Why your kitchen faucet drips even when it's fully off
Inside every kitchen faucet, there's a mechanism designed to press a seal tightly against a valve seat — and when that seal is working correctly, no water gets through. When a faucet drips, it means that seal can no longer hold. Depending on your faucet type, that seal might be a rubber washer, an O-ring, a ceramic disc, or a spring-loaded ball assembly — but the underlying story is always the same: something that was once pliable and snug has worn down, hardened, or distorted, and water is slipping past it under the pressure sitting in your pipes.
The most common culprits are a degraded rubber washer in a compression-style faucet, a worn cartridge in a single-handle faucet, or a cracked ceramic disc in a newer lever-style model. Mineral deposits from hard water accelerate the process considerably — calcium and magnesium build up around the valve seat over time, preventing a perfect seal even when the rubber itself isn't completely shot. If your home has hard water and the faucet has been in place for several years, that combination is usually what tips a borderline seal into a constant drip.
It's worth knowing that the drip rarely fixes itself and almost never stays at the same rate — it tends to worsen gradually as the worn component degrades further under repeated use and continuous water pressure. Catching it early means a simpler, cheaper repair.
A dripping faucet isn't always the same problem underneath
The drip you're dealing with can point to different root causes depending on exactly when and where it shows up — selecting your situation below will help you arrive at the right fix faster.
What a dripping faucet actually costs you if you leave it alone
A slow drip feels trivial — one drop every second or two, barely a trickle. But water doesn't charge you by drama; it charges you by volume. A faucet dripping at that rate adds up to roughly 3,000 gallons per year, which lands as a real and recurring addition to your water bill. More practically, that constant moisture contact accelerates staining and mineral buildup in your sink basin, and if any water is tracking down to the cabinet below — which happens more often than people realize — you're looking at the early conditions for wood rot and mold growth over a period of months.
The U.S. Environmental Protection Agency's WaterSense program estimates that a single dripping faucet — one drip per second — wastes more than 3,000 gallons per year. That's equivalent to over 180 showers. The replacement washer or cartridge that fixes most drips costs between $5 and $30 at a hardware store. Even hiring a plumber for a straightforward cartridge swap typically runs $100–$175 — a cost recovered quickly against the water waste alone, before accounting for any cabinet or sink damage below.
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What others have experienced
47 community experiences-
RK
I had a single-handle Moen that had been dripping for about four months — I kept meaning to deal with it. Finally pulled the cartridge and the rubber seal at the bottom was practically crumbling. Took a photo of the old cartridge to the hardware store, they matched it in about two minutes. The whole thing took me 45 minutes including watching a YouTube video for my specific model. Completely stopped. I feel like an idiot for waiting as long as I did.
31 found this helpful -
DM
Mine turned out to be the O-ring around the spout base rather than the internal cartridge — the drip was actually coming down inside the faucet body and pooling under the sink, which I only noticed when I opened the cabinet one day. I had assumed it was just a normal spout drip for months. Replacing the O-ring cost about $4 and fixed it, but I wish I'd caught it sooner because the shelf liner under the sink had started to get mildewy. Worth checking under there if your drip seems odd.
24 found this helpful -
TG
I tried replacing the washer myself on an older two-handle faucet and it helped but didn't fully stop it. Turns out the valve seat itself was corroded from years of hard water and no amount of new washers was going to seal properly against that surface. I ended up calling a plumber who resurfaced the valve seat with a seat wrench tool — not something I'd have known to do on my own. Cost me $140 but it's been bone dry since. Sometimes the problem is deeper than the obvious part.
19 found this helpful
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