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Why Does My Outside Faucet Keep Running?

The outside water faucet is turned off but water keeps running. What do I need to do to fix this problem?

When an outside hose bib runs even when the handle is shut off, it means either the gasket needs to be replaced or the valve seat has gone bad. The seat is the brass opening that the gasket closes against. Leaking water can cut a microscopic channel in the surface of the brass. If the seat is damaged, you need to replace your exterior faucet’s hose bib since most seats are molded into the faucet and are not replaceable.