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A sudden jump in your water bill almost always has a knowable cause, and most of the time it isn’t a slab leak. A stuck toilet fill valve, left unnoticed, can waste up to 4,300 gallons of water a day and add as much as $1,400 to a single month’s water costs, according to the U.S. Environmental Protection Agency’s WaterSense program, which is often enough by itself to explain a spike that has nothing to do with hidden plumbing damage. Before assuming the worst, a handful of ordinary explanations (a worn toilet flapper or stuck fill valve, an irrigation timer left on too long, more people staying at the house, a new appliance, or a rate increase from your water utility) are worth ruling out first.
If none of those explain it, a simple water-meter test can confirm whether water is being used somewhere in your system before you call anyone.
Before assuming a leak, rule out the ordinary explanations: a running toilet or worn fill valve, an irrigation timer left on too long, more people staying at the house, a new water-using appliance, or a rate or tier increase from your water utility.
If none of these five explain the spike, the next question is whether a leak, rather than ordinary use, is behind it.
A hidden leak becomes the more likely explanation once the ordinary causes above are ruled out and usage still looks abnormally high. A slab leak, a break in a supply line running under your home's foundation, is one possibility, and it often (though not always) comes with a warm spot on the floor or the sound of running water when everything is off; see our full slab leak signs and symptoms checklist for the complete list.
A running toilet flapper sits in a gray area here too: it's not a structural leak. If it's been running unnoticed for weeks, it can produce a bill spike large enough to look exactly like one. Either way, a bill spike alone doesn't confirm which of these it is, which is exactly why the self-check below matters before anyone assumes a worst-case answer.
Here's a simple way to check for a hidden leak yourself: turn off every faucet and appliance that uses water, find your water meter, note the reading, wait 30 minutes without using any water, then check the meter again. If it moved, something is using water somewhere in the system.
If the reading moved with everything off, water is being used somewhere in the system, though this test alone doesn't tell you where. If it didn't move, revisit the non-leak causes above, or check whether the bill period itself covers an unusual number of days. Either way, this test costs nothing and takes half an hour, which makes it worth doing before booking anything.
That's the point where detection equipment beats more guessing. We pinpoint where the water is going.
A one-month spike and a permanently high water bill are different problems. A spike that corrects itself was usually an event: a guest, a filled pool, an irrigation cycle left running. A bill that stays high month after month is a leak until proven otherwise, because nothing else runs continuously without you noticing.
The tell is consistency. Leaks do not take weekends off, so a leak-driven bill climbs by a similar amount every cycle rather than jumping once and settling.
Where those leaks hide is worth knowing, because the ones that inflate a bill quietly are rarely the ones you can see. A pinhole leak in a copper line inside a wall can run for months. A concealed leak above a ceiling shows as a stain long after the water started. Neither leaves a puddle to find.
Both take minutes and both make the visit shorter.
People often ask how to save on water bill costs generally, and the honest answer is that fixing an active leak dwarfs every other saving available. Once the leak is gone, the ordinary measures matter again. While it is running, they are noise.
If the meter test says water is moving, the next step is locating it precisely rather than opening walls to look. That visit is a flat-rate detection fee agreed in advance, carries our no-find-no-fee guarantee, and produces a firm written quote before any repair begins.
Call a professional once the meter test shows movement with everything off, or once you've ruled out every ordinary explanation and the bill still doesn't make sense. At that point, non-invasive detection can pinpoint exactly where the water is going, using the same acoustic, thermal, and pressure-testing equipment described on our slab leak detection and repair page, and if we can't locate the leak, there's no detection fee.
A detection visit is a flat-rate $150 to $500, credited toward the repair if you move forward; see our slab leak repair cost guide for what happens after that. There's no need to wait for visible damage before calling, since catching a leak earlier generally means a smaller, less disruptive repair later.
Contact us to schedule a detection visit if your own meter test confirms something is running; scheduled visits and quotes run Monday through Saturday, 7am to 6pm. If what you're seeing is active flooding or a burst pipe right now, our 24/7 emergency line is answered day or night, in English or Spanish.
Once the meter test says water is escaping, the question stops being whether and becomes where, and the answer should come from equipment rather than from opening things up.
Acoustic listening picks up the sound of water escaping a pressurised line and follows it to its loudest point, which is what locates most supply-line failures. Thermal imaging reads the temperature signature escaping water leaves in a floor, wall or ceiling, and confirms or corrects the acoustic result. Where several lines run close together, pressure testing isolates each one and identifies which will not hold. Where all three leave doubt, tracer gas is introduced into the drained line and detected at the point it surfaces.
Between them, a leak becomes a marked spot rather than a search. The repair that follows carries a 2-year workmanship warranty, which is the part of the bill you should be able to stop worrying about.
If water is running with everything off, we pinpoint exactly where. No detection fee if we can't find it.
(714) 386-7923Call or text, day or night Get a Leak CheckedIt doesn’t take much. A stuck toilet fill valve can waste up to 4,300 gallons a day on its own, per the EPA’s WaterSense program, and a slab leak can run continuously around the clock, so either one can show up clearly on a single billing cycle even without any change in how you use water day to day.
Yes. A slab leak in particular can run for a while before a warm floor spot, a sound of running water, or a wet yard patch becomes noticeable. See our full slab leak signs and symptoms checklist for what to watch for even when nothing looks obviously wrong yet.
A slab leak is worth addressing promptly, but it’s rarely an instant emergency the moment it’s suspected. It’s a leak worth diagnosing and fixing without unnecessary delay, not a reason to panic before you’ve even confirmed one exists.
That’s exactly the situation non-invasive detection is built for. We locate the leak using acoustic, thermal, and pressure-testing equipment, and if we can’t find it, there’s no detection fee, so confirming the “where” carries no wasted-money risk on your end.