Short definition
The water meter is the utility-installed device that measures every gallon of water entering your house. It sits at the property line — usually in a buried meter pit, sometimes inside a basement closet — between the curb stop and the inside main shutoff. Reading it with all fixtures off is the classic whole-house leak test.
What it is
Inside the meter, a positive-displacement mechanism, turbine, or modern ultrasonic sensor counts the water passing through. Older mechanical meters drive a register with rotating digits; modern smart meters add a radio transmitter that lets the utility read remotely without sending a crew. Most US residential meters report in cubic feet, hundred cubic feet (CCF), or gallons depending on the utility — Seattle Public Utilities and Tacoma Water typically bill in CCF (1 CCF = 748 gallons).
The meter is owned and maintained by the water utility. You don’t service it yourself, and tampering with it generally violates utility rules.
Why it matters to a homeowner
Three practical uses:
- Locating your inside main shutoff. Find the meter, walk straight from it toward the house wall, and the inside main shutoff is almost always on the supply pipe just inside the foundation.
- Whole-house leak test. Turn off every fixture and appliance. Look at the meter dial — most have a small leak indicator (a triangular or star-shaped marker) that spins on any flow at all. If anything moves, you have a leak somewhere on your side.
- Bill spike investigation. Read the meter at the same time daily for a week — the gallon-per-day swing tells you whether usage really jumped or the bill is wrong.
Smart-meter rollouts in the past several years (SPU, Tacoma Water, others) mean homeowners can now see daily and even hourly usage on the utility’s portal, which makes leak diagnosis dramatically faster than the old monthly bill cycle.
Common variants and what the meter is not
- Standard mechanical meter vs. smart (AMR/AMI) meter. Smart meters transmit by radio; mechanical meters are read by a crew on foot.
- Indoor meter vs. meter pit. Most modern WA installations are in pits; some older Seattle and Tacoma multi-family stock has indoor closet meters.
- Water meter vs. submeter. Some condos and ADUs install submeters for individual unit billing; those aren’t the utility-billed primary meter.