An outdoor water faucet can leak due to a loosened nut, damaged pipe or worn-out handle components and washer. Deposition of debris and minerals in the faucet pipe or spout can also lead to leakages even with the faucet in an off position.
One common cause for outdoor faucet leakages is loosening of the nut that secures the faucet-pipe connection. To fix this problem, tighten the nut with a wrench. If the nut feels stiff when you tighten it, wipe any accumulated debris off its threads, and lubricate it. If the nut is damaged, replace it with a new one.
Frozen water in the faucet pipe can cause the pipe to split. In such a case, detach the taps at the bottom and top of the pipe using a wrench, and replace the pipe with a new one.
If the cause of water leakage from the outdoor faucet is not apparent, check its inner components. If the faucet's handle feels too loose or tight when turned, it indicates wearing out of the handle's components. Detach the handle from the faucet using a screwdriver or wrench, identify the worn out components, and replace them with new ones.
Often, the faucet's washer wears out with use. To replace the washer, detach the faucet's handle, remove the old washer, clean the washer area, and replace it with a new washer of the same size.
To clean the outdoor faucet, disassemble it, and scrub the pipe and spout using a brush. Use a small amount of white vinegar to get rid of the mineral deposits. Finally, rinse the faucet components with clean water, and reassemble them.