If your monthly water bill is higher than normal but your water usage has remained steady, you could have a leak. To find out, turn off all faucets and any appliances that use water, like your dishwasher. Then, go to your water meter and watch it. If the meter is moving, there's water flowing somewhere in your house. Translation: You’ve got a leak. This is one problem that needs fast attention. Shut off the water and call your plumber.