Two different problems wear the same disguise here, and telling them apart saves you from fixing the wrong one. When you turn a shower off, the water standing in the riser pipe and the head itself has to go somewhere, so a healthy shower often dribbles for a minute or two, sighs, and stops. That's drainage. A leak is different: it drips at a steady or intermittent pace ten minutes later, an hour later, all night. That water is sneaking past the valve that is supposed to be shut tight. Below is how to confirm which one you have, and then how to fix the valve yourself.
Watch the clock, not just the drip. If it stops within about ten minutes of every shower, you're looking at drainage — annoying echo in a tile stall, but nothing is broken. If it never fully stops, do the swap test: unscrew the shower head (most are hand-tight; wrap a rag around the nut and use pliers only if you must). Now watch the bare pipe stub. Still dripping? The valve is the culprit, full stop. Stopped? Then the head or its hose was just holding water — common with handhelds, where the hose loop stores a surprising amount.
One more look while you're at it: on a tub-shower combo, a worn tub spout diverter can confuse the picture, and a drip at the spout is its own washer problem. Know which fixture is actually leaking before you open anything up.
| Drip pattern | Most likely cause |
|---|---|
| Drips for a few minutes after shutoff, then stops | Normal drainage from the pipe and head |
| Drips steadily or off and on, forever | Worn cartridge or stem washer at the valve |
| Water weeps at the connection nut, not the face | Failed washer in the swivel nut, or old Teflon tape |
| Weak, sideways spray with white crust on the holes | Mineral buildup inside the head |
Shut the water off. Some showers have fixture shutoffs behind an access panel; most don't, so plan on closing the house main and opening a low faucet to drain pressure. Skip this and step 4 becomes a fountain.
Remove the handle and trim. The set screw usually hides under a cap or on the underside of the handle — hex key out, handle off. Unscrew the trim plate (escutcheon) and set the screws somewhere they can't roll into the drain. Speaking of which: plug the drain or lay a towel over it now. Small screws find drains like they owe them money.
Pull the cartridge (or stems). Take a phone photo before you touch anything — orientation matters on reassembly. Single-handle valves use a cartridge, often held by a retaining clip you pull up and out; the cartridge then slides or twists free. Some cartridges are stubborn enough to need an inexpensive puller tool made for the brand. Two-handle showers use stems instead: unscrew the stem and you'll find the washer at its end, held by a small screw.
Match the part, then swap. Cartridges are brand- and model-specific — take the old one to the store and match it in person rather than guessing from a photo online. On stem valves, replace the washer, and run a fingernail over the brass seat it presses against inside the valve body; if it's nicked or rough, that's why washers keep dying, and the seat needs resurfacing or replacing too. Smear silicone grease on new O-rings before sliding a cartridge home.
Reassemble and test honestly. Put it back in the order it came apart, turn the water on slowly, and run the shower. Then shut it off and give it a full ten minutes before you declare victory — a slow valve leak can take a while to show its first drip. Dry around the valve area and check for any seepage at the trim while you're there.
When the swap test cleared the valve, the head gets its turn. A weep at the connection nut usually just needs the washer inside the nut replaced and fresh Teflon tape — two or three wraps, clockwise as you face the threads — then hand-tight plus about a quarter turn. Don't crank it; plastic threads crack. A head clogged with mineral crust, spraying sideways and dribbling because water pools in it, wants a descaling soak: bag it or unscrew it into a bowl of vinegar overnight. If you're replacing the head outright anyway, our guide to how to replace a showerhead covers picking and fitting one, and the same minerals that crust a shower head clog faucet aerators too — the faucet aerator cleaning walkthrough is a five-minute job. While the bathroom is in project mode, a shower that's been dripping warm and damp is prime caulk-mold territory; getting mold off shower caulk is the matching cleanup. That same mineral crust, by the way, is the most common cause of low water pressure in the shower only — a weak spray and a dribbly head usually trace back to the same soak.
Replacing the shower head for a valve problem. The single most common wasted purchase in this whole category. A brand-new head on a leaking valve drips exactly like the old one, because the water is getting past the valve, not the head.
Guessing the cartridge from memory. Cartridges that look identical can differ in length, stops, and port layout. Bring the old one. Every time.
Cranking on the cartridge or the head nut. Brass and plastic valve parts split under enthusiasm. Snug, aligned, and leak-tested beats tight.
Bottom line: Give the drip ten minutes before you judge it — drainage is innocent. If it's still going, the valve isn't sealing, and a matched cartridge or a two-dollar washer, swapped with the water off and the drain plugged, fixes the great majority of them in under an hour. Sink faucets drip for the same reason — a tired washer doing the sealing — and the dripping faucet easy fix is the ten-minute version of this job at the sink.
For the first few minutes, it's the water left in the pipe and head draining out — normal, especially with large rain-style heads and handheld hoses. If the drip continues beyond about ten minutes, the shower valve's cartridge or washer has worn and is letting water slip past while shut.
More than it looks like. A drip every few seconds adds up to hundreds of gallons a year; a fast drip, one a second or so, can pass a few thousand. Beyond the waste, the constant moisture feeds mold in grout and caulk, which is reason enough to fix it.
No — and don't try. The valve work requires the water off, at the fixture shutoff if your shower has one, otherwise at the house main. Removing a cartridge on a live line will flood the bathroom and possibly the wall cavity.
For most single-handle valves, yes: handle off, clip out, cartridge swapped, about an hour for a first-timer with the right replacement in hand. Call a plumber if the cartridge refuses to budge, the valve body is corroded, or your shower's plumbing is old enough that parts crumble when touched.
Usually debris. Sediment from the water heater or scale flakes can lodge in a fresh cartridge and hold it slightly open. Flushing the valve body with the cartridge out, before installing the new one, prevents most repeat drips. If it's not debris, check that the cartridge is the exact match and fully seated.