The short answer
Common Causes
The most frequent culprit is a deteriorated washer or O-ring in the faucet handle. Over time, hot water and minerals break down the rubber, so it no longer forms a tight seal when you turn the faucet off. A tiny gap lets water seep through, causing that persistent drip.
Another possibility is a worn valve seat, the metal surface the washer presses against. If it's pitted or corroded, the washer can't seal properly. Hard water in your area can speed up this wear. Sometimes a loose packing nut or a cracked faucet body also allows a slow leak when the handle is closed.
How to Check Yourself
Start by turning off the water supply to the faucet, usually under the sink. Open the faucet to release any remaining water. Then disassemble the handle and remove the valve stem or cartridge, depending on your faucet type. Look at the washer and seat for signs of wear, cracks, or mineral buildup.
If you see damage, replace the washer or the entire valve stem, which is often a simple DIY fix. Clean the seat with a fine abrasive or a seat wrench if it's rough. Reassemble and test. If the leak persists, the problem might lie deeper in the piping or the faucet itself.
- Turn off the water supply before disassembling.
- Open the faucet to drain residual water.
- Inspect the washer and valve seat for wear.
- Replace worn parts with matching sizes.
- Reassemble and test slowly for leaks.
When to Call a Plumber
If you're not comfortable taking apart the faucet, or if the leak continues after replacing the washer, it's time to call a plumber. A plumber can diagnose whether the issue is internal to the faucet or if it's a sign of a larger problem, like high water pressure or corroded pipes.
A professional plumber has the right tools to remove a stubborn valve seat or replace a cartridge that's hard to find. They can also check the water pressure and adjust it if that's contributing to the leak. This keeps the repair from turning into a bigger project.
Potential Water Damage
Even a slow drip can cause damage over time. The water can stain your sink, soften cabinet bases, and encourage mold growth in damp areas. If the leak runs down into the floor or wall, it can weaken wood and drywall, leading to costly repairs.
If you notice water pooling under the sink or discoloration on the cabinet, act quickly. Dry the area and consider having a water damage inspection to check for hidden moisture. In Redmond, the mild marine climate means moisture can linger, so early detection helps prevent bigger issues.
Prevention Tips
Regular maintenance can extend the life of your faucet. Clean aerators and screens to remove mineral buildup, and avoid over-tightening the handle, which puts extra stress on the washer. In areas with hard water, consider a water softener to reduce scale.
Check your faucets for drips at least twice a year. If you live in Redmond, keep the shutoff valve location written down so you can act quickly in an emergency. Catching a small leak early saves you from a larger mess and potential water damage cleanup.
- Clean aerators and screens regularly.
- Avoid over-tightening the handle.
- Inspect washers and O-rings yearly.
- Know your shutoff valve location.
- Address drips as soon as they appear.
Need help right now?
Call (425) 407-5186 any time, day or night, and describe what happened.
Call Now (425) 407-5186Frequently asked questions
Can a leaking faucet cause water damage?
Yes, even a slow drip can cause water damage over time. It can stain sinks, warp cabinets, and promote mold. If the leak reaches the floor or walls, it can weaken structures. Fix it promptly to avoid costly repairs.
Why does my faucet leak only sometimes?
Intermittent leaks often happen because the washer or O-ring is slightly worn, so it seals sometimes but not always. Temperature changes can affect the seal, or mineral deposits may shift. Replacing the washer typically solves it.
Is it safe to use a leaking faucet?
Using a dripping faucet is generally safe for drinking water, but the leak can waste water and cause damage. If you notice water pooling, turn off the supply and get it repaired. Prolonged moisture can lead to mold, which is a health concern.