Short answer: Nine times out of ten, a slow or standing-water shower is hair tangled with soap scum just below the drain cover. Remove the cover, pull the hair out with a plastic drain tool or a bent wire, and flush with hot water. If the shower drains slowly with no hair, or the toilet and other drains are slow too, the clog is further down.
Quick diagnosis
| What you notice | Most likely cause | What to check | Call a pro? |
|---|---|---|---|
| Water pools during a shower, drains after | Hair and soap near the drain | Remove the cover and look | Rarely |
| Standing water that will not drain | Hair mat or object in the trap | Plunge with the overflow (tub) covered | If it will not clear |
| Slow but no hair visible | Soap scum and buildup in the trap | Hand snake into the trap | Sometimes |
| Shower and toilet both slow or gurgling | Branch or main line clog | Check other drains | Yes |
| Clog came back right after Drano | Chemical softened but did not remove the mat | Use a mechanical tool | If it persists |
How to clear a shower drain
- Remove the drain cover (pop-out, twist-off or two screws).
- Use a plastic barbed drain tool or a bent wire hanger to pull out hair.
- Run hot water for a minute.
- If it is still slow, plunge: fill a little water, seal the plunger over the drain and, for tubs, cover the overflow plate with a wet rag.
- Still slow? A small hand snake can reach the trap.
Why it keeps clogging
Long hair and bar soap combine into a sticky mat. A hair catcher over the drain is the cheapest prevention, and cleaning it weekly keeps the trap clear. Repeated chemical cleaners can damage older pipes and are dangerous if they splash back during plunging.
When to call a professional
- Water backs up into the shower when you flush the toilet or run the washer.
- More than one fixture is slow.
- You cannot remove the drain cover or the pipe is damaged.
What it usually costs
Clearing a drain typically costs about $100 to $275 with a plumber, according to HomeGuide (2026). A plastic drain tool or a hair catcher costs a few dollars.
Frequently asked questions
Why does my shower drain slowly even with no hair?
Soap scum and mineral buildup can narrow the trap, or the clog is further down the branch line.
Why does water come up in my shower when I flush?
The toilet and shower share a drain line further down. Water backing up into the shower points to a clog in that shared line or in the main sewer line.
Related problems
- Kitchen sink clogged
- Clog deep in the drain pipe
- Sewer smell in the bathroom
- Toilet won’t flush all the way
Sources
This guide is general information, not a substitute for an inspection by a licensed professional. See our disclaimer.