What to Do When Your Water Meter Keeps Spinning

That spinning dial on your water meter is one of the most alarming sights a homeowner can face — but it's also one of the most useful. It's telling you, clearly and undeniably, that water is moving through your system right now. Your job is to figure out where. Here's exactly how to do that.

Step 1: Confirm It's Real

Turn off everything that uses water. This means: all indoor and outdoor faucets, all toilets (make sure they're not running), the washing machine, the dishwasher, the ice maker, your irrigation system (turn it off at the controller AND at the backflow preventer), and your pool auto-fill if you have one. Wait 5 minutes. Now check the meter.

Most residential water meters have a small triangular or gear-shaped dial called a "leak indicator" or "low-flow indicator." If that dial is spinning — even slowly — water is flowing. Period. No exceptions. If the indicator is completely still, your leak (or whatever caused the high bill) is intermittent — still worth investigating, but not an active continuous flow.

Step 2: Rule Out the Easy Stuff First

Before you call a specialist, eliminate these common culprits. They cost almost nothing to fix:

Toilets

A silently running toilet can waste 200–5,000 gallons per day. You won't always hear it. Put 3-4 drops of food coloring in each toilet tank. Wait 15 minutes. If any color appears in the bowl (without flushing), that flapper needs replacing. $10 part, 10-minute fix. Check every toilet in the house — including guest bathrooms you rarely use.

Irrigation System

Turn off the irrigation at the backflow preventer (the brass device near your water meter). Check the meter again. If the spinning stopped, the leak is in your irrigation — a cracked head, cut drip line, or stuck valve. Walk each zone manually and look for soggy areas, low-pressure heads, or geysers.

Hose Bibs & Outdoor Faucets

Check every outdoor faucet. Is one dripping? Is a hose still attached with a spray nozzle that's slightly open? Walk the perimeter of your house. A slow drip at a hose bib adds up over a month.

Step 3: Shut Off the House (The Isolation Test)

If the meter is still spinning after ruling out toilets and irrigation, the leak is between the meter and your house (the service line) or inside your house (plumbing or slab leak). Here's how to narrow it down:

1. Locate your main water shut-off valve (usually on the outside wall facing the street, in the garage, or in a utility closet).
2. Turn it off completely.
3. Check the meter. If the leak indicator stopped spinning, the leak is inside your house — after the shut-off valve. If the indicator is still spinning, the leak is in the service line between the meter and your shut-off valve (an underground leak outside your home).

Both scenarios require a professional — but knowing which one helps us deploy the right equipment from the start.

Step 4: Call a Leak Detection Specialist

At this point, you've done everything a homeowner can do. The leak is either underground (service line), in your slab, behind a wall, or in a place you can't see or reach. You need professional water leak detection equipment.

When you call, tell us:

• Did the meter stop when you shut off the house valve? (Tells us inside vs. outside)
• How fast is the leak indicator spinning? (Fast spin = big leak, slow spin = small leak)
• How much did your bill increase? (In dollars or gallons, if you know)
• Any other signs? (Warm floor spots, water sounds, damp areas?)

This information helps us show up with the right tools and get straight to work. We serve all of Phoenix Metro and Southern Arizona. For more on what causes spikes, see our guide on why your water bill is so high.