Shower Head Leaking or Dripping? Cartridge vs Washer Fixes
The fix depends entirely on when and where it leaks. A drip from the head after the water is off is the valve cartridge wearing out, not the head itself: a head swap will not stop it. A leak where the head meets the arm is threads or a washer, fixed with tape for a few dollars. A diverter that leaks is its own part. Here is how to read it.
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- !Water is leaking behind the wall, not just from the head: a stain, soft spot, or musty smell on the wall or ceiling below means a concealed leak
- !The shower arm or valve feels loose in the wall and water seeps around it: the connection inside the wall may be failing
- !Hot water sprays or the valve handle spins freely without controlling temperature: shut off the water and avoid scalding
- !Mold spreading on the wall or ceiling below the shower from a long-running hidden leak
- !You shut the main supply and the drip continues from somewhere behind the wall
- ✓Time the drip: water dripping from the head only while showering points to the head or arm connection, while dripping that continues after you shut the water off points to the valve cartridge inside the wall
- ✓Check the connection where the head screws onto the shower arm: a leak there is usually worn thread tape, retightened with fresh PTFE (plumber's) tape
- ✓Unscrew the head and inspect the small rubber washer inside it: a flattened or cracked washer is a few-cent fix
- ✓Soak a mineral-clogged head in white vinegar overnight: a head that sprays sideways or dribbles unevenly is usually limescale, not a leak
- ✓For a tub-shower, check the diverter (the pull-up tab on the spout or a third handle): water running from the tub spout while showering is a worn diverter, not the head
- →The head drips for minutes or constantly after you turn the water off: the valve cartridge is worn and needs replacement inside the wall
- →You replaced the cartridge and it still drips, or the cartridge is seized and will not come out: corroded valve internals need a plumber
- →A leak you can see staining the wall or ceiling, meaning water is escaping behind the tile
- →The diverter or valve body itself leaks rather than a threaded connection
- →Multiple fixtures drip or the shower temperature is hard to control, pointing at valve or pressure issues
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Drip after the water is off: it is the cartridge
This is the most misdiagnosed shower leak. When the head keeps dripping for minutes, or constantly, after you have shut the shower off, people blame the head and swap it, and the drip continues. The head is just the end of the pipe; the part that actually stops the water is the valve cartridge inside the wall behind the handle. When that cartridge wears, it no longer seals fully, so a trickle of water keeps passing through and emerges at the open end, the head, as a drip.
So a post-shutoff drip is a cartridge job, not a head job, and no amount of tightening or replacing the head will fix it. The cartridge is accessed by pulling the shower handle and trim, and replacing it restores a clean shutoff. Cartridges are brand and model specific, which is the main reason this leans toward a plumber: matching the exact cartridge and freeing a corroded one are where the job goes sideways.
Leak at the connection: threads and washers
A leak that appears only while the water is running, dripping or spraying from where the head screws onto the shower arm, is a connection problem, and it is the easy one. The threaded joint relies on PTFE tape (plumber's tape) and a small rubber washer inside the head to seal. Over time the tape degrades and the washer flattens, and water weeps from the joint.
The fix is genuinely a few minutes and a few dollars. Unscrew the head, peel off the old tape from the shower arm threads, wrap three or four turns of fresh PTFE tape clockwise around them, check or replace the rubber washer inside the head, and screw it back on hand-tight plus a gentle nudge with a wrench. That stops the great majority of connection leaks. While the head is off, soaking it in white vinegar clears the limescale that makes an old head spray sideways, which people often mistake for a leak.
Diverters and the tub-spout tell
On a tub-shower combo, a third leak point hides in plain sight: the diverter. That is the pull-up tab on the tub spout, or a separate diverter handle, that routes water up to the shower head. When it wears, it no longer fully blocks the path to the spout, so while you shower a steady stream keeps running out of the tub spout below, and the head loses pressure. That is not a head or cartridge leak; it is the diverter, and the fix is a new spout (for pull-tab types) or a diverter rebuild.
Reading the symptom keeps you from replacing the wrong part. Water from the tub spout during a shower is the diverter. A drip from the head after shutoff is the cartridge. A weep at the head-to-arm joint while running is the connection. Each is a different part, and matching the symptom to the part is the whole game before anyone quotes you, the same way the location of a toilet leak decides whether you are facing a washer or a whole fixture.
What each fix costs
A connection leak sits at the bottom of the range: PTFE tape and a washer are a couple of dollars, so the real cost is your ten minutes. If you would rather have a pro do it, or are also swapping in a new shower head, expect $100 – $200 for a head swap with the connection resealed, against essentially $0 – $50 in parts if you handle it yourself.
A worn valve cartridge, the cause of the after-shutoff drip, runs $100 – $350 with a plumber, depending on whether the cartridge pulls out cleanly or is corroded into a seized valve. That range and what pushes it higher (a full valve body replacement when the cartridge is unavailable or the valve is shot) are detailed in our shower valve replacement pricing. A diverter fix is in between: a new tub spout is inexpensive, while a built-in diverter rebuild approaches cartridge territory.
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