Watch for unexplained increases in your water bill—even a small leak can waste hundreds of gallons monthly. Listen for the sound of running water when all faucets are off, especially at night when the house is quiet.
Check for damp or soft spots on floors, walls, or ceilings. A musty smell often indicates hidden moisture. Outside, look for unusually green or soggy areas in your yard. If your water meter keeps moving when all water is turned off, you definitely have a leak somewhere in the system.