A water bill that's noticeably higher than usual, with nothing about your household's routine having changed, is one of the most reliable early signs of a leak that exists. It's also one of the most commonly ignored, because a bill increase doesn't come with an obvious cause the way a wet ceiling does. People assume it's a rate increase, a longer billing cycle, or just normal variation, and by the time they investigate, the leak has often been running for months.
The good news is that confirming or ruling out a leak doesn't require a professional visit as a first step. Your water meter is designed to answer exactly this question, and checking it takes about twenty minutes.
Find your meter and learn its leak indicator
Most residential water meters have a small triangular or star-shaped dial, sometimes called a leak indicator, that spins whenever any water is flowing through the meter, even a trickle. On digital meters, there's often a small leak icon or flow-rate readout instead. Locate your meter, usually in a pit near the curb or in a utility area, and identify which indicator your specific meter uses before you start the test.
Run the test
If nothing changed, that's a genuinely useful negative result, it means there's no active, continuous leak at the moment, though it doesn't rule out an intermittent one like a toilet that only occasionally runs.
Why toilets are the most common false lead and the most common real cause
Toilets are responsible for a large share of both hidden leaks and confused test results. A worn flapper can leak silently and intermittently, sometimes only after a flush, which won't show up in a single twenty-minute meter test if it happens to be in a quiet phase. A simple secondary check: put a few drops of food coloring in the tank, wait ten minutes without flushing, and check the bowl. Color in the bowl means the tank is leaking into it even when nobody's used it.
What a positive result actually tells you, and what it doesn't
A moving meter confirms water is flowing somewhere in your plumbing system, but it doesn't tell you where. That could be a running toilet, an underground irrigation line, a slab leak, or a supply line inside a wall. This is exactly the situation acoustic and thermal leak detection equipment exists for: narrowing a confirmed leak down to a specific location without guessing or opening walls speculatively. The meter test's real value is telling you whether it's worth calling someone at all, not diagnosing the exact spot yourself.
Meter confirmed a leak but you can't find the source? That's exactly what a professional leak detection visit is for.
Call (720) 698-9956What professional equipment adds beyond the meter test
The meter test tells you whether water is flowing somewhere it shouldn't be. It can't tell you where. Acoustic listening equipment picks up the specific sound signature of pressurized water escaping a line, even through a slab or inside a wall, and can narrow a leak's location to a small area before anyone opens anything. Thermal imaging adds a second, independent data point by showing temperature differences where hot or cold water is migrating through material it shouldn't be in. Using both together, rather than relying on either alone, is what keeps a leak search from ending up at the wrong wall, which does happen when a single method picks up interference from something unrelated, like nearby HVAC ductwork or a water softener's regeneration cycle.
How often it is worth repeating the test
A single clean twenty-minute test is a reasonable snapshot, but it will miss a leak that only occurs intermittently, such as a toilet that runs just once every hour or two. If your bill keeps climbing despite a clean short test, repeating it overnight, or over several hours rather than twenty minutes, dramatically improves the odds of catching an intermittent leak that a quick daytime check would miss entirely.