Why does my toilet keep running after flushing?

A constantly running toilet is almost always caused by a faulty flapper valve, a float set too high, or a worn fill valve. Start by checking the flapper — if it does not seal flat against the drain seat, replace it. This is a $5-$10 fix that takes under 10 minutes.

How do I unclog a toilet without a plunger?

Pour one cup of dish soap and hot (not boiling) water into the bowl and wait 15 minutes. The soap lubricates the clog and the heat breaks it down. If that fails, a toilet auger will clear 95% of clogs without a plunger.

What is the best toilet brand in 2026?

TOTO leads for flush performance and longevity. Kohler is best for design variety. American Standard offers the best value under $300. The right brand depends on your rough-in measurement, bowl shape, and budget.

What is rough-in measurement for a toilet?

Rough-in is the distance from the wall behind your toilet to the center of the floor drain bolt holes. Standard US rough-in is 12 inches. Buying the wrong rough-in size is the number one installation mistake homeowners make.

Toilet Symptom Checker — Diagnose Your Problem Free

Toilet Symptom Checker — Diagnose Your Problem Free | ToiletsExpert

Describe what your toilet is doing and this tool diagnoses the exact problem in seconds — running toilet, phantom flush, base leak, weak flush, or strange noise. Each result includes step-by-step repair instructions, a parts list, DIY difficulty rating, and estimated plumber cost so you know exactly what you’re dealing with.

🔧 Free Diagnostic Tool

Toilet Symptom Checker

Describe what’s wrong — get an instant diagnosis & step-by-step fix in under 60 seconds.

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What’s happening with your toilet?

Select the symptom that best describes your problem.

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Frequently Asked Questions

A constantly running toilet is almost always caused by one of three things: a worn flapper that no longer seals, a faulty fill valve that won’t shut off, or a float set too high that lets water overflow into the overflow tube. The symptom checker above will identify which part is causing your specific issue and show you exactly how to fix it.

If your toilet is less than 15 years old and the repair costs less than $150, repair is almost always the better choice. Toilets over 20 years old using 3.5+ gallons per flush, or those with cracked porcelain, are strong candidates for replacement — a new WaterSense toilet can pay for itself in water savings within 2–4 years.

No — toilet problems never resolve on their own and almost always get worse. A small leak wastes 200+ gallons per day. A running toilet can add $50–$100/month to your water bill. Diagnosing the problem early with a symptom checker and fixing it promptly is always the right call.

Call a plumber if you see water on the floor around the base (possible flange or wax ring failure), if you have a slow-moving drain that backs up into other fixtures (indicating a main line clog), or if the tank cracks. Most internal toilet repairs — flappers, fill valves, flush valves — are straightforward DIY jobs that take 20–45 minutes with no special tools.