Are your water bills rising suspiciously even though you're not using more water? Here's how to investigate and track down a leak that's robbing you blind. First start with the usual suspects. You know what they are -- dripping faucets, running toilets -- your everyday petty water thieves. If they're not the culprits, and you can't find any telltale puddles or wet spots on floors or ceilings below (signaling a leaking pipe or connection), then it's time to step up your investigation (with some sneaky surveillance techniques). To determine if there's a leak in the line coming into your house, turn off the water where it enters your home. Note the reading on the water meter and then go take a break -- shopping or whatever. Later, when you come home, check again. If the meter reading has changed, you've found the leak. If it hasn't, you've got a mystery on your hands that might require the services of a plumber. And that's the On The House tip for today.