Every connection in your waterline has the potential for a leak, especially if pipes are old or exposed to freezing temperatures. Pipes that are located in vanities or cupboards under sinks should be checked periodically for leaks. Supply lines to toilets should be checked for water dripping at the connection to the tank. If crawl spaces are accessible, you can check for pooling water under your house indicating a possible leak. Not all drips are indications of a leak, condensation may form on cold water supply lines.
Faucets: Most leaks result from worn washers which allow faucets to drip or leak. Faucets, as well as hose bibbs or seldom used taps in crawl spaces or basements, should be checked periodically.
Toilets: Flappers that are worn and do not close properly will allow for water to leak unnecessarily into the toilet bowl. Usually you will hear the water trickling intermittently from the tank to the bowl. If you do not hear water leaking, you can test the flapper by placing a few drops of food coloring in the tank. Wait for about 20 minutes without flushing. If the food coloring appears in the bowl, then your toilet has a silent leak.