Same drain keeps clogging over and over

Symptoms

• One specific sink, tub, or shower clogs again every few weeks
• Other drains in the house are not affected
• Clearing it provides only temporary relief
• Clog composition is similar each time (hair, grease, etc.)

Likely causes

• CommonOngoing habit feeding the clog (hair, grease, food scraps)If the same type of debris keeps entering the drain, the same type of clog will keep forming.
• CommonMissing or ineffective drain screen/catcherWithout a screen, debris that should be caught goes straight into the pipe.
• PossibleLow pipe slope or a sagging section trapping debris at that fixture's lineA structural issue specific to that fixture's drain run.
• Less commonUndersized pipe for that fixture's useOccasionally an older or modified plumbing run is simply too narrow.

What to do

1. Identify what's most likely causing the clog based on the fixture (hair for showers/tubs, grease/food for kitchen sinks, soap scum for bathroom sinks).
2. Add or replace a drain screen or hair catcher appropriate to that fixture if one isn't already in use.
3. Adjust habits accordingly: dispose of grease in the trash, brush out hair before showering, or scrape plates before washing.
4. Do a more thorough cleaning than usual, including removing and cleaning the P-trap, to fully clear existing buildup rather than just the surface clog.
5. Set a recurring light maintenance routine, like a monthly hot water and baking soda/vinegar flush, for that specific drain.
6. If recurrence continues despite behavior changes and screens, ask a plumber to check that fixture's specific drain line for a slope or pipe sizing issue.

Tools and parts

• Adjustable pliers
• Baking soda
• Vinegar

When to call a pro

Call a plumber if the same drain keeps clogging despite screens and better habits, since there may be a slope or pipe sizing issue specific to that line.

Safety