A persistent drip from your sink faucet is more than an annoyance; it is a waste of water and a sign that internal components are wearing out. Addressing the issue promptly can prevent higher water bills and more extensive damage under the sink. This guide provides a clear, step-by-step approach to diagnosing and fixing a leaking sink faucet.
Understanding the Source of the Leak
Before reaching for tools, you must identify where the water is escaping. The location of the leak often points directly to the faulty part. Leaks typically originate from the base of the spout, the handles, or the point where the faucet connects to the wall supply lines.
Spout Leaks
If water streams from the tip of the spout even when the handle is off, the internal cartridge or valve seat is likely failing. This is the most common type of faucet leak and usually requires disassembly to access the worn components.
Handle and Base Leaks
Moisture around the handle suggests that the O-ring or seal behind it has deteriorated. Conversely, water seeping from the top of the faucet body, where the handle sits, often indicates a damaged stem or packing nut. These issues are common in older compression faucets.
Gathering the Right Tools
Success depends on having the correct equipment. Using improvised tools can strip screws and damage ceramic discs, turning a simple repair into a costly replacement. A well-prepared toolkit ensures efficiency and protects your fixture.
Adjustable wrench or basin wrench
Phillips and flathead screwdrivers
Allen wrench set (for cartridge faucets)
Plumber's tape
Needle-nose pliers
Towels or rags
Shutting Off the Water Supply
Safety is the first step in any plumbing repair. Attempting to fix a leak while water is flowing creates a mess and risks injury. Locate the isolation valves under the sink and turn them clockwise to stop the flow.
If your valves are stuck or if you have an old system without dedicated valves, you may need to shut off the main water supply to the house. Once the water is off, open the faucet briefly to drain the remaining water from the lines before beginning work.
Disassembling the Faucet
The disassembly process varies significantly based on the faucet type. Identifying your model—compression, cartridge, ceramic disk, or ball—is crucial. Look for set screws located under decorative caps on the handles or at the base of the spout.
Remove the handles carefully to avoid scratching the surface. Once the handles are off, you will see the stem or cartridge. Use a wrench to loosen the retaining nut, and proceed slowly to avoid dropping small internal parts into the drain.
Inspecting and Replacing Parts
Examine the removed components for visible damage. Rubber O-rings and washers are common culprits; they harden and crack over time, leading to compression leaks. Cartridges and ceramic disks should be checked for cracks or mineral buildup that prevents a proper seal.
