Water Meter Running With No Water On? Find the Leak

Close the main shutoff valve where your water line enters the house and watch the meter. If the dial stops, the leak is inside your walls or fixtures. If it keeps moving, the water is escaping somewhere between the meter and that valve. That one check cuts the search in half, and the full two-hour test below confirms it.

What does a moving water meter mean when nothing is running?

It means water is passing through the meter, so something on your side of it is using or losing water. Many meters have a small leak indicator, usually a triangle, star, or tiny dial, that spins at even a trickle of flow. If it's turning while every faucet is closed, treat it as a leak until you prove otherwise.

Leaks add up quietly. EPA WaterSense estimates the average household loses nearly 10,000 gallons a year to leaks, and a running toilet can waste roughly 200 gallons a day.

A few harmless things can move the dial: an ice maker refilling, a water softener regenerating, an irrigation timer, or a slight creep from thermal expansion after a water heater cycle. That's why the test below has you shut those off first. Rarely, the meter itself is faulty, but rule out leaks before you blame it.

How do you run the two-hour meter test?

Stop all water use, record the meter reading, wait two hours without using any water, and read it again. Any change means a leak.

1. Turn off the dishwasher, washer, ice maker, softener, and irrigation timer, and tell everyone not to flush.
2. Lift the meter box lid with a screwdriver, wearing gloves. Spiders and wasps like these boxes.
3. Write down the full reading and photograph it. Many meters read in cubic feet, and one cubic foot is about 7.5 gallons.
4. Wait two hours with no water use, then read it again. If you're short on time, a spinning leak indicator already answers the question.
5. Now close the main shutoff valve at the house and watch the indicator for 10 to 15 minutes.

That last step splits your problem cleanly:

Is a running or leaking toilet the most common cause?

Yes. A worn toilet flapper that lets water seep from the tank into the bowl is the most common reason a meter moves with nothing on.

Test it. Put about 10 drops of food coloring or a dye tablet in the tank, don't flush, and wait 15 minutes. Color in the bowl means the flapper isn't sealing. Many of these leaks are silent, so don't count on hearing anything.

Our pick for the first repair is a new toilet flapper. It runs about $5 to $20, takes ten minutes, and needs no tools. If the tank water keeps rising and trickles into the overflow tube, replace the fill valve instead, typically $10 to $30. To confirm the fix, close that toilet's stop valve and recheck the meter. If the dial stops with the valve closed, that toilet was your leak. EPA WaterSense publishes leak-check guidance if you want a second reference.

Should you check irrigation, hose bibs, and outdoor valves?

Yes, because outdoor leaks are a frequent source and they hide well. Start with the irrigation system: a zone valve stuck partly open, a cracked drip line, or a leaking backflow preventer can all move the meter while the timer shows nothing running.

Look for soggy ground, unusually green patches, or water pooled in valve boxes. Shut off the irrigation supply and retest the meter. Then check every hose connection. A hose left attached to a sprayer or a pool auto-fill can drip all night.

A frost-free hose bib can also leak inside the wall where you can't see it. If water drips from the spigot after you shut it off, or you find a damp spot on the interior wall or in the crawl space near it, the valve seat or the stem is failing. Replacing one runs roughly $150 to $400 from a plumber, less if you're comfortable sweating copper or using push-fit fittings.

Can the water heater and fixtures cause a moving meter?

They can, and the water heater is worth checking early. Look at the temperature and pressure relief valve and its discharge pipe for drips, and check the tank base and the supply connections for moisture or rust trails.

A relief valve that weeps often points to high house pressure or a failed expansion tank rather than a bad valve. Thread a water pressure gauge, about $10 to $20, onto an outdoor spigot with no water running. Readings above roughly 80 psi are too high, and many plumbing codes use that figure as a ceiling. A failing pressure-reducing valve at the main is a common reason, and replacing it is plumber territory, usually with a permit.

Then work through the small stuff. A faucet dripping once per second can waste around 3,000 gallons a year, so check each one. Look under sinks at the supply lines, behind the washing machine at the hoses, and at the ice maker line, humidifier, and softener. Dry a connection with a paper towel and see if it's wet again in ten minutes.

How do you know the leak is in the underground service line?

If the meter keeps moving with the main shutoff valve closed, the leak is in the service line. Other signs back it up: a hissing sound at the meter or the valve, a soft or sunken spot in the yard, a patch of grass that stays green in dry weather, unexplained low pressure, or water showing up in the meter box.

You can't repair this one casually. Call 811 before anyone digs, because gas, electric, and communications lines often run along the same path. Ownership matters too: in many places the utility owns the line up to the meter and you own everything from the meter to the house, but that varies by utility and by state. Call your utility and ask exactly where its responsibility ends.

A leak detection service, typically $150 to $600, can pinpoint the break with acoustic equipment so the trench is short instead of exploratory. Repairing a section commonly lands between $1,500 and $6,000, and full replacement can run higher with long runs, driveways, or sidewalks in the way. Service line work usually needs a permit and sometimes an inspection, so ask your local building department or utility, and expect a licensed plumber or contractor to handle it. If the line is old galvanized steel or failing copper, ask your plumber about replacing it with modern copper or PEX rather than patching it again.

When should you call a plumber or the utility?

Call a pro when the meter moves with the main valve closed, when you can't find a leak after checking every fixture, or when you see water in the yard, a damp slab, or a warm spot on the floor. Warm spots can mean a leaking hot line under the slab.

Make two calls before the repair bill arrives. First, ask your water utility whether it offers a leak adjustment on a high bill. Many do, with rules that vary by provider and usually require proof of repair. Second, ask your insurer what's covered. Sudden interior pipe breaks are often covered, while slow leaks and underground line failures often aren't without an added endorsement, and the details vary by policy and state. The National Association of Insurance Commissioners points you to your state regulator if a claim goes sideways.

Get any plumber's diagnosis and estimate in writing, and keep photos of your meter readings. Your next step: run the two-hour test today, write down the reading, and add a quarterly meter check to your seasonal home maintenance list.