One of the most common things we hear on a first call is some version of the same sentence: the meter is still running even with the water off inside the house. It's a genuinely useful piece of information, and checking it yourself before calling is one of the best things a homeowner can do. But it doesn't always mean what people assume it means, and the follow-up questions matter as much as the observation itself.
How To Actually Check Your Meter
Turn off every fixture in the house, including anything automatic like an ice maker line or an irrigation timer. Locate your water meter, usually in a box near the curb or property line, and check the small leak indicator dial, a red or black triangle or gear-shaped icon that moves whenever any water is flowing through the line. If that indicator is moving with everything off, water is going somewhere between the meter and your home, or somewhere inside the home you haven't accounted for.
The most common thing people forget to check is a toilet that's running silently. A worn flapper doesn't always make an audible sound, and a toilet can run continuously for hours without anyone noticing until the water bill arrives. Before assuming a hidden leak, it's worth listening at each toilet or dropping a bit of food coloring in the tank to see if it appears in the bowl without flushing.
What It Means If You've Ruled Out The Obvious
Once toilets, faucets, and any irrigation system are confirmed off and the meter is still moving, the leak is somewhere in the supply line between the meter and the house, or inside a wall or under the slab. This is exactly the situation electronic leak detection is built for, since the leak is by definition not visible or you would have already found it.
A related version of this same call involves a water bill that jumped without anyone noticing a change in usage. That's effectively the same signal read a different way. Instead of catching the meter in the act, you're seeing its cumulative effect on a monthly statement. Either way, the underlying question is the same: is water leaving the system somewhere it shouldn't be.
Why This Symptom Gets Treated As A Real Emergency, Not A Minor Inconvenience
A slow leak that's been running for weeks can waste thousands of gallons before it's caught, and depending on where the leak is, it can also be quietly causing damage the whole time, whether that's saturating soil near a foundation or warming a section of slab from underneath. The dollar cost of the wasted water is usually smaller than the cost of the damage a long-running leak causes if it goes undetected for months.
This is also one of the few plumbing symptoms where the caller usually doesn't know what's actually wrong yet, only that something is. That's a normal starting point, not a problem. Diagnosis is the first step precisely because the meter test only tells you that a leak exists, not where it is or what's causing it.
What To Have Ready When You Call
Note your meter reading, how long you let it sit with everything off, and whether the leak indicator was moving the whole time or intermittently. Check your last two or three water bills if you have them handy. That information helps narrow down whether this is a new problem or one that's been developing gradually, which changes how urgently it needs to be addressed.
A Few Other Things Worth Checking First
An irrigation system on a timer is a common source of confusion, since a stuck valve can let water run underground without ever reaching a visible sprinkler head. If you have irrigation, shut off the main valve to that system specifically before doing the meter test, not just the timer controller, since a timer being off doesn't guarantee the valve itself has fully closed.
A water softener that's mid-regeneration cycle will also use water briefly, so if your softener happens to be running its cycle during the test, wait twenty minutes and check again. Ice makers and evaporative coolers, where still in use, are two more easily overlooked automatic water users worth ruling out before assuming the leak is somewhere less obvious.
When This Turns Out To Be Nothing Serious
Not every meter test leads to a major repair. Sometimes the cause is a single running toilet that's easy to fix in one visit, or a softener valve that needs a minor adjustment. We treat the initial call the same way regardless of how it turns out, since there's no way to know in advance whether a moving meter means a five-minute fix or a slab leak, and the diagnostic process is the same either way until the cause is actually confirmed.
Either outcome is better than not checking at all. A homeowner who catches a running toilet early spends far less over a year than one who assumes a slightly higher bill is just normal fluctuation. The meter test costs nothing and takes ten minutes, which makes it worth doing periodically even without a specific reason to suspect a problem, simply as a habit alongside checking smoke detector batteries or an HVAC filter twice a year.
If you do call and the cause turns out to be something small, that's a good outcome, not a wasted visit. Finding out a running toilet was the whole story is far better news than discovering the same symptom six months later attached to a much larger repair, and there's no way to know which one you're dealing with until someone actually looks.
Meter Still Moving With Everything Off?
That's worth a call, even before you know what's causing it.