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Why Is My Water Meter Running When Nothing Is On?

Last updated October 26, 2026

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The short answer

Check the Obvious First

Start with the easiest possibilities. A running toilet is a common culprit, even if you don't hear it. Lift the tank lid and listen for a faint hiss or look for water trickling into the bowl. Also check your washing machine, dishwasher, and ice maker connections for slow drips.

If those look fine, turn off the water at the main shutoff valve. If the meter stops, the leak is inside your home. If it keeps moving, the problem may be between the meter and your foundation, which is often the water utility's responsibility. Note the meter reading, then check it again after half an hour.

Look for Hidden Leaks

Hidden leaks often occur in slab foundations, crawl spaces, or behind walls. Listen for running water near the floor or check for warm spots on a concrete slab, which can indicate a hot water line leak. Also inspect your water heater's pressure relief valve and the area around the tank for moisture.

Another method is to turn off all fixtures, then close the shutoff valves on individual appliances like the washing machine. Watch the meter to see if it slows or stops. If you notice dampness, discoloration, or a musty smell, you may already have water damage that needs professional attention.

  • Look for damp carpet, warped flooring, or ceiling stains
  • Check the water heater for pooling water or rust
  • Inspect outdoor spigots and irrigation lines for leaks
  • Feel the floor near toilets and sinks for unexpected warmth
  • Listen for a faint hissing sound near walls or floors

Test Your Toilets and Fixtures

Toilets are the most common source of phantom water use. A flapper that doesn't seal properly lets water leak from the tank into the bowl constantly. You can test by adding a few drops of food coloring to the tank. If the bowl water changes color without flushing, you have a leak.

Also check your shower valves and sink faucets for drips. Even a slow drip can add up to gallons per day. If you have a pressure-reducing valve or a whole-house filter, ensure it isn't malfunctioning. These small issues are easy to fix with a replacement part or a plumber.

Isolate the Water Supply

To narrow down where the leak is, shut off the water at the main valve, then open a faucet to drain the line. With the water off, note the meter reading. If the meter moves, you have a leak between the meter and the shutoff valve, which may be the utility's responsibility.

If the meter holds steady, turn the water back on and close the shutoff valves for individual areas, like the bathroom or kitchen. Turn off one area at a time and check the meter. This process can help you pinpoint which zone has the problem. If you can't find it, a plumber or water damage pro can trace the issue.

When to Call the Pros

If you've checked the obvious and still see the meter spinning, you may have a leak in a wall, under the slab, or in the sewer line. These are hard to find without special equipment. A plumber can test your lines, but for water damage assessment and cleanup, local water damage pros can help.

If you notice damp drywall, buckling floors, or a musty smell, water damage may already be present. A water damage inspection can identify the source and extent. If the leak has caused contamination, such as from sewage or floodwater, you'll need specialized cleanup. Keep your shutoff valve location written down for future emergencies.

Policies vary, and your insurer decides what is covered. If you file a claim, document the damage with photos and notes. A water damage assessment can provide a detailed report that may help with your claim, but you should check your policy for specifics.

  • Persistent meter movement after all fixtures are off
  • Wet spots on walls, ceilings, or floors
  • Sudden increase in your water bill
  • Mold or mildew growth in hidden areas
  • Low water pressure at multiple fixtures

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Frequently asked questions

How do I know if the leak is inside the walls?

If the meter moves when all fixtures are off and the shutoff valve is closed, the leak is likely in the lines between the meter and the house. To check walls, listen for dripping sounds or feel for dampness. A water damage pro can use moisture meters to locate hidden leaks.

Can a faulty water meter cause it to run?

Yes, meters can malfunction, but it's rare. To test, turn off the main shutoff valve and see if the meter stops. If it continues, the meter itself may be defective. Contact your water utility to have it inspected. They can replace it if needed.

Should I turn off my water if I suspect a leak?

Yes, turning off the main shutoff valve is a smart safety step. It stops the flow and prevents further damage. Then you can investigate without wasting water. If you can't find the leak, call a plumber or a water damage pro to assess the situation.

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