines
These are the leaks you can sometimes hear or see. A toilet that hisses or refills on its own is wasting water around the clock. Flexible supply lines under sinks and behind toilets can split with age, and a burst line can run continuously until someone notices the damage.
How can I tell if I have a hidden leak?
Hidden leaks are easy to miss because there's rarely any visible water. The giveaway is usually your bill or your meter, not something you can see. A bill that spikes with no change in usage, or the sound of running water when every fixture is off, both point to water escaping somewhere in the system. Confirming it and finding the exact spot takes professional equipment, not guesswork.
Could it be a slab leak?
It could, especially if your meter keeps moving after you have ruled out toilets and fixtures. A slab leak hides in the water lines running under your concrete foundation and can waste 10,000 or more gallons a month. Warning signs include unexplained warm floor spots, a drop in water pressure, the sound of running water, or moisture seeping up through the floor.
Slab leaks need professional tools to confirm and locate. Our slab leak detection and repair team pinpoints the exact spot so the fix stays small instead of tearing up your whole floor.
How do I find a hidden water leak without tearing up my house?
You usually cannot find a hidden leak with the naked eye, which is where professional leak detection comes in. We locate leaks to within about six inches non-invasively, using sonic listening equipment, thermal imaging, and tracer-gas testing. That means we find the problem precisely before any concrete, drywall, or landscaping gets disturbed.
When should I call a plumber?
Call a plumber as soon as your bill spikes without explanation, a toilet keeps running, or you notice warm spots, low pressure, or pooling water. The longer a hidden leak runs, the more it costs and the more damage it does. A licensed pro finds the source and stops the waste fast.
Diamond Plumbing has served Miami-Dade and Broward County since 1999 under Florida license CFC1431243. Whether you need a plumber in Miami or in Kendall, our team is available 24/7. Start with our high water bill help page when your costs jump without explanation.
Frequently asked questions
Can a running toilet really raise my water bill that much?
Yes. A single running toilet can waste thousands of gallons a month, and the leak is often silent: most homeowners don't notice until the bill arrives. A quick inspection confirms it, and replacing the worn flapper usually stops the waste.
How much water can a slab leak waste?
A slab leak can waste 10,000 or more gallons a month while staying hidden under your foundation. Because it runs nonstop, it shows up fast on your bill. Professional detection locates it to within about six inches so repairs stay targeted.
Is leak detection invasive?
No. We locate leaks non-invasively using sonic, thermal, and tracer-gas tools, pinpointing the source to within about six inches before any digging or cutting. That protects your floors, walls, and landscaping while still finding the exact problem.