Laundry Faucet Leaking: Common Causes and Repair Steps

Why a Laundry Faucet Leaks

A laundry faucet leaking is usually caused by worn internal parts, loose connections, or mineral buildup that prevents a valve from closing fully. The faucet may drip from the spout, seep around the handle, or leak at the supply line. Pinpointing where the water escapes narrows the fix. A drip from the spout often points to a degraded washer or cartridge. Moisture around the base or handle suggests a failing O-ring or packing nut. A leak at the supply connection typically means a loose fitting or a damaged supply line.

Tools and Materials You Will Need

• Adjustable wrench
• Screwdriver set
• Replacement washer, O-ring, or cartridge
• Plumber's tape
• Towel or bucket
• Vinegar or descaling solution

How to Diagnose the Leak

Start by drying the faucet thoroughly with a towel. Run the water and observe where drops form first. Check the spout, the handle base, and the supply connections at the wall and at the faucet inlets. Place a dry paper towel around each joint; moisture will leave a clear trace. If the leak only appears when the handle is turned, the internal valve is the likely culprit. If it seeps without any water running, the supply line or connection is suspect.

Repairing a Leaking Spout

Turn off the water supply valves under the sink. Open the faucet to release remaining pressure. Remove the handle screw and pull off the handle. Unscrew the packing nut and extract the stem. At the base of the stem you will find a rubber washer or a cartridge. Inspect it for cracks, flattening, or mineral deposits. Replace the washer with an exact match, or swap the entire cartridge. Reassemble in reverse order, tightening the packing nut firmly but not excessively. Turn the supply back on and test.

Fixing Leaks Around the Handle or Base

Moisture around the handle is often a worn O-ring or a loose packing nut. Remove the handle and locate the O-ring near the base. Slide it off, note its size, and replace it with a new one of the same diameter and thickness. For a leak at the packing nut, wrap the stem threads with fresh plumber's tape and tighten the nut. If the faucet body itself is cracked or corroded, no repair will hold, and replacement is the better choice.

Addressing Supply Line Leaks

A leak where the supply line meets the faucet or the wall valve is often a failed washer inside the fitting or a loose connection. Tighten the joint with an adjustable wrench, but stop when resistance increases to avoid cracking the brass. If the washer inside the fitting is damaged, replace it. For flexible supply lines, check for bulges or pinholes and replace the entire line if compromised. Always turn off the water before working on supply connections.

Preventing Future Leaks

Regular maintenance extends the life of a laundry faucet. Clean the aerator every few months to reduce mineral buildup. Inspect supply connections for moisture after each laundry cycle. Avoid over-tightening the handle, which can compress and damage internal parts. In hard-water areas, consider a whole-house water softener to reduce scale. Catching small drips early prevents the steady water waste and higher utility bills that come with a persistent leak.

When to Call a Professional

If the leak persists after replacing washers, O-rings, or cartridges, the faucet body may be damaged or the valve seat may be corroded. A plumber can assess whether the seat needs resurfacing or if a full faucet replacement is the most cost-effective solution. Call a professional promptly if you notice water pooling under the sink, as prolonged moisture can damage cabinetry and encourage mold.