Direct answer: If your bathtub is not draining, the most common cause is a clog of hair and soap scum at the drain opening or just below the stopper. A stuck stopper or trip lever can also keep water in the tub even when the pipe itself is mostly clear.
Most likely: Start by figuring out whether the stopper is physically blocking the drain or whether water is trying to drain but moving very slowly. That split tells you whether to clean the drain opening, adjust the stopper branch, or suspect a deeper clog in the tub drain line.
Most bathtub drain problems are visible and local, so begin with simple checks at the tub itself. If the tub also backs up when nearby fixtures run, or if repeated clearing only helps briefly, the problem may be farther down the branch drain and not a bathtub part.
Don’t start with: Do not start with harsh chemical drain cleaners, forceful plunging on an unknown stopper setup, or buying a new bathtub drain assembly before you know which branch you have.
The tub stays full or only drops a little over several minutes, even with the stopper set to open.
Start here: Start by confirming the stopper is actually lifting clear of the drain, then remove visible hair and debris at the opening.
Water eventually goes down, but you are standing in several inches of water during a shower.
Start here: This usually points to a partial clog near the drain opening or in the trap area, so begin with manual cleaning before assuming a deeper blockage.
The lever feels loose, jammed, or does not change how the drain behaves.
Start here: Treat this as a stopper-control branch first, because a bathtub can seem clogged when the stopper linkage is not opening fully.
Water rises in the tub when a sink, toilet, or washer drains nearby, or the tub gurgles even when you are not using it.
Start here: This points away from the bathtub assembly and toward a branch drain or main drain problem, so do only basic checks at the tub before escalating.
This is the most common reason a bathtub drains slowly or not at all, especially when the problem developed gradually.
Quick check: Remove the stopper if your setup allows it and look for a mat of hair or sludge just under the drain cover area.
A lift-and-turn, toe-touch, push-pull, or trip-lever style stopper can stay partly closed and mimic a clog.
Quick check: With the stopper set to open, see whether the opening is actually clear enough for water to pass freely.
If the drain opening is fairly clean but the tub still drains slowly, buildup may be farther down the line.
Quick check: Notice whether manual cleaning helps only a little, or whether the tub gurgles and then drains in surges.
If the tub backs up when other fixtures drain, the blockage is often beyond the bathtub itself.
Quick check: Run a nearby sink briefly and watch whether the tub water level changes or the drain makes bubbling sounds.
A bathtub can look completely clogged when the stopper is still blocking the opening. This is the fastest branch to rule out before you start clearing the drain.
If it works: If the tub drains normally once the stopper is fully open or removed, the main problem is the bathtub stopper or its adjustment, not a pipe blockage.
If it doesn’t: If the drain opening is fully clear and water still drains slowly or not at all, move to manual clog removal.
What that means: This step separates a bathtub drain control problem from an actual obstruction in the drain path.
The safest and most effective first fix is often simple manual cleaning right at the top of the bathtub drain, where hair and soap collect.
If it works: If the tub now drains at a normal speed, the clog was local to the bathtub drain opening and no replacement part is needed.
If it doesn’t: If only a little debris came out or the tub still drains poorly, the clog is likely farther down the bathtub drain path.
What that means: A local clog is the most common branch. If cleaning the opening does not change much, the blockage is probably below what you can see.
When the clog is just below the opening, a simple mechanical method is safer for the tub, drain parts, and your skin than pouring in chemical cleaners.
If it works: If the tub begins draining steadily, you likely cleared a soft clog in the upper section of the bathtub drain.
If it doesn’t: If the tool comes back mostly clean, or the tub still drains slowly after several careful passes, suspect a deeper branch clog or a stopper-linkage issue you cannot reach from above.
What that means: A clog that resists basic manual clearing is often deeper than the visible drain opening, or the tub has a mechanical stopper problem that still needs correction.
A bathtub-specific clog and a bathroom branch drain clog can look similar at first, but the next step is different. You do not want to replace bathtub parts when the line farther downstream is blocked.
If it works: If you confirm the problem is limited to the bathtub only, you can stay focused on the bathtub drain and stopper branches.
If it doesn’t: If other fixtures affect the tub, or more than one drain is slow, the blockage is likely beyond the bathtub assembly and may need a larger drain-clearing approach or a plumber.
What that means: This step keeps you from misdiagnosing a shared drain blockage as a bathtub part failure.
Only after cleaning and branch checks should you consider replacing a bathtub part. Most no-drain complaints are clogs, not failed hardware.
If it works: If one specific bathtub part is clearly damaged or no longer operates correctly, replacing that confirmed part is reasonable.
If it doesn’t: If no bathtub part is clearly at fault, the remaining likely cause is a deeper drain blockage rather than a bathtub hardware failure.
What that means: This final step prevents guess-and-buy mistakes. Replace bathtub parts only when the failure is visible and repeatable.
Only use these links after your checks point to the part that actually failed.
Buy only if the stopper is damaged, missing pieces, or will not open fully even after cleaning and correct adjustment.
Buy only if the overflow plate or its built-in control is cracked, stripped, or no longer operates the stopper correctly.
Buy only if the bathtub drain flange or drain body is corroded, loose, or leaking and you have confirmed the problem is not just a clog.
Buy only if you separately confirmed a bathtub faucet drip is contributing water to the tub and making it seem like the tub is not fully draining.
That usually means the clog is local to the bathtub drain or stopper area. Hair and soap buildup near the tub opening are much more common than a whole-bathroom blockage when the sink still drains normally.
Yes. If the stopper does not lift high enough, stays partly closed, or the trip lever linkage is misadjusted, water may drain very slowly even when the pipe itself is not badly blocked.
It is usually better to start with manual cleaning and a simple drain tool. Chemical cleaners can be harsh on finishes and drain parts, create handling hazards, and do not solve a stuck stopper problem.
That points to a blockage farther down the shared branch drain, not just at the bathtub. In that case, replacing bathtub parts will not fix the real problem.
Replace a bathtub part only when you have confirmed visible damage or a repeatable hardware failure, such as a stopper that will not open fully, a broken overflow control, or a leaking, corroded bathtub drain assembly.