Toilet won't flush: 5 fixes from tank to sewer

What to do, in order

1. Lift the tank lid. Press the handle: if the chain is slack or disconnected, rehook it leaving ½ inch of slack.
2. If the flapper doesn't lift, the handle arm may be bent or the mount cracked — a $12 universal kit replaces both.
3. Weak swirl? Hold the tank lid up and check the water level — it should sit ½ inch below the overflow tube. Adjust the fill valve screw or float arm.
4. Clean the rim jet holes (under the toilet lip) with a mirror and a bent paper clip — hard water plugs them and kills the siphon.
5. Slow-draining bowl that clears eventually: plunge with a flange plunger 15–20 firm strokes. Still weak? Toilet-paper test: flush 4 sheets — they should go down clean.
6. Gurgling in the tub or shower when the toilet flushes = shared-line blockage: auger or pro.

Red flags — stop and call a pro

• Water rising to the rim and staying — shut the supply valve at the wall, then plunge
• Sewage backing up into a tub or shower — main line, stop using water, call now
• Tank cracked and weeping water — replace the toilet, don't patch
• Toilet runs non-stop AND the bowl level keeps dropping — flapper AND possible partial clog

Prevention

Avoid flushable wipes entirely, clean rim jets yearly with vinegar, and replace the flapper at the first sign of running — a $10 part that saves hundreds in ghost water bills.

This guide is maintained by the ee.ltd editorial team — reviewed for 2026. Browse all home repair guides or compare plumbing costs.

Related guides

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• Sudden low water pressure in the whole house: diagnosis
• Clogged drain: when to plunge, snake, or call a pro
• Toilet keeps running: the 3 parts to check

What this repair typically costs

• Water heater replacement cost guide
• Water heater repair cost guide
• Toilet installation cost guide
• Faucet replacement cost guide