Showers leak in five places, and only three of them are a plumber's territory. The tile, grout and pan belong to a different trade, while the valve, the drain and the lines hidden in the wall count as plumbing. Sorting which is which saves you from paying twice. Below is a way to trace the source, the repairs that follow, and a short detour into disposal installation for the same sink-and-shower crowd. Our sink and disposal plumbing page covers the kitchen side.
Where does a shower leak actually start?
Look first at five locations, since nearly every leak begins in one: the showerhead or arm connection, the valve trim and handle, the supply pipes inside the wall, the drain connection under the floor, and the pan or waterproofing beneath the tile. Water at the head or handle is visible. Hidden sources announce themselves through a ceiling stain below or drywall softened next to the shower.
Clues help. A drip while the shower is off means a valve or cartridge. A leak only while it runs points to the pan, the drain or the head. Water on the floor after a long shower but not a short one suggests grout, caulk or the curb. A sudden gush behind the wall is a burst supply pipe, and that is an emergency: shut the main immediately and call.
How can I find the source before anyone opens a wall?
Isolate each part in turn. Run the tub spout only, with the shower diverted off, and watch the valve area. Then run the showerhead only. After that, stopper the drain, let a few inches of water stand in the base for several hours to expose pan and drain leaks, then empty it and inspect the ceiling or wall beneath for any change.
Photograph each result with the time. Look under the shower from the basement or crawl space if there is one, since a dripping pipe can sit right there. Moisture meters and thermal cameras, brought by a plumber or a detection company, reveal damp patches without demolition.
Which jobs are for a plumber and which are for a tile or waterproofing pro?
A plumber handles the valve, cartridge, trim, supply pipes, drain connection and showerhead plumbing. A tile or waterproofing contractor handles failed grout, cracked tile, the pan liner and curb. Caulk and showerhead tape are fair do-it-yourself jobs. The plumber's state classification covers piping, fixtures and water heaters, and it makes sense to ask which trade a quote assumes.
A leaking pan usually means pulling up tile, which brings in the tile pro after the plumber finishes. Mold is a concern wherever the wall stayed damp. The EPA says to fix plumbing leaks promptly and dry materials fully, and that soaked porous material can be a write-off, so do not tile over wet drywall.
Why do shower pipes burst, and what is the response?
Usually age, corrosion, a failed fitting or a pipe that was stressed during earlier work. Freeze damage is uncommon on this coast. A burst line behind a shower wall floods quickly, so shut the main valve, open a lower faucet to relieve pressure, stay away from wet outlets and phone for help. Pictures of the damage will matter for insurance.
Repair means opening the wall at the pipe, swapping the failed section and testing before the wall closes. In Belmont Shore, Bixby Knolls and similar neighborhoods, houses dating from 1920 to 1959 may carry galvanized pipe that fails in several spots, so the plumber might propose replacing the whole run. For the broader picture, read about leak repair.
What if the tub is weak while every other fixture is strong?
Local causes dominate. The tub spout's diverter can fail, so water never fully reaches the shower or tub as expected. A showerhead clogged with scale restricts flow. A cartridge in the shower valve can be blocked with debris, and a stop valve inside the access panel could be left half closed. Pressure elsewhere in the house confirms the supply is fine.
Start with the cheap items. Clean or replace the showerhead and see whether flow returns. Try the tub spout alone. If it is still weak, the cartridge or valve body is the next suspect, which is a plumber's repair. Our guides to low shower pressure and weak flow at the faucet give more detail.
Does fixing a shower leak need a permit?
It depends on the scope. Long Beach requires a plumbing permit when fixtures or piping are installed, altered, repaired or replaced, but exempts leak stoppage and minor repairs that use no new materials and faucet repairs using approved types. Replacing a shower valve or supply piping usually falls on the permit side.
Raise it at the quote stage, plus who applies for the permit. Contractor licensing becomes mandatory at $1,000 in California, and a written contract at $500. Our page on a faucet leak in the tub covers the small repairs that usually do not.
Is a Badger 500 or similar disposal a do-it-yourself install?
You can, within limits, and Long Beach says a permit is not required to replace a garbage disposal. The maker's steps run in a set order: power off, mount the assembly under the sink flange, connect the drain, knock out the dishwasher plug if the dishwasher drains into it, and handle the electrical connection last.
Brands such as InSinkErator, American Standard, Glacier Bay and Moen follow the same pattern, with differences in the mounting ring. The electrical part is where people get hurt, so if the unit is hard-wired or the outlet is under the sink and unfamiliar, hire a pro. Our page on disposal installation covers service options.
What about sink plumbing in a mobile home?
Mobile home sinks use the same kinds of parts, with the drain often venting through an air admittance valve instead of a roof stack, and supply lines running under the floor. Drips beneath the sink usually trace to a trap, a hose or a stop valve. For permits on bigger work, state housing rules apply, and our page on winterizing mobile home plumbing explains who to ask.
Common questions
How long should a shower repair take?
A cartridge or showerhead swap is under an hour. A valve replacement or a repaired supply pipe usually takes a few hours plus wall repair. Pan problems take longer, since tile has to be removed and replaced and waterproofing has to cure. Expect a schedule from the plumber, plus a note on which parts fall to another trade.
Which questions belong in the first conversation?
Find out how the source gets confirmed, which trades take part, whether opening and closing the wall and a permit are in the quote, and the license number. Learn the plan if another leak turns up. A written estimate that lists exclusions protects you better than any verbal promise.
Will insurance cover a shower leak?
A sudden burst that damages floors and walls is often covered for the damage, while a slow seep through worn grout or seals often is not, though policies differ. The repair of the fixture itself is usually the owner's cost. Notify the insurer early, keep photos and the plumber's written finding, and ask in writing.
The rest of our guides start from plumber in Long Beach.
References
- City of Long Beach, plumbing permit requirements and exemptions
- City of Long Beach, permit questions (garbage disposal replacement)
- InSinkErator support, Installing a Replacement Garbage Disposal
- U.S. EPA, mold cleanup in your home
- CSLB, C-36 Plumbing Contractor classification
- California Contractors State License Board, home improvement contracts
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