Why does my shower keep clogging?

Hair is the frame of a shower clog, and soap scum is the glue. Strands slip past the strainer, wrap around the first rough spot in the pipe, and collect there. The USGS explains that in hard water, soap reacts with calcium to form soap scum. That scum is the sticky layer hair grabs onto, and it explains why a drain with a strainer still clogs: the strainer stops the big pieces, but fine hair and scum pass through and stick below.

Body oils, conditioner, shaving residue and skin flakes add to it. Left alone, the mix turns into a dense mat that holds water back a little more each week. You will see the water pool around your feet for longer after each shower, or hear a slow gurgle as the last of it goes down. That is the point to act, while the mat is still soft and near the top. If the mat also grows slime or smells musty, black slime in drains covers that, and a sewer smell has its own page on bathroom drain odors.

Long hair, pets bathed in the shower and heavy conditioner use make the plug form faster. A household with several long-haired people will clog a shower drain sooner than a single short-haired person will. Nothing is wrong with the pipe in either case. The difference is how much hair reaches the trap.

Phoenix tap water is hard, so scum and scale form quicker here than in soft-water cities. The City of Phoenix 2025 water quality report lists total hardness of 172 to 302 parts per million, or 10 to 17.6 grains per gallon. USGS classifies more than 180 mg/L as very hard. The city's reported range spans hard and very hard water; it does not establish a clog rate or an address-specific measurement. The city adds that "Hard water can cause some types of scaling in pipes and water heaters," and it names faucets and showerheads as fixtures that scale too.

Scale narrows the drain and roughens the pipe wall, and rough walls catch hair. The city notes hardness is an aesthetic matter, not a health one, but for a drain it means less room and more snags. You can see the same process on the shower itself, as white crust around the strainer and on the showerhead. Deposits on a showerhead show mineral buildup at that fixture; they do not prove the condition inside the drain. Scale on the showerhead is a separate fix, covered in how to clean a clogged showerhead.

A softener can reduce hardness-related deposits. It does not remove an existing hair mat or repair a drainage defect. Whether one is worth it for your home depends on the whole house, and water softeners and Arizona hard water goes through that. Our page on how hard water damages plumbing covers what else it touches. Until then, a catcher and a routine do most of the work.

Most hair stops in two places: the strainer at the top and the P-trap below the floor. The trap is a U-shaped bend that holds water to block sewer gas, and its low curve is where a mat settles. See what a P-trap is if the term is new. Because water sits in the bend, the mat stays wet, and wet hair and scum bind tighter than dry.

Strainer design matters more than people expect. A wide, flat strainer with big openings lets long hair through. A fine mesh or a raised hair catcher stops it where you can reach it. Tub-shower combinations often have a pop-up stopper or a trip lever inside the overflow, and hair wraps around those parts before it ever reaches the trap. A walk-in shower may have a flat cover over a drain body, or a long linear drain along one wall, and either one can be lifted out for cleaning. Look for a way to lift the cover with a screwdriver or your fingers.

The catcher only works if you empty it. A full catcher blocks the drain itself. Check it after each shower, since that takes a few seconds, and lift it out for a proper rinse weekly. A catcher that never gets emptied is the reason some households conclude catchers do not work.

Clear the strainer end first, since most plugs sit within reach. Before you start, do a quick test: plug the drain and let an inch or two of water stand, then time how long it takes to drain. Write it down. You will use it to check your work.

1. 1Unscrew or lift out the strainer or cover. Wear gloves.
2. 2Pull out the visible hair by hand.
3. 3Feed a barbed plastic drain tool straight down, twist, and pull it back slowly. Repeat until it comes up clean.
4. 4Run hot tap water for a minute and watch how it drains.
5. 5Put the strainer back and fit a fine hair catcher.

Clean the removable strainer and accessible opening with a method approved for their materials. Do not assume an acid cleaner is compatible with every metal finish, seal or drain assembly. Skip caustic drain cleaners, which can burn skin if they splash back from a pan of standing water. Enzyme products act slowly, and do enzyme drain cleaners work explains where they fit.

Retest with the same amount of water. If it drains as fast as it did when the house was new, you are done. If it still lags, the mat is deeper in the trap or past it. Do not force a stiff cable or a hard plastic tool down a shower drain. It can scratch or crack the trap, and a cracked trap under a floor is a bigger job than the clog was. If the tool stops against something solid, stop and move to the next section. For the wider pattern, see why the same drain keeps clogging.

Call a plumber when the tool stops against something solid, or when the clog is not really in the shower. EPA lists blockages among the possible causes of sewer overflows, and a blocked line shows up first at the lowest fixture in the house, often the shower. Watch for these signs:

• Water rises in the shower when you flush a toilet or run the washer.
• Sinks and toilets gurgle or drain slowly at the same time.
• A sewer smell comes up from the shower drain.
• The shower clogs again within days of a clean clearing, with the strainer in place.

The first three point to the branch or main line, and water backing up in the shower when you flush explains why. The last one points to something in the trap or pipe that hand tools are missing: a rough patch of scale, a low spot, or a fitting that catches hair. A licensed plumber can clear the line with a cable and camera, and find a belly or roots that a hand tool cannot reach. Shower drains on a concrete slab are also harder to reach than a sink trap since the pipe sits below the floor. A camera shows whether the pipe needs cleaning or repair, so the plan is clear before work starts. HQ Plumbing & Air offers 24/7 emergency service, gives upfront pricing and free estimates, and is licensed and insured.