This is one of the most reliable DIY tests for a hidden leak — and if you've already run it, you're closer to an answer than you think.
Turn off every fixture, appliance, irrigation zone, and pool fill valve. Note your meter reading, wait 20–30 minutes without using any water, then check it again.
Any change in the reading during that window means water is passing through the meter somewhere in your system — whether that's a running toilet, an irrigation leak, or a hidden pipe leak.
If you can isolate your irrigation system and toilets and the meter still moves, the leak is most likely in a supply line — which is where professional acoustic or electronic detection becomes valuable.
It's possible but uncommon. A slow, steady movement is far more often a real leak than a faulty meter.
Reasonably urgent — ongoing leaks can cause water damage and cost you money the longer they run undetected.
Let's get you a real answer, not more guessing.