Did you realize that a leaky faucet can waste up to $100 worth of water? And that's only a small blemish. A larger faucet leak can waste up to 30 gallons of water every day, putting a strain on your finances. We've collected a list of 5 reasons for leaky faucets and how to fix them to help you save money. An inner stem, also known as a cartridge, controls the flow of water in all faucets. Rubber or neoprene washers or seals on this stem or cartridge open and close against water entry openings inside the faucet body. When these seals aren't tight enough, a small amount of water leaks up to the faucet spout, causing that annoying and wasteful drip. You can always hire an emergency plumber to fix your leaky faucet.