Shower won't drain: Causes and Fixes | N-Sink Plumbing

Ty Malagarie

Most Shower Clogs Are Sitting Right Under the Cover

Why won't my shower drain?

A shower that drains slowly is almost always blocked by a mat of hair bound together with soap scum sitting in the drain body, within a few inches of the opening you can see. What keeps it from getting fixed is usually the cover, not the clog. Most stall strainers come out with one or two center screws or a gentle pry at the edge, and once that cover is off the mat can generally be pulled out with needle nose pliers. If water still stands after the visible hair is gone, the blockage sits deeper in the trap or the branch line, and that needs a hand auger rather than fingers or another bottle of cleaner.

Why this happens in Southeast Texas

Two regional things show up in shower drains specifically. The first is the water. Golden Triangle supply is hard enough that soap scum forms readily, so a shower here rebuilds a mat faster than the same shower would somewhere with softer water, and it does that again after every cleaning. That is a maintenance rhythm, not a defect. The second is what settled into low fixtures after Hurricane Harvey in 2017 and Tropical Storm Imelda in 2019. Tubs and shower pans sit lower than anything else in a house, so in homes that took water, fine silt washed into those traps and a fair amount of it stayed. If a shower anywhere across Jefferson, Orange or Hardin counties has drained poorly ever since one of those storms, and pulling hair out changes nothing, the trap itself is worth looking into rather than the strainer above it.

Getting the Cover Off Is the Part That Stops Most People

There are three assemblies you are likely to be looking at. A screw-down strainer has one or two visible screws in the center and lifts straight out once they are removed. A snap-in or press-fit strainer has no screws at all and comes up with a flathead worked gently under the rim, ideally with a strip of tape on the blade so you do not chip the finish. A lift-and-turn or toe-touch stopper in a tub unthreads counterclockwise while you hold the base still, and some hide a small set screw under the cap on top. Two practical notes. Strainer screws are small, they sit directly over an open drain, and they corrode into place in a wet fixture, so give a stuck one a few minutes with penetrating oil rather than rounding the head off. And once the cover is out, put a rag in the opening while you work so nothing you drop goes somewhere a plumber has to retrieve it from.

Hair Is the Frame, Soap Scum Is What Makes It Solid

Loose hair on its own would mostly wash through. What turns it into a mat that holds its shape is soap scum, and that is a direct product of the water in this region. Municipal supply across the Golden Triangle is hard, meaning it carries a lot of dissolved calcium and magnesium, and those minerals react with soap to leave a sticky residue instead of rinsing away cleanly. That residue coats the hair and glues the whole thing to the crossbars of the drain body. This is also why drain cleaner so often disappoints on a shower. Those products are formulated to attack grease and organic soil. A hair mat locked together with mineral-bound soap residue is a mechanical problem, and it needs to come out mechanically. It is worth knowing before you buy the second bottle, because the first one already told you what you are dealing with.

Tub Showers Have a Second Clog Point a Stall Doesn't

If your shower is over a tub, there is a whole assembly a stall shower does not have. The overflow plate on the wall end of the tub connects to a linkage running down inside the overflow tube, ending in either a plunger that seats in the drain tee or a pop-up stopper at the drain opening. Hair wraps around that linkage and collects on it, and none of it is visible from the drain opening you can see. So a tub that drains slowly while its drain opening looks perfectly clear is often clogged at the stopper assembly rather than anywhere in the pipe. Two screws hold the overflow plate on, and drawing the linkage up and out through the overflow tube usually brings the mat with it. One caution if you do that: there is a gasket behind that plate, and it has to seat properly when the plate goes back on. A tub overflow that leaks does it behind the wall, into the framing or the ceiling below, and you will not see it until there is a stain.

When the Water Standing in Your Shower Is Not the Shower's Fault

A shower or tub drain usually sits at the lowest point in a house's drain system, closer to floor level than any sink. That position makes it the first place a problem further downstream shows itself, which means some shower backups have nothing to do with hair at all. The tells are specific. If the shower rises when the washing machine drains, if the toilet next to it bubbles while the shower runs, or if the water coming up is dark or smells like sewage, the restriction is in a line shared with other fixtures and the drain cover is not where the answer is. Local conditions make that worth ruling out here. Gulf Coast clay soil and slab-on-grade construction put the branch line under concrete across Jefferson and Orange counties, and a water table this close to the surface means older sewer lines take on groundwater and the root intrusion that follows it. A main line narrowed that way announces itself at the lowest fixture in the house first, and that fixture is almost always a shower or a tub.

Shower won't drain

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Frequently Asked Questions

The drain cover in my shower has no screws. How is it supposed to come out?

It is a snap-in or press-fit strainer, and it lifts out with a flathead screwdriver worked gently under the rim. Put a strip of tape on the blade first so you do not chip the finish around the drain, and work around the edge rather than levering hard in one spot. A few designs twist a quarter turn instead of prying, so try rotating it before you force anything.

I pulled out a lot of hair and it still drains slowly. What now?

What you removed was the top of the mat. The rest is usually sitting in the trap just below the drain body, past where you can reach by hand. A hand auger fed down the open drain will normally reach the trap and the first few feet beyond it. If that does not restore normal flow, the blockage is deeper than the tools that fit through a shower drain can get to.

Is it safe to pour boiling water down a shower drain?

It is not the harmless trick it is usually presented as, and it does not work on this kind of clog anyway. PVC drain pipe is not rated for sustained temperatures near boiling, and the glued joints soften before the pipe does. Hot tap water is fine. Either way, boiling water does not dissolve a hair mat held together by mineral-bound soap residue, so it is heat with nothing to show for it.

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Ty Malagarie, Owner

N-Sink Plumbing and Drain Specialist · Est. 2026

Licensed PlumberFully Insured

Updated October 2026