How do I fix a running toilet?

asked June 14, 2026 in Plumbing · by Handyman Mod · Contractor

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Toilet keeps running long after flushing. What's usually the cause and how do I fix it myself?

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C
ContractorBest replyJune 18, 2026
32 helpful votes
A toilet that keeps running is usually the flapper (worn/warped) or the fill valve. Take the tank lid off and watch: if water trickles into the bowl, replace the flapper; if it keeps filling, adjust or replace the fill valve and check the float height. Both are cheap parts and a 15–20 minute fix. If the tank cracks or the shutoff leaks, call a plumber.

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